板凳——————————————————(昏鸦)Introduction to Java Programming

//Introduction to Java Programming

//p30/603 2021年03月21日星期日 13时46分12秒
import javax.swing.JOptionPane;
import java.util.Scanner;

public class hello{
/* public static void main(String[] args){
System.out.println(“Welcome to Java!”);
}
wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java hello
Welcome to Java!
/
public static void main(String[] args){
//Welcome1.java 2021年03月21日星期日 13时49分25秒
/ System.out.println(“Programming is fun!”);
System.out.println(“Fundamentals First!”);
System.out.println(“Problem Driven!”);
wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java hello
Programming is fun!
Fundamentals First!
Problem Driven!

//ComputeExpression.javaSystem.out.println((10.5 + 2* 3)/(45- 3.5));wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java hello0.39759036144578314//WelcomInMessageDialogBox.java
//  JOptionPane.showMessageDialog(null, "welcome to Java!");//ComputerArea.java  2021年03月21日 星期日 14时03分47秒 double radius;double area;radius = 20;area = radius * radius * 3.14159;System.out.println("The area for the circle of radius " + radius + " is "+area);wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloThe area for the circle of radius 20.0 is 1256.636Scanner input = new Scanner(System.in);System.out.print("Enter a number for radius: ");double radius = input.nextDouble();double area = radius * radius * 3.14159;System.out.println("The area for the circle of radius "+ radius +" is " + area);wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloEnter a number for radius: 15.5The area for the circle of radius 15.5 is 754.7669975//ComputerAverage.javaScanner input = new Scanner(System.in);System.out.print("Enter three numbers: ");double number1 = input.nextDouble();double number2 = input.nextDouble();double number3 = input.nextDouble();double average = (number1 + number2 + number3)/3;System.out.println("The average of " + number1 + " " + number2 +" " + number3 + " is " + average);wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloEnter three numbers: 15.516.517.5The average of 15.5 16.5 17.5 is 16.5
//ComputeArea.java: Compute the area of a circledouble radius = 20;final double PI = 3.14159;double area = radius * radius * PI;System.out.println("The area for the circle of radius " + radius + " is "+area);wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloThe area for the circle of radius 20.0 is 1256.636//DisplayTime.java  2021年03月21日 星期日 14时16分59秒 Scanner input = new Scanner(System.in);System.out.print("Enter an integer for seconds: ");int seconds = input.nextInt();int minutes = seconds / 60;int remainingSeconds = seconds % 60;System.out.println(seconds + " seconds is " + minutes + " minutes and " + remainingSeconds + " seconds");wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloEnter an integer for seconds: 1212512125 seconds is 202 minutes and 5 seconds//FahrenheitToCelsius.java  2021年03月21日 星期日 14时18分20秒 Scanner input = new Scanner(System.in);System.out.print("Enter a degree in Fahrenheit: ");double fahrenheit = input.nextDouble();double celsius = (5.0 / 9)* (fahrenheit - 32);System.out.println("Fahrenheit "+ fahrenheit + " is " + celsius + " in Celsius");wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloEnter a degree in Fahrenheit: 100Fahrenheit 100.0 is 37.77777777777778 in Celsius

//ShowCurrentTime.java 2021年03月21日星期日 14时33分29秒
long totalMilliseconds = System.currentTimeMillis();
long totalSeconds = totalMilliseconds / 1000;
long currentSecond = totalSeconds % 60;
long totalMinutes = totalSeconds / 60;
long currentMinute = totalMinutes % 60;
long totalHours = totalMinutes / 60;
long currentHour = totalHours % 24;
System.out.println("Current time is “+ currentHour + “:”
+ currentMinute + “:” + currentSecond + " GMT”);
wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java hello
Current time is 6:32:51 GMT

//SalesTax.java Scanner input = new Scanner(System.in);System.out.print("Enter puchase amount: ");    double purchaseAmount = input.nextDouble();double tax = purchaseAmount * 0.06;System.out.println("Sales tax is "+ (int)(tax * 100)/ 100.0);wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloEnter puchase amount: 197.55Sales tax is 11.85//ComputeLoan.java  2021年03月21日 星期日 14时37分59秒 Scanner input = new Scanner(System.in);System.out.print("Enter yearly interest rate, for example 8.25: ");double annualInterestRate = input.nextDouble();double monthlyInterestRate = annualInterestRate / 1200;System.out.print("Enter number of years as an integer, for example 5: ");int numberOfYears = input.nextInt();System.out.print("Enter loan amount, for example 120000.95: ");double loanAmount = input.nextDouble();double monthlyPayment = loanAmount * monthlyInterestRate / (1-1/Math.pow(1 + monthlyInterestRate, numberOfYears* 12));double totalPayment = monthlyPayment* numberOfYears* 12;System.out.println("The monthly payment is " +(int)(monthlyPayment * 100)/ 100.0);System.out.println("The total payment is " +(int)(totalPayment * 100)/ 100.0);wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloEnter yearly interest rate, for example 8.25: 5.75Enter number of years as an integer, for example 5: 15Enter loan amount, for example 120000.95: 250000The monthly payment is 2076.02The total payment is 373684.53

//DispalyUnicode.java 2021年03月21日星期日 21时40分12秒
JOptionPane.showMessageDialog(null,
“\u6B22\u8FCE\u03b1\u03b2\u03b3”,
“\u6B22\u8FCE Welcome”,
JOptionPane.INFORMATION_MESSAGE);

//ComputeChange.java Scanner input = new Scanner(System.in);System.out.print("Enter an amount in double, for example 11.56: ");double amount = input.nextDouble();int remainingAmount = (int)(amount * 100);int numberOfOneDollars = remainingAmount / 100;remainingAmount = remainingAmount % 100;int numberOfQuarters = remainingAmount / 25;remainingAmount = remainingAmount % 25;int numberOfDimes = remainingAmount / 10;remainingAmount = remainingAmount % 10;int numberOfNickels = remainingAmount % 5;remainingAmount = remainingAmount % 5;int numberOfPennies = remainingAmount;System.out.println("Your amount "+ amount + "consists of\n" +"\t" + numberOfOneDollars + " dollars\n" + "\t" + numberOfQuarters + " quarters\n" + "\t" + numberOfDimes + " dimes\n" +"\t" + numberOfNickels + " nickels\n" + "\t" + numberOfPennies + " pennies"); wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloEnter an amount in double, for example 11.56: 11.56Your amount 11.56consists of11 dollars2 quarters0 dimes1 nickels1 pennies//ComputeLoanUsingInputDialog.java 2021年03月21日 星期日 21时55分36秒
String annualInterestRateString = JOptionPane.showInputDialog("Enter yearly interest rate, for example 8.25:");
double annualInterestRate = Double.parseDouble(annualInterestRateString);
double monthlyInterestRate = annualInterestRate / 1200;String numberOfYearsString = JOptionPane.showInputDialog("Enter number of years as an  integer, \nfor example 5:");
int numberOfYears = Integer.parseInt(numberOfYearsString);String loanString = JOptionPane.showInputDialog("Enter loan amount, for example 120000.95:");double loanAmount = Double.parseDouble(loanString);double monthlyPayment = loanAmount * monthlyInterestRate / (1
-1/Math.pow(1 + monthlyInterestRate, numberOfYears * 12));
double totalPayment = monthlyPayment * numberOfYears * 12;monthlyPayment = (int)(monthlyPayment * 100) / 100.0;
totalPayment = (int)(totalPayment * 100)/ 100.0;String output = "The monthly payment is " + monthlyPayment + "\nThe toal payment is " + totalPayment;
JOptionPane.showMessageDialog(null, output);

//AdditionQuiz.java 2021年03月25日星期四 19时55分38秒
int number1 = (int)(System.currentTimeMillis() % 10);
int number2 = (int)(System.currentTimeMillis() * 7 % 10);
Scanner input = new Scanner(System.in);
System.out.print(
"What is " + number1 + " + " + number2 + " ? ");
int answer = input.nextInt();
System.out.println(
number1 + " + " + number2 + " = " + answer + " is " +
(number1 + number2 == answer));
wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java hello
What is 4 + 8 ? 4
4 + 8 = 4 is false

//SimpleIfDemo.java 2021年03月25日 星期四 19时56分14秒 Scanner input = new Scanner(System.in);System.out.println("Enter an integer: ");int number = input.nextInt();if(number % 5 == 0)System.out.println("HiFive");if(number % 2 == 0)System.out.println("HiEven");
wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloEnter an integer: 30HiFiveHiEven//GuessBirthday.java 2021年03月25日 星期四 20时00分43秒 String set1 = "1   3  5  7\n" + "9  11 13 15\n" +"17 19 21 23\n" +"25 27 29 31";String set2 = "2   3  6  7\n" +"10 11 14 15\n" +"20 21 22 23\n" +"28 29 30 31";String set3 = "4   5  6  7\n" +"12 13 14 15\n" +"20 21 22 23\n" +"28 29 30 31";String set4 = "8   9 10 11\n" +"12 13 14 15\n" +"24 25 26 27\n" +"28 29 30 31";String set5 = "16 17 18 19\n" +"20 21 22 23\n" +"24 25 26 27\n" +"28 29 30 31";int day = 0;Scanner input = new Scanner(System.in);System.out.print("Is your birthday in Set1?\n");System.out.print(set1);System.out.print("\nEnter 0 for No and 1 for Yes: ");int answer = input.nextInt();if(answer == 1)day += 1;System.out.print("Is your birthday in Set2?\n");System.out.print(set2);System.out.print("\nEnter 0 for No and 1 for Yes: ");answer = input.nextInt();if(answer == 1)day += 2;System.out.print("Is your birthday in Set3?\n");System.out.print(set3);System.out.print("\nEnter 0 for No and 1 for Yes: ");answer = input.nextInt();if(answer == 1)day += 4;System.out.print("\nIs your birthday in Set4?\n");System.out.print(set4);System.out.print("\nEnter 0 for No and 1 for Yes: ");answer = input.nextInt();if(answer == 1)day += 8;System.out.print("Is your birthday in Set5?\n");System.out.print(set5);System.out.print("\nEnter 0 for No and 1 for Yes: ");answer = input.nextInt();if(answer == 1)day += 16;System.out.println("\nYour birthday is " + day + "!");
wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloIs your birthday in Set1?1   3  5  79  11 13 1517 19 21 2325 27 29 31Enter 0 for No and 1 for Yes: 1Is your birthday in Set2?2   3  6  710 11 14 1520 21 22 2328 29 30 31Enter 0 for No and 1 for Yes: 1Is your birthday in Set3?4   5  6  712 13 14 1520 21 22 2328 29 30 31Enter 0 for No and 1 for Yes: 0Is your birthday in Set4?8   9 10 1112 13 14 1524 25 26 2728 29 30 31Enter 0 for No and 1 for Yes: 0Is your birthday in Set5?16 17 18 1920 21 22 2324 25 26 2728 29 30 31Enter 0 for No and 1 for Yes: 1Your birthday is 19!
//SubtractionQuiz.java   2021年03月26日 星期五 07时26分29秒  int number1 = (int)(Math.random() * 10);int number2 = (int)(Math.random() * 10);if(number1 < number2){int temp = number1;number1 = number2;number2 = temp;}System.out.print("What is " + number1 + "-" + number2 +"?");Scanner input = new Scanner(System.in);int answer = input.nextInt();if (number1 - number2 == answer)System.out.println("You are correct!");elseSystem.out.println("Your answer is wrong\n" + number1 +"-" + number2 + " should be " + (number1 - number2));
wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloWhat is 8-3?5You are correct!// ComputerBMI.java  2021年03月26日 星期五 07时34分37秒   Scanner input = new Scanner(System.in);System.out.print("Enter weight in pounds: ");double weight = input.nextDouble();System.out.print("Enter height in inches: ");double height = input.nextDouble();final double KILOGRAMS_PER_POUND = 0.45359237;final double METERS_PER_INCH = 0.0254;double weightInKilograms = weight * KILOGRAMS_PER_POUND;double heightInMeters = height * METERS_PER_INCH;double bmi = weightInKilograms /(heightInMeters * heightInMeters);System.out.println("Your BMI is " + bmi);if(bmi < 16)System.out.println("You are seriously underweight");else if(bmi < 18)System.out.println("You are  underweight");else if(bmi < 24)System.out.println("You are normal weight");else if(bmi < 29)System.out.println("You are overweight");else if(bmi < 35)System.out.println("You are seriously overweight");elseSystem.out.println("You are gravely overweight");
wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloEnter weight in pounds: 146Enter height in inches: 70Your BMI is 20.948603801493316You are normal weight//ComputeTax.javaScanner input = new Scanner(System.in);System.out.print("(0-single filer, 1-married jointly,\n" +"2-married separately, 3-head of household)\n" +"Enter the filing status: ");int status = input.nextInt();System.out.print("Enter the taxable income: ");double income = input.nextDouble();double tax = 0;if(status == 0){if(income <= 8350)tax = income * 0.10;else if(income <= 33950)  tax = 8350 * 0.10 + (income - 8350)* 0.15;else if(income <= 82250)    tax = 8350 * 0.10 + (33950-8350)* 0.15 + (income - 33950)* 0.25;else if(income <= 171550)    tax = 8350 * 0.10 + (33950 - 8350)* 0.15+ (82250-33950)* 0.25 +(income - 82250) * 0.28;else if(income <= 372950)    tax = 8350 * 0.10 + (33950 - 8350)* 0.15+ (82250-33950)* 0.25 +(171550 - 82250) * 0.28 +(income - 171550)*0.33;elsetax = 8350 * 0.10 + (33950 - 8350)* 0.15+ (82250-33950)* 0.25 +(171550 - 82250) * 0.28 +(372950 - 171550)*0.33 +(income -372950) * 0.35 ; }else if(status == 1){}else if(status == 2){}else if(status == 3){}else {System.out.println("Error: invalid status");System.exit(0);}System.out.println("Tax is " + (int)(tax *100)/100.0);
wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java hello(0-single filer, 1-married jointly,2-married separately, 3-head of household)Enter the filing status: 0Enter the taxable income: 400000Tax is 117683.5

//TestBooleanOperators.java 3-7
Scanner input = new Scanner(System.in);
System.out.print("Enter an integer: ");
int number = input.nextInt();
System.out.println("Is " + number + "\n\tdivisible by 2 and 3? "+
(number % 2 == 0 && number % 3 == 0) + "\n\tdivisible by 2 or 3? " +
(number % 2 == 0 || number % 3 == 0) + "\n\tdivisible by 2 or 3, but not both? "
+ (number % 2 == 0 ^ number % 3 == 0));
wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java hello
Enter an integer: 18
Is 18
divisible by 2 and 3? true
divisible by 2 or 3? true
divisible by 2 or 3, but not both? false

//leapYear.java 3-8 Scanner input = new Scanner(System.in);System.out.print("Enter a year: ");int year = input.nextInt();boolean isLeapYear = (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);System.out.println(year + " is a leap year? " + isLeapYear);wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloEnter a year: 2008 2008 is a leap year? truewannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloEnter a year: 20022002 is a leap year? false//Lottery.java 3-9 2021年03月27日 星期六 10时10分53秒 int lottery = (int)(Math.random() * 100);Scanner input = new Scanner(System.in);System.out.print("Enter your lottery pick(two digits): ");int guess = input.nextInt();int lotteryDigit1 = lottery / 10;int lotteryDigit2 = lottery % 10;int guessDigit1 = guess / 10;int guessDigit2 = guess % 10;System.out.println("The lottery number is " + lottery);if(guess == lottery)System.out.println("Exact match: you win $10,000");else if(guessDigit2 == lotteryDigit1 && guessDigit1 == lotteryDigit2)System.out.println("Match all digits: you win $30,000");else if(guessDigit1 == lotteryDigit1 || guessDigit1 == lotteryDigit2|| guessDigit2 == lotteryDigit1 || guessDigit2 == lotteryDigit2)System.out.println("Match one digit: you win $1,000");elseSystem.out.println("Sorry, no match");wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloEnter your lottery pick(two digits): 45The lottery number is 37Sorry, no match//GuessBirthdayUsingConfirmationDialog.java 3-10String set1 = "1   3  5  7\n" + "9  11 13 15\n" +"17 19 21 23\n" +"25 27 29 31";String set2 = "2   3  6  7\n" +"10 11 14 15\n" +"20 21 22 23\n" +"28 29 30 31";String set3 = "4   5  6  7\n" +"12 13 14 15\n" +"20 21 22 23\n" +"28 29 30 31";String set4 = "8   9 10 11\n" +"12 13 14 15\n" +"24 25 26 27\n" +"28 29 30 31";String set5 = "16 17 18 19\n" +"20 21 22 23\n" +"24 25 26 27\n" +"28 29 30 31";int day = 0;int answer = JOptionPane.showConfirmDialog(null, "Is your birthday in these numbers?\n" + set1);if(answer == JOptionPane.YES_OPTION)day += 1;answer = JOptionPane.showConfirmDialog(null, "Is your birthday in these numbers?\n" + set2);if(answer == JOptionPane.YES_OPTION)day += 2;answer = JOptionPane.showConfirmDialog(null, "Is your birthday in these numbers?\n" + set3);if(answer == JOptionPane.YES_OPTION)day += 4;answer = JOptionPane.showConfirmDialog(null, "Is your birthday in these numbers?\n" + set4);if(answer == JOptionPane.YES_OPTION)day += 8;answer = JOptionPane.showConfirmDialog(null, "Is your birthday in these numbers?\n" + set5);if(answer == JOptionPane.YES_OPTION)day += 16;answer = JOptionPane.showConfirmDialog(null, "Your birthday is " +day+ " ! " );//GuessNumberOneTime.java 4-1int number = (int)(Math.random() * 101);Scanner input = new Scanner(System.in);System.out.println("Guess a magic number between 0 and 100");int guess = -1;while (true){System.out.print("\nEnter your guess: ");guess = input.nextInt();if(guess == number)System.out.println("Yes, the number is " + number);else if(guess > number) System.out.println("Your guess is too high ");else System.out.println("Your guess is too low ");}wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloGuess a magic number between 0 and 100Enter your guess: 80Your guess is too high Enter your guess: 40Your guess is too low Enter your guess: 60Your guess is too high Enter your guess: 50Your guess is too high Enter your guess: 45Your guess is too high Enter your guess: 42Your guess is too high Enter your guess: 41Yes, the number is 41//GuessNumberOneTime.java 4-1 P92 2021年03月28日 星期日 07时15分35秒 int number = (int)(Math.random() * 101);Scanner input = new Scanner(System.in);System.out.println("Guess a magic number between 0 and 100");int guess = -1;while(guess != number){System.out.print("\nEnter your guess: ");guess = input.nextInt();if(guess == number)System.out.println("Yes, the number is " + number);else if(guess > number)System.out.println("Your geuss is too high");elseSystem.out.println("Your guess is too low");
wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloGuess a magic number between 0 and 100Enter your guess: 60Your geuss is too highEnter your guess: 30Your guess is too lowEnter your guess: 45Your geuss is too highEnter your guess: 37Your guess is too lowEnter your guess: 42Your geuss is too highEnter your guess: 40Your geuss is too highEnter your guess: 39Yes, the number is 39}//SubtrationQuizLoop.java 4-3 2021年03月28日 星期日 07时27分25秒 final int NUMBER_OF_QUESTIONS = 5;int correctCount = 0;int count = 0;long startTime = System.currentTimeMillis();String output = " ";Scanner input = new Scanner(System.in);while(count < NUMBER_OF_QUESTIONS){int number1 = (int)(Math.random()* 10);int number2 = (int)(Math.random()* 10);if(number1 < number2){int temp = number1;number1 = number2;number2 = temp;}System.out.print("What is " + number1 + "-" + number2 + "? ");int answer = input.nextInt();if(number1 - number2 == answer){System.out.println("You are correct!");correctCount++;}elseSystem.out.println("Your answer if wrong.\n" + number1+ " - " + number2 + " should be " + (number1 - number2));count++;output += "\n" + number1 + " - " + number2 + " = " + answer +((number1 - number2 == answer)? " correct":" wrong");}long endTime = System.currentTimeMillis();long testTime = endTime - startTime;System.out.println("Correct count is " + correctCount +"\nTest time is " + testTime / 1000 + " seconds\n" + output);
wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloWhat is 7-5? 1Your answer if wrong.7 - 5 should be 2What is 9-0? 3Your answer if wrong.9 - 0 should be 9What is 6-0? 4Your answer if wrong.6 - 0 should be 6What is 7-2? 5You are correct!What is 9-6? 3You are correct!Correct count is 2Test time is 10 seconds7 - 5 = 1 wrong9 - 0 = 3 wrong6 - 0 = 4 wrong7 - 2 = 5 correct9 - 6 = 3 correct//4-4 SentinelValue.java 2021年03月28日 星期日 07时42分33秒 Scanner input = new Scanner(System.in);System.out.print("Enter an int value (the program exits if the input is 0):" );int data = input.nextInt();int sum = 0;while(data != 0){sum += data;System.out.print("Enter an int value (the program exits if the input is 0):");data = input.nextInt();}System.out.println("The sum is " + sum);
wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloEnter an int value (the program exits if the input is 0):3Enter an int value (the program exits if the input is 0):4Enter an int value (the program exits if the input is 0):5Enter an int value (the program exits if the input is 0):0The sum is 12//4-5 TestDoWhile.javaint data;int sum = 0;Scanner input = new Scanner(System.in);do{System.out.print("Enter an int value (the program exits if the input is 0):");data = input.nextInt();sum += data;    }while(data != 0);System.out.println("The sum is "+ sum);
wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloEnter an int value (the program exits if the input is 0):3Enter an int value (the program exits if the input is 0):4Enter an int value (the program exits if the input is 0):5Enter an int value (the program exits if the input is 0):0The sum is 12//4-6 MultiplicationTable.java 2021年03月28日 星期日 07时51分06秒 System.out.println("   Multiplication Table");System.out.print("  ");for(int j = 1; j <= 9; j++)System.out.print("   "+ j);System.out.println("\n---------------------------------------");for(int i = 1; i <= 9; i++){System.out.print(i + "|");for(int j = 1; j <= 9; j++){System.out.printf("%4d", i*j);}System.out.println();}
wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloMultiplication Table1   2   3   4   5   6   7   8   9---------------------------------------1|   1   2   3   4   5   6   7   8   92|   2   4   6   8  10  12  14  16  183|   3   6   9  12  15  18  21  24  274|   4   8  12  16  20  24  28  32  365|   5  10  15  20  25  30  35  40  456|   6  12  18  24  30  36  42  48  547|   7  14  21  28  35  42  49  56  638|   8  16  24  32  40  48  56  64  729|   9  18  27  36  45  54  63  72  81//TestSum.java 4-7 2021年03月28日 星期日 08时00分15秒 float sum = 0;for(float i = 0.01f; i <= 1.0f; i = i + 0.01f)sum += i;    System.out.println("The sum is " + sum);
wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloThe sum is 50.499985//4-8 GreatestCommonDivisor.java 2021年03月28日 星期日 08时03分15秒
//求最大公约数ＧＣＤScanner input = new Scanner(System.in);System.out.print("Enter first integer: ");int n1 = input.nextInt();System.out.print("Enter second integer: ");int n2 = input.nextInt();int gcd = 1;int k = 2;while(k <= n1 && k <= n2){if(n1 % k == 0 && n2 % k == 0)gcd = k;k++;}System.out.println("The greatest common divisor for " + n1 + " and " + n2 + " is " + gcd);//4.9 FutureTuition.java 2021年03月28日 星期日 08时26分18秒 double tuition = 10000;int year = 1;while(tuition < 20000){tuition = tuition * 1.07;year++;}System.out.println("Tuition will be doubled in "+ year + " years");
wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloTuition will be doubled in 12 years//4-10 MonteCarloSimulation.java 2021年03月28日 星期日 08时29分31秒 final int NUMBER_OF_TRIALS = 10000000;int numberOfHits = 0;for(int i = 0; i < NUMBER_OF_TRIALS; i++){double x = Math.random() * 2.0 - 1;double y = Math.random() * 2.0 - 1;if(x * x + y * y <= 1)numberOfHits++;}double pi = 4.0 * numberOfHits / NUMBER_OF_TRIALS;System.out.println("PI is " + pi);
wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloPI is 3.1413744
//TestBreak.java 4-11 p106 2021年03月30日 星期二 07时35分16秒
int sum = 0;
int number = 0;
while(number < 20){number++;sum += number;if(sum >= 100)break;
}
System.out.println("The number is "+ number);
System.out.println("The sum is " + sum);
wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloThe number is 14The sum is 105//TestContinue.java 4-12
int sum = 0;
int number = 0;
while(number < 20){number++;
//  if(number == 10 || number == 11)
//      continue;sum += number;
}
System.out.println("The sum is " + sum);
wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloThe sum is 189
wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloThe sum is 210(no if )//GuessNumberUsingBreak.java 4-13 2021年03月30日 星期二 07时40分19秒
int number = (int)(Math.random()* 101);
Scanner input = new Scanner(System.in);
System.out.println("Guess a magic number between 0 and 100");
while(true){System.out.print("\nEnter your guess: ");int guess = input.nextInt();if(guess == number){System.out.println("Yes, the number is "+ number);break;}else if(guess > number){System.out.println("Your geuss is too high");}elseSystem.out.println("Your guess is too low");     }

wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java hello
Guess a magic number between 0 and 100

Enter your guess: 60
Your geuss is too highEnter your guess: 30
Your geuss is too highEnter your guess: 15
Your geuss is too highEnter your guess: 6
Your geuss is too highEnter your guess: 3
Your geuss is too highEnter your guess: 1
Your guess is too lowEnter your guess: 2
Yes, the number is 2//PrimeNumber.java p4-14 2021年03月30日 星期二 07时48分37秒
final int NUMBER_OF_PRIMES = 50;
final int NUMBER_OF_PRIMES_PER_LINE = 10;
int count = 0;
int number = 2;
System.out.println("The first 50 prime numbers are \n");
while(count < NUMBER_OF_PRIMES){boolean isPrime = true;for(int divisor = 2; divisor <= number / 2; divisor++){if(number % divisor == 0){isPrime = false;break;}}
if(isPrime){count++;if(count % NUMBER_OF_PRIMES_PER_LINE == 0){System.out.println(number);}elseSystem.out.print(number + " ");}number++;}

wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java hello
The first 50 prime numbers are

2 3 5 7 11 13 17 19 23 29
31 37 41 43 47 53 59 61 67 71
73 79 83 89 97 101 103 107 109 113
127 131 137 139 149 151 157 163 167 173
179 181 191 193 197 199 211 223 227 229//SentinelValueUsingConfirmationDialog.java 4-15 2021年03月30日 星期二 07时55分05秒
int sum = 0;
int option = JOptionPane.YES_OPTION;
while(option == JOptionPane.YES_OPTION){String dataString = JOptionPane.showInputDialog("Enter an int value: ");
int data = Integer.parseInt(dataString);
sum += data;
option = JOptionPane.showConfirmDialog(null, "Continue?");
}
JOptionPane.showMessageDialog(null, "The sum is "+ sum);System.out.println("Sum from 1 to 10 is " + sum(1, 10));
System.out.println("Sum from 1 to 10 is " + sum(20, 30));
System.out.println("Sum from 1 to 10 is " + sum(35, 45));int i = 5;
int j = 2;
int k = max(i, j);
System.out.println("The maximum between " + i+ " and " + j + " is " + k);

}

//显示的是sum方法需要class，重新检查了一下，发现是class的大括号没有把sum方法包括起来
public static int sum(int i1, int i2){
int sum = 0;
for(int i = i1; i <= i2; i++)
sum += i;
return sum;
}

public static int max(int num1, int num2){
int result;
if(num1 > num2)
result = num1;
else
result = num2;
return result;
}
wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java hello
Sum from 1 to 10 is 55
Sum from 1 to 10 is 275
Sum from 1 to 10 is 440
The maximum between 5 and 2 is 5

//TestVoidMethod.java 5-2 2021年03月30日 星期二 19时29分21秒
System.out.print("The grade is ");
getGrade(78.5);
System.out.print("The grade is ");
getGrade(59.5);public static void getGrade(double score){if(score >= 90.0){System.out.println('A');}else if(score >= 80.0){System.out.println('B');}else if(score >= 70.0){System.out.println('C');}else if(score >= 60.0){System.out.println('D');}else {System.out.println('F');}
}System.out.print("The grade is "+ getGrade(78.5));
System.out.println("\nThe grade is "+ getGrade(59.5));
}public static char getGrade(double score){if(score >= 90.0)    return 'A';else if(score >= 80.0)return 'B';else if(score >= 70.0)return 'C';else if(score >= 60.0)return 'D';else return 'F';
}
wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloThe grade is CThe grade is F//Increment.java p5-4 2021年03月30日 星期二 19时51分49秒
int x = 1;
System.out.println("Before the call, x is " + x);
increment(x);
System.out.println("after the call, x is " + x);
}public static void increment(int n){n++;System.out.println("n inside the method is " + n);
}
wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloBefore the call, x is 1n inside the method is 2after the call, x is 1//TestPassByValue.java 5-5 2021年03月30日 星期二 19时54分52秒
int num1 = 1;
int num2 = 2;
System.out.println("Before invoking the swap method, num1 is " +num1 + " and num2 is " + num2);
swap(num1, num2);
System.out.println("After invoking the swap method, num1 is " +num1 + " and num2 is " + num2);
}public static void swap(int n1, int n2){System.out.println("\tInside the swap method");System.out.println("\t\tBefore swapping n1 is " + n1 +" n2 is " + n2);int temp = n1;n1 = n2;n2 = temp;System.out.println("\t\tAfter swapping n1 is " + n1 +" n2 is " + n2);
}
wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloBefore invoking the swap method, num1 is 1 and num2 is 2Inside the swap methodBefore swapping n1 is 1 n2 is 2After swapping n1 is 2 n2 is 1After invoking the swap method, num1 is 1 and num2 is 2

//5-6 p131 GreatestCommonDivisorMethod.java
Scanner input = new Scanner(System.in);
System.out.print("Enter first integer: ");
int n1 = input.nextInt();
System.out.print("Enter second integer: ");
int n2 = input.nextInt();
System.out.println("The greatest common divisor for "+ n1 +
" and " + n2 + " is " + gcd(n1, n2));
}
public static int gcd(int n1, int n2){
int gcd = 1;
int k = 2;
while (k <= n1 && k <= n2){
if(n1 % k == 0 && n2 % k == 0)
gcd = k;
k++;
}
return gcd;
}
wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java hello
Enter first integer: 45
Enter second integer: 75
The greatest common divisor for 45 and 75 is 15

//PrimeNumberMethod.java 2021年04月01日 星期四 13时38分30秒
System.out.println("The first 50 prime numbers are \n");
printPrimeNumbers(50);

}
public static void printPrimeNumbers(int numberOfPrimes){
final int NUMBER_OF_PRIMES_PER_LINE = 10;
int count = 0;
int number = 2;
while (count < numberOfPrimes){
if(isPrime(number)){
count++;
if(count % NUMBER_OF_PRIMES_PER_LINE == 0){
System.out.printf("%-5s\n", number);
}else
System.out.printf("%-5s", number);
}
number++;
}
}
public static boolean isPrime(int number){
for(int divisor = 2; divisor <= number / 2; divisor++){
if(number % divisor == 0){
return false;
}
}
return true;
wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java hello
The first 50 prime numbers are

 2    3    5    7    11   13   17   19   23   29   31   37   41   43   47   53   59   61   67   71   73   79   83   89   97   101  103  107  109  113  127  131  137  139  149  151  157  163  167  173  179  181  191  193  197  199  211  223  227  229  //5-8 Decimal2HexConversion.java p133  2021年04月01日 星期四 13时48分09秒
Scanner input = new Scanner(System.in);
System.out.print("Enter a decimal number: ");
int decimal = input.nextInt();
System.out.println("The hex number for decimal " + decimal + " is " + decimalToHex(decimal));
}
public static String decimalToHex(int decimal){String hex = "";while(decimal != 0){int hexValue = decimal % 16;hex = toHexChar(hexValue) + hex;decimal = decimal / 16;} return hex;
}
public static char toHexChar(int hexValue){if(hexValue <= 9 && hexValue >= 0)return (char)(hexValue + '0');elsereturn (char)(hexValue - 10 + 'A');
wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloEnter a decimal number: 1234The hex number for decimal 1234 is 4D2//5-9 TestMethodOverloading.java 2021年04月01日 星期四 13时58分43秒
System.out.println("The maximum between 3 and 4 is " + max(3, 4));
System.out.println("The maximum between 3.0 and 5.4 is " + max(3.0, 5.4));
System.out.println("The maximum between 3.0 and 5.4, and 10.14 is " + max(3.0, 5.4, 10.14));
}
public static int max(int num1, int num2){if(num1 > num2)return num1;elsereturn num2;
}
public static double max(double num1, double num2){if(num1 > num2)return num1;elsereturn num2;
}
public static double max(double num1, double num2, double num3){return max(max(num1, num2),num3);}
wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloThe maximum between 3 and 4 is 4The maximum between 3.0 and 5.4 is 5.4The maximum between 3.0 and 5.4, and 10.14 is 10.14
//bank.java P7     2021年04月01日 星期四 20时56分00秒
BankAccount ba1 = new BankAccount(100.00);
System.out.print("Before transactions, ");
ba1.display();
ba1.deposit(74.35);
ba1.withdraw(20.00);System.out.print("After transactions, ");
ba1.display();
}

// 错误: 无法从静态上下文中引用非静态变量 this
// BankAccount ba1 = new BankAccount(100.00);
// class BankAccount{} 改成 public staic class BankAccount{}

public static  class BankAccount{private double balance;public BankAccount(double openingBalance){balance = openingBalance;}public void deposit(double amount){balance = balance + amount;}public void withdraw(double amount){balance = balance - amount;}public void display(){System.out.println("balance= " + balance);}
}wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloBefore transactions, balance= 100.0After transactions, balance= 154.35long[] arr;
arr = new long[100];
int nElems = 0;
int j;
long searchKey;
arr[0] = 77;
arr[1] = 99;
arr[2] = 44;
arr[3] = 55;
arr[4] = 22;
arr[5] = 88;
arr[6] = 11;
arr[7] = 00;
arr[8] = 66;
arr[9] = 33;
nElems = 10;for(j = 0; j < nElems; j++)System.out.print(arr[j] + " ");
System.out.println("");searchKey = 66;
for(j = 0; j < nElems; j++)if(arr[j] == searchKey)  break;if(j == nElems)System.out.println("Can't find " + searchKey);elseSystem.out.println("found " + searchKey);searchKey = 55;
for(j = 0; j < nElems; j++)if(arr[j] == searchKey)  break;
for(int k = j; k < nElems; k++)arr[k] = arr[k+1];   //后面的高位覆盖前面55的数字位置nElems--;for(j = 0; j < nElems; j++)System.out.print(arr[j] + " ");
System.out.println("");
}wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java hello77 99 44 55 22 88 11 0 66 33 found 6677 99 44 22 88 11 0 66 33 //2.2 lowArray.java
LowArray arr;
arr = new LowArray(100);
int nElems = 0;
int j;arr.setElem(0, 77);
arr.setElem(1, 99);
arr.setElem(2, 44);
arr.setElem(3, 55);
arr.setElem(4, 22);
arr.setElem(5, 88);
arr.setElem(6, 11);
arr.setElem(7, 00);
arr.setElem(8, 66);
arr.setElem(9, 33);
nElems = 10;for(j = 0; j < nElems; j++)System.out.print(arr.getElem(j) + " ");
System.out.println("");int searchKey = 26;
for(j = 0; j < nElems; j++)if(arr.getElem(j) == searchKey)  break;if(j == nElems)System.out.println("Can't find " + searchKey);elseSystem.out.println("found " + searchKey);searchKey = 55;
for(j = 0; j < nElems; j++)if(arr.getElem(j) == searchKey)  break;
for(int k = j; k < nElems; k++)arr.setElem(k, arr.getElem(k+1)); //后面的高位覆盖前面55的数字位置nElems--;for(j = 0; j < nElems; j++)System.out.print(arr.getElem(j) + " ");
System.out.println("");
}public static class LowArray{private long[] a;public LowArray(int size){a = new long[size];}public void setElem(int index, long value){a[index] = value;}public long getElem(int index){return a[index];}
}wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java hello77 99 44 55 22 88 11 0 66 33 Can't find 2677 99 44 22 88 11 0 66 33 //highArray.java 2-3 p28
int maxSize = 100;
HighArray arr;
arr = new HighArray(maxSize);arr.insert(77) ;
arr.insert(99) ;
arr.insert(44) ;
arr.insert(55) ;
arr.insert(22) ;
arr.insert(88) ;
arr.insert(11) ;
arr.insert(00) ;
arr.insert(66) ;
arr.insert(33) ;arr.display();int searchKey = 35;if(arr.find(searchKey))System.out.println("Can't find " + searchKey);elseSystem.out.println("found " + searchKey);arr.delete(00);
arr.delete(55);
arr.delete(99);
arr.display();

}

public static class HighArray{private long[] a;private int nElems;public HighArray(int max){a = new long[max];nElems = 0;      }public boolean find(long searchKey){int j;for(j = 0; j < nElems; j++)if(a[j] == searchKey) break;if(j == nElems) return false;elsereturn true;}public void insert(long value){a[nElems] = value;nElems++;}public boolean delete(long value){//vlaue 打错了int j;for(j = 0; j < nElems; j++)if( value == a[j])// a[j] 错打成了 arr[j]break;if(j == nElems)  return false;else{for(int k = j; k < nElems; k++)a[k] = a[k+1];nElems--;return true;}}public void display(){for(int j = 0; j < nElems; j++)System.out.print(a[j] + " ");System.out.println("");}
}wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java hello77 99 44 55 22 88 11 0 66 33 found 3577 44 22 88 11 66 33

//2.4 orderArray.java p36 2021年04月02日星期五 20时53分48秒

int maxSize = 100;
OrdArray arr;
arr = new OrdArray(maxSize);arr.insert(77) ;
arr.insert(99) ;
arr.insert(44) ;
arr.insert(55) ;
arr.insert(22) ;
arr.insert(88) ;
arr.insert(11) ;
arr.insert(00) ;
arr.insert(66) ;
arr.insert(33) ;
int searchKey = 55;
if(arr.find(searchKey) != arr.size())System.out.println("Found " + searchKey);
elseSystem.out.println("Can't find " + searchKey);
arr.display();
arr.delete(00);
arr.delete(55);
arr.delete(99);
arr.display();

}

public static class OrdArray{private long[] a;private int nElems;public OrdArray(int max){a = new long[max];nElems = 0;}public int size(){return nElems;}public int find(long searchKey){int lowerBound = 0;int upperBound = nElems - 1;int curIn;while(true){curIn = (lowerBound + upperBound) / 2;if(a[curIn] == searchKey)return curIn;else if(lowerBound > upperBound)return nElems;else{if(a[curIn] < searchKey)lowerBound = curIn + 1;elseupperBound = curIn - 1;}}}public void insert(long value){int j;for(j = 0; j < nElems; j++)if(a[j] > value)break;for(int k = nElems; k > j; k--)a[k] = a[k-1];a[j] = value;nElems++;}public boolean delete(long value){int j = find(value);if(j == nElems)return false;else{for(int k = j; k < nElems; k++)a[k] = a[k+1];nElems--;return true;}}public void display(){for(int j = 0; j < nElems; j++)System.out.print(a[j] + " ");System.out.println("");}
}wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloFound 550 11 22 33 44 55 66 77 88 99 11 22 33 44 66 77 88 //classDataArray.java p42 2021年04月02日 星期五 21时09分40秒
int maxSize = 100;
ClassDataArray arr;
arr = new ClassDataArray(maxSize);
arr.insert("Evans", "Patty", 24);
arr.insert("Smith", "Lorraine", 37);
arr.insert("Yee", "Tom", 43);
arr.insert("Adams", "Henry", 63);
arr.insert("Hashimoto", "Sato", 21);
arr.insert("Stimso", "Henry", 29);
arr.insert("Velasquez", " Jose", 72);
arr.insert("Lamarque", "Henry", 54);
arr.insert("Vang", "Minh", 22);
arr.insert("Creswell", "Lucinda", 18);
arr.displayA();String searchKey = "Stimson";
Person found;
found = arr.find(searchKey);
if(found != null){System.out.print("Found ");found.displayPerson();
}elseSystem.out.println("Can't find " + searchKey);System.out.println("Deleting Smith, Yee,  and Creswell");
arr.delete("Smith");
arr.delete("Yee");
arr.delete("Creswell");arr.displayA();

}

public static class Person{private String lastName;private String firstName;private int age;public Person(String last, String first, int a){lastName = last;firstName = first;age = a;}public void displayPerson(){System.out.print("  Last name: " + lastName);System.out.print(",  First name: " + firstName);System.out.print(", Age: " + age);}public String getLast(){return lastName;}
}public static class ClassDataArray{private Person[] a;private int nElems;public ClassDataArray(int max){a = new Person[max];nElems = 0;}public Person find(String searchName){int j ;for(j = 0; j < nElems; j++)if(a[j].getLast().equals(searchName))break;if(j == nElems)return null;elsereturn a[j];}public void insert(String last, String first, int age){a[nElems] = new Person(last, first, age);nElems++;} public boolean delete(String searchName){int j;for(j = 0; j < nElems; j++)if(a[j].getLast().equals(searchName))break;if(j == nElems)return false;else{for(int k = j; k < nElems; k++)a[k] = a[k+1];nElems--;return true;}}public void displayA(){for(int j = 0; j < nElems; j++){a[j].displayPerson();                }}}wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java hello

Last name: Evans First name: Patty, Age: 24
Last name: Smith First name: Lorraine, Age: 37
Last name: Yee First name: Tom, Age: 43
Last name: Adams First name: Henry, Age: 63
Last name: Hashimoto First name: Sato, Age: 21
Last name: Stimso First name: Henry, Age: 29
Last name: Velasquez First name: Jose, Age: 72
Last name: Lamarque First name: Henry, Age: 54
Last name: Vang First name: Minh, Age: 22
Last name: Creswell First name: Lucinda, Age: 18
Can’t find Stimson
Deleting Smith, Yee, and Creswell
Last name: Evans First name: Patty, Age: 24
Last name: Adams First name: Henry, Age: 63
Last name: Hashimoto First name: Sato, Age: 21
Last name: Stimso First name: Henry, Age: 29
Last name: Velasquez First name:
//3.1 p57 bubbleSort.java 2021年04月02日星期五 21时48分21秒
int maxSize = 100;
ArrayBub arr;
arr = new ArrayBub(maxSize);

arr.insert(77) ;
arr.insert(99) ;
arr.insert(44) ;
arr.insert(55) ;
arr.insert(22) ;
arr.insert(88) ;
arr.insert(11) ;
arr.insert(00) ;
arr.insert(66) ;
arr.insert(33) ;
arr.display();
arr.bubbleSort();
arr.display();

}

public static class ArrayBub{private long[] a;private int nElems;public ArrayBub(int max){a = new long[max];nElems = 0;}public void insert(long value){a[nElems] = value;nElems++;}public void display(){for(int j = 0; j < nElems; j++)System.out.print(a[j] + " ");System.out.println("");}public void bubbleSort(){int out, in;for(out = nElems-1; out > 1; out--)for(in = 0; in < out; in++)if(a[in] > a[in + 1])swap(in, in+1);}private void swap(int one, int two){long temp = a[one];a[one] = a[two];    a[two] = temp;}
}wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java hello77 99 44 55 22 88 11 0 66 33 0 11 22 33 44 55 66 77 88 99
//RandomCharacter.java 2021年04月03日 星期六 07时47分53秒 p140final int NUMBER_OF_CHARS = 175;final int CHARS_PER_LINE = 25;for(int i = 0; i < NUMBER_OF_CHARS; i++){char ch = RandomCharacter.getRandomLowerCaseLetter();if((i+1)% CHARS_PER_LINE == 0)System.out.println(ch);elseSystem.out.print(ch);}
}    //漏了 }public static class RandomCharacter{  // 少打了 public staticpublic static char getRandomCharacter(char ch1, char ch2){return(char)(ch1 + Math.random() * (ch2 - ch1 + 1));}public static char getRandomLowerCaseLetter(){return getRandomCharacter('a', 'z');}public static char getRandomUpperCaseLetter(){return getRandomCharacter('A', 'Z');}public static char getRandomDigitCharacter(){return getRandomCharacter('0', '9');}public static char getRandomCharacter(){return getRandomCharacter('\u0000', '\uFFFF');}
}wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java hellopajapbgtjkwafwnkwejgvlxpkofqjuvritdarqgdzeqzvwruaaqquvexmcqlwwoymlvuipsxhjwiivoqipzinxtghxkizvrxfjmtfrgfifxbrdvrlpbyjyhqgcgxfpwmsvjdvdhjhtfvfdqlttprzkmrznyqoopnssyxptmsreqzzqoScanner input = new Scanner(System.in);
System.out.print("Enter full year (e.g.,2001): ");
int year = input.nextInt();
System.out.print("Enter month as number between 1 and 12: ");
int month = input.nextInt();
printMonth(year, month);
}public static void printMonth(int year, int month){System.out.print(month + " " + year);
}
public static void printMonthBody(int year, int month){}
public static String getMonthName(int month){return "January";
}
public static int getTotalNumberOfDays(int year, int month){return 10000;
}
public static int getNumberOfDaysInMonth(int year, int month){return 31;
}
public static boolean isLeapYear(int year){return true;
}wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloEnter full year (e.g.,2001): 2020Enter month as number between 1 and 12: 44 2020//PrintCalendar.java p144 2021年04月03日 星期六 08时17分07秒
Scanner input = new Scanner(System.in);
System.out.print("Enter full year (e.g.,2001): ");
int year = input.nextInt();
System.out.print("Enter month as number between 1 and 12: ");
int month = input.nextInt();
printMonth(year, month);
}public static void printMonth(int year, int month){printMonthTitle(year, month);printMonthBody(year, month);
}
public static void printMonthTitle(int year, int month){System.out.println("   "+ getMonthName(month) + " " + year);System.out.println("-----------------------------");System.out.println(" Sun Mon Tue Wed Thu Fri Sat ");
}
public static String getMonthName(int month){String monthName = " ";switch(month){case 1 : monthName = "January"; break;  case 2 : monthName = "February"; break;case 3 : monthName = "March"; break;   case 4 : monthName = "April"; break;case 5 : monthName = "May"; break;    case 6 : monthName = "June"; break;case 7 : monthName = "July"; break;    case 8 : monthName = "August"; break;case 9 : monthName = "September"; break; case 10: monthName = "October"; break;case 11: monthName = "November"; break; case 12: monthName = "December"; }return monthName;
}
public static void printMonthBody(int year, int month){int startDay = getStartDay(year, month);int numberOfDaysInMonth = getNumberOfDaysInMonth(year, month);int i = 0;for(i = 0; i < startDay; i++)System.out.print("  ");for(i = 1; i <= numberOfDaysInMonth; i++){System.out.printf("%4d", i);//printf  打错了 printif((i + startDay) % 7 == 0)System.out.println();}System.out.println();
}
public static int getStartDay(int year, int month){final int START_DAY_FOR_JAN_1_1800 = 3;int totalNumberOfDays = getTotalNumberOfDays(year, month);return (totalNumberOfDays + START_DAY_FOR_JAN_1_1800) % 7;
}
public static int getTotalNumberOfDays(int year, int month){int total = 0;for(int i = 1800; i < year; i++)if(isLeapYear(i))total = total + 366;elsetotal = total + 365;for(int i = 1; i < month; i++)total = total + getNumberOfDaysInMonth(year, i);return total;
}
public static int getNumberOfDaysInMonth(int year, int month){if(month == 1 || month == 3 || month == 5 || month == 7 ||month == 8 || month == 10 || month == 12)return 31;if(month == 4 || month == 6 || month == 9 || month == 11)return 30;if(month == 2) return isLeapYear(year) ? 29 : 28;return 0;
}
public static boolean isLeapYear(int year){return year % 400 == 0 || (year % 4 == 0 && year % 100 != 0);
}wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloEnter full year (e.g.,2001): 2021Enter month as number between 1 and 12: 4April 2021-----------------------------Sun Mon Tue Wed Thu Fri Sat 1   2   34   5   6   7   8   9  1011  12  13  14  15  16  1718  19  20  21  22  23  2425  26  27  28  29  30

//3.2 p63 selectSort.java 2021年04月03日星期六 18时10分07秒
int maxSize = 100;
ArraySel arr;
arr = new ArraySel(maxSize);

arr.insert(77) ;
arr.insert(99) ;
arr.insert(44) ;
arr.insert(55) ;
arr.insert(22) ;
arr.insert(88) ;
arr.insert(11) ;
arr.insert(00) ;
arr.insert(66) ;
arr.insert(33) ;
arr.display();
arr.selectionSort();
arr.display();

}
public static class ArraySel{
private long[] a;
private int nElems;

 public ArraySel(int max){a = new long[max];nElems = 0;}public void insert(long value){a[nElems] = value;nElems++;}public void display(){for(int j = 0; j < nElems; j++)System.out.print(a[j] + " ");System.out.println("");}public void selectionSort(){int out, in, min;for(out = 0; out < nElems - 1; out++){min = out;for(in = out + 1; in <nElems; in++)if(a[in] < a[min])min = in;swap(out, min);}}private void swap(int one, int two){long temp = a[one];a[one] = a[two];a[two] = temp;}}wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java hello77 99 44 55 22 88 11 0 66 33 0 11 22 33 44 55 66 77 88 99

//3.3 p70 insertSort.java 2021年04月03日星期六 19时16分52秒
int maxSize = 100;
ArrayIns arr;
arr = new ArrayIns(maxSize);

arr.insert(77) ;
arr.insert(99) ;
arr.insert(44) ;
arr.insert(55) ;
arr.insert(22) ;
arr.insert(88) ;
arr.insert(11) ;
arr.insert(00) ;
arr.insert(66) ;
arr.insert(33) ;
arr.display();
arr.insertionSort();
arr.display();

}
public static class ArrayIns{
private long[] a;
private int nElems;

 public ArrayIns(int max){a = new long[max];nElems = 0;}public void insert(long value){a[nElems] = value;nElems++;}public void display(){for(int j = 0; j < nElems; j++)System.out.print(a[j] + " ");System.out.println("");}public void insertionSort(){int in, out;for(out = 1; out < nElems; out++){long temp = a[out];in = out;while(in > 0 && a[in -1] >= temp){a[in] = a[in - 1];--in;}a[in] = temp;}}
}wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java hello77 99 44 55 22 88 11 0 66 33 0 11 22 33 44 55 66 77 88 99 //objectSort.java p72 2021年04月03日 星期六 19时33分40秒
int maxSize = 100;
ArrayInOb arr;
arr = new ArrayInOb(maxSize);
arr.insert("Evans", "Patty", 24);
arr.insert("Smith", "Doc", 59);
arr.insert("Smith", "Lorraine", 37);
arr.insert("Smith", "Paul", 37);
arr.insert("Yee", "Tom", 43);
arr.insert("Adams", "Henry", 63);
arr.insert("Hashimoto", "Sato", 21);
arr.insert("Stimso", "Henry", 29);
arr.insert("Velasquez", " Jose", 72);
arr.insert("Lamarque", "Henry", 54);
arr.insert("Vang", "Minh", 22);
arr.insert("Creswell", "Lucinda", 18);
System.out.println("Before sorting: ");
arr.display();
arr.insertionSort();System.out.println("After sorting:");
arr.display();
}public static class Person{private String lastName;private String firstName;private int age;public Person(String last, String first, int a){lastName = last;firstName = first;age = a;}public void displayPerson(){System.out.print("  Last name: " + lastName);System.out.print(",  First name: " + firstName);System.out.print(",  Age: " + age);}public String getLast(){return lastName;}
}
public static class ArrayInOb{private Person[] a;private int nElems;public ArrayInOb(int max){a = new Person[max];nElems = 0;}public void insert(String last, String first, int age){a[nElems] = new Person(last, first, age);nElems++;}public void display(){for(int j = 0; j < nElems; j++)a[j].displayPerson();System.out.println("");}public void insertionSort(){int in, out;for(out = 1; out < nElems; out++){Person temp = a[out];in = out;while(in > 0 && a[in-1].getLast().compareTo(temp.getLast())>0){a[in] = a[in - 1];--in;}a[in] = temp;}}
}wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java hello

Before sorting:
Last name: Evans, First name: Patty, Age: 24
Last name: Smith, First name: Doc, Age: 59
Last name: Smith, First name: Lorraine, Age: 37
Last name: Smith, First name: Paul, Age: 37
Last name: Yee, First name: Tom, Age: 43
Last name: Adams, First name: Henry, Age: 63
Last name: Hashimoto, First name: Sato, Age: 21
Last name: Stimso, First name: Henry, Age: 29
Last name: Velasquez, First name: Jose, Age: 72
Last name: Lamarque, First name: Henry, Age: 54
Last name: Vang, First name: Minh, Age: 22
Last name: Creswell, First name: Lucinda, Age: 18
After sorting:
Last name: Adams, First name: Henry, Age: 63
Last name: Creswell, First name: Lucinda, Age: 18
Last name: Evans, First name: Patty, Age: 24
Last name: Hashimoto, First name: Sato, Age: 21
Last name: Lamarque, First name: Henry, Age: 54
Last name: Smith, First name: Doc, Age: 59
Last name: Smith, First name: Lorraine, Age: 37
Last name: Smith, First name: Paul, Age: 37
Last name: Stimso, First name: Henry, Age: 29
Last name: Vang, First name: Minh, Age: 22
Last name: Velasquez, First name: Jose, Age: 72
Last name: Yee, First name: Tom, Age: 43

//stack.java p84 2021年04月03日 星期六 19时35分00秒
StackX theStack = new StackX(10);
theStack.push(20);
theStack.push(40);
theStack.push(60);
theStack.push(80);while(!theStack.isEmpty()){long value = theStack.pop();System.out.print(value);System.out.print(" ");
}
System.out.println(" ");

}

public static class StackX{private int maxSize;private long[] stackArray;private int top;public StackX(int s){maxSize = s;stackArray = new long[maxSize];top = -1;    }public void push(long j){stackArray[++top] = j;}public long pop(){  // long 型 错误打成void 型return stackArray[top--];}public long peek(){return stackArray[top];}public boolean isEmpty(){return (top == -1);}public boolean isFull(){return (top == maxSize - 1);      }
}wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java hello80 60 40 20  //4-2 reverse.java p87 2021年04月03日 星期六 19时46分35秒
String input, output;
while(true){System.out.print("Enter a string: ");System.out.flush();input = getString();if(input.equals(""))break;Reverser theReverser = new Reverser(input);
output = theReverser.doRev();
System.out.println("Reversed: " + output);
}

}
public static String getString() throws IOException{
InputStreamReader isr = new InputStreamReader(System.in);
BufferedReader br = new BufferedReader(isr);
String s = br.readLine();
return s;
}

public static class StackX{private int maxSize;private char[] stackArray;private int top;public StackX(int max){maxSize = max;stackArray = new char[maxSize];top = -1;    }public void push(char j){stackArray[++top] = j;}public char pop(){  // long 型 错误打成void 型return stackArray[top--];}public char peek(){return stackArray[top];}public boolean isEmpty(){return (top == -1);}public boolean isFull(){return (top == maxSize - 1);      }
}public static class Reverser{private String input;private String output;public Reverser(String in){input = in;}public String doRev(){int stackSize = input.length();StackX theStack = new StackX(stackSize);for(int j = 0; j < input.length(); j++){char ch = input.charAt(j);theStack.push(ch);}        output = " ";while(!theStack.isEmpty()){char ch = theStack.pop();output = output + ch;}return output;}
}wannian07@wannian07-PC:~/Desktop/Introduction to Java Programming$ java helloEnter a string: partReversed:  trapEnter a string: I love JavaReversed:  avaJ evol I//错误: 未报告的异常错误IOException; 必须对其进行捕获或声明以便抛出  input = getString();//在Java中，根据错误性质将运行错误分为两类：错误和异常。//在Java程序的执行过程中，如果出现了异常事件，就会生成一个异常对象。生成的异常对象将传递Java运行时系统，//这一异常的产生和提交过程称为抛弃（throw）异常。当Java运行时系统得到一个异常对象时，//它将会沿着方法的调用栈逐层回溯，寻找处理这一异常的代码。找到能够处理这类异常的方法后，//运行时系统把当前异常对象交给这个方法进行处理，这一过程称为捕获（catch）异常。//       https://blog.csdn.net/qq_37423198/article/details/68922379// 解决：1     即在main函数的后面加入throws Exception的异常捕获//      2   利用try,catch

*/
}

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