java整数类和自然数类的简单实现

只是简单实现了构造方法、加法减法、输出和比较的方法。
代码有很多地方重复，比较乱，初学者水平。
为了实现多位计算，对数字是用数组列表记录每一位。

private int length;          //记录数字的长度
private ArrayList<Integer> numbers;       //记录数字的每一位

import java.util.ArrayList;public class MyNumber {public static void main(String[] args) {//成员方法的测试MyNaturalNumbers naturalNumber1 = new MyNaturalNumbers("1000000000000000000000");System.out.print("自然数1长度:" + naturalNumber1.getLength() + " " + "自然数1:");naturalNumber1.outputNumber();MyNaturalNumbers naturalNumber2 = new MyNaturalNumbers("2222222222222222222222");System.out.print("自然数2长度:" + naturalNumber2.getLength() + " " + "自然数2:");naturalNumber2.outputNumber();MyNaturalNumbers naturalNumber3 = new MyNaturalNumbers("1111111111111111111199");System.out.print("自然数3数字长度:" + naturalNumber3.getLength() + " " + "自然数3:");naturalNumber3.outputNumber();System.out.println("判断自然数1和2的大小(1前者大，0相等，-1后者大):" + naturalNumber1.equals(naturalNumber2));System.out.print("自然数1加上自然数2后的结果:");naturalNumber1.add(naturalNumber2);naturalNumber1.outputNumber();System.out.print("自然数2减去自然数3后的结果:");naturalNumber2.reduce(naturalNumber3);naturalNumber2.outputNumber();MyInteger myInteger1 = new MyInteger("10000000000123456789");System.out.print("整数1长度:" + myInteger1.getLength() + " " + "整数1:");myInteger1.outputNumber();MyInteger myInteger2 = new MyInteger("-22223333444455556666");System.out.print("整数2长度:" + myInteger2.getLength() + " " + "整数2:");myInteger2.outputNumber();MyInteger myInteger3 = new MyInteger("-66666666666666666666");System.out.print("整数3长度:" + myInteger3.getLength() + " " + "整数3:");myInteger3.outputNumber();System.out.print("整数1减去整数2后的结果:");myInteger1.reduce(myInteger2);myInteger1.outputNumber();System.out.println("判断自然数1和整数1的大小(1前者大，0相等，-1后者大):" + naturalNumber1.equals(myInteger1));System.out.println("判断整数1和整数2大小(1前者大，0相等，-1后者大):" + myInteger1.equals(myInteger2));System.out.println("判断整数1和自然数1大小(1前者大，0相等，-1后者大):" + myInteger1.equals(naturalNumber1));System.out.println("把整数3转化会字符串格式化："+myInteger3.toString());}
}class Number {private int length;//数字的长度private ArrayList<Integer> numbers;//记录数字的每一位public int getLength() {return this.length;}public ArrayList<Integer> getNumbers() {return numbers;}
}class MyInteger extends Number {private int length;//数字的长度private ArrayList<Integer> numbers;//记录数字的每一位public void setLength(int length) {this.length = length;}public void setNumbers(ArrayList<Integer> numbers) {this.numbers = numbers;}public int getLength() {return this.length;}public ArrayList<Integer> getNumbers() {return numbers;}//构造方法public MyInteger() {this.length = 0;this.numbers = new ArrayList<>();}public MyInteger(String number) {numbers = new ArrayList<>();if (number.length() == 1 && number.equals(0)) {this.length = 0;this.numbers.add(0);} else {int i = 0;for (int j = number.length() - 1; j >= 0; j--) {if (number.charAt(j) == '-') {this.numbers.add(Integer.valueOf(number.charAt(0)));i++;} else if (number.charAt(j) != ',')this.numbers.add(Integer.valueOf(number.charAt(j)) - 48);elsei++;}this.length = number.length() - i;}}public MyInteger(MyNaturalNumbers myNaturalNumbers) {this.length = myNaturalNumbers.getLength();this.numbers = myNaturalNumbers.getNumbers();}//输出数字public void outputNumber() {for (int i = numbers.size() - 1; i >= 0; i--) {if (numbers.get(i) == 45)System.out.print('-');elseSystem.out.print(numbers.get(i));}System.out.println();}//数字相加方法public void add(MyInteger myInteger) {//加的数为0if (myInteger.length == 0) {return;}//暂时存放结果ArrayList<Integer> resultNumber = new ArrayList<>();int longLength = this.length > myInteger.length ? this.length : myInteger.length;int shortLength = this.length < myInteger.length ? this.length : myInteger.length;int val1;int val2;int carry = 0;int borrowCur = 0;int borrowNext;int temp1;int temp2;//减数和被减数的正负符号int minuendSign = this.numbers.get(this.numbers.size() - 1) == '-' ? -1 : 1;int subtractionSign = myInteger.numbers.get(myInteger.numbers.size() - 1) == '-' ? -1 : 1;//异号相加的情况//绝对值大小比较int compareAbs = this.equalsAbs(myInteger);if (minuendSign * subtractionSign < 0) {if (compareAbs == 0) {resultNumber.add(0);this.length = 0;this.numbers = resultNumber;return;}for (int i = 0; i < longLength; i++) {if (i < shortLength) {val1 = this.numbers.get(i);val2 = myInteger.numbers.get(i);} else if (i >= shortLength && i < longLength) {if (compareAbs == 1) {val1 = this.numbers.get(i);val2 = 0;} else {val2 = myInteger.numbers.get(i);val1 = 0;}} else {val1 = 0;val2 = 0;}//前者绝对值大，相减为正数if (compareAbs == 1) {borrowNext = val1 - val2 - borrowCur >= 0 ? 0 : 1;temp1 = val1 - borrowCur - val2 + borrowNext * 10;borrowCur = borrowNext;resultNumber.add(temp1);}//后者绝对值大，相减为负数if (compareAbs == -1) {borrowNext = val2 - val1 - borrowCur >= 0 ? 0 : 1;temp1 = val2 - borrowCur - val1 + borrowNext * 10;borrowCur = borrowNext;resultNumber.add(temp1);}}//去除高位0int indexZero = resultNumber.size() - 1;while (resultNumber.get(indexZero) == 0) {resultNumber.remove(resultNumber.size() - 1);indexZero--;}//为负则放入负号,结果赋值if ((compareAbs == -1 && minuendSign == 1) || (compareAbs == 1 && minuendSign == -1)) {resultNumber.add(45);this.length = resultNumber.size() - 1;} else {this.length = resultNumber.size();}this.numbers = resultNumber;}//同号相加的情况if (minuendSign * subtractionSign > 0) {for (int i = 0; (i < longLength) || carry != 0; i++) {if (i < shortLength) {val1 = this.numbers.get(i);val2 = myInteger.numbers.get(i);} else if (i >= shortLength && i < longLength) {if (this.length > myInteger.length) {val1 = this.numbers.get(i);} else {val1 = myInteger.numbers.get(i);}val2 = 0;} else {val1 = 0;val2 = 0;}temp2 = val1 + val2 + carry;carry = temp2 / 10;resultNumber.add(temp2 % 10);}if (minuendSign == 1)this.length = resultNumber.size();else {resultNumber.add(45);this.length = resultNumber.size() - 1;}this.numbers = resultNumber;}}//数字相减方法public void reduce(MyInteger myInteger) {MyInteger temp = new MyInteger();temp.length = myInteger.length;temp.numbers = myInteger.numbers;if (myInteger.numbers.get(myInteger.numbers.size() - 1) == '-') {temp.numbers.remove(myInteger.numbers.size() - 1);} else {temp.numbers.add(45);}this.add(temp);}//字符串格式化public String toString() {String number = "";for (int i = this.numbers.size() - 1; i >= 0; i--) {if (this.numbers.get(i) == 45)number = number + '-';elsenumber = number + this.numbers.get(i);}return number;}//比较两个整数的大小public int equals(MyInteger myInteger) {int myInteger2Size = myInteger.getNumbers().size();int myInteger1Size = this.numbers.size();if (myInteger.getNumbers().get(myInteger2Size - 1) == '-' && this.numbers.get(myInteger1Size - 1) != '-')return 1;else if (myInteger.getNumbers().get(myInteger2Size - 1) == '-' && this.numbers.get(myInteger1Size - 1) != '-')return -1;else if (myInteger.getNumbers().get(myInteger2Size - 1) != '-' && this.numbers.get(myInteger1Size - 1) != '-') {if (this.length > myInteger.getLength())return 1;else if (this.length < myInteger.getLength())return -1;else {for (int i = this.length - 1; i >= 0; i--) {if (this.numbers.get(i) > myInteger.getNumbers().get(i))return 1;else if (this.numbers.get(i) < myInteger.getNumbers().get(i))return -1;elsecontinue;}}return 0;} else {if (this.length > myInteger.getLength())return -1;else if (this.length < myInteger.getLength())return 1;else {for (int i = this.length - 1; i >= 0; i--) {if (this.numbers.get(i) > myInteger.getNumbers().get(i))return -1;else if (this.numbers.get(i) < myInteger.getNumbers().get(i))return 1;elsecontinue;}}return 0;}}//比较两个整数绝对值的大小public int equalsAbs(MyInteger myInteger) {if (this.length > myInteger.length)return 1;else if (this.length < myInteger.length)return -1;else {for (int i = this.length - 1; i >= 0; i--) {if (this.numbers.get(i) > myInteger.numbers.get(i))return 1;else if (this.numbers.get(i) < myInteger.numbers.get(i))return -1;elsecontinue;}}return 0;}//比较一个整数和一个自然数的大小public int equals(MyNaturalNumbers myNaturalNumbers) {int myIntegerSize = this.numbers.size();if (this.numbers.get(myIntegerSize - 1) == '-')return -1;else if (this.length > myNaturalNumbers.getLength())return 1;else if (this.length < myNaturalNumbers.getLength())return -1;else {for (int i = this.length - 1; i >= 0; i--) {if (this.numbers.get(i) > myNaturalNumbers.getNumbers().get(i))return 1;else if (this.numbers.get(i) < myNaturalNumbers.getNumbers().get(i))return -1;elsecontinue;}}return 0;}
}class MyNaturalNumbers extends Number {public void setLength(int length) {this.length = length;}public int getLength() {return this.length;}public ArrayList<Integer> getNumbers() {return numbers;}public void setNumbers(ArrayList<Integer> numbers) {this.numbers = numbers;}private int length;//数字的长度private ArrayList<Integer> numbers;//记录数字的每一位//构造方法public MyNaturalNumbers() {this.length = 0;this.numbers = new ArrayList<>();}public MyNaturalNumbers(String number) {numbers = new ArrayList<>();//为负数提示错误if (number.charAt(0) == '-') {System.out.println("自然数不能为负");this.length = -1;}//为0else if (number.length() == 1 && number.equals(0)) {this.length = 0;this.numbers.add(0);} else {//为正整数int i = 0;for (int j = number.length() - 1; j >= 0; j--) {if (number.charAt(j) != ',')this.numbers.add(Integer.valueOf(number.charAt(j)) - 48);elsei++;}this.length = number.length() - i;}}//输出数字public void outputNumber() {for (int i = numbers.size() - 1; i >= 0; i--) {System.out.print(numbers.get(i));}System.out.println();}//数字相加方法public void add(MyNaturalNumbers myNaturalNumbers) {MyNaturalNumbers res = new MyNaturalNumbers();int val1;int val2;int temp;int carry = 0;int maxLength = this.length > myNaturalNumbers.length ? this.length : myNaturalNumbers.length;int minLength = this.length < myNaturalNumbers.length ? this.length : myNaturalNumbers.length;for (int i = 0; (i < maxLength) || carry != 0; i++) {if (i < minLength) {val1 = this.numbers.get(i);val2 = myNaturalNumbers.numbers.get(i);} else if (i >= minLength && i < maxLength) {if (this.length > myNaturalNumbers.length) {val1 = this.numbers.get(i);} else {val1 = myNaturalNumbers.numbers.get(i);}val2 = 0;} else {val1 = 0;val2 = 0;}temp = val1 + val2 + carry;carry = temp / 10;res.numbers.add(temp % 10);}res.length = res.numbers.size();this.numbers = res.numbers;this.length = res.length;}//数字相减方法public MyInteger reduce(MyNaturalNumbers myNaturalNumbers) {MyInteger res = new MyInteger();int val1;int val2;int borrowCur = 0;int borrowNext;int temp;int compare = this.equals(myNaturalNumbers);ArrayList<Integer> resultNumber = new ArrayList<>();int maxLength = this.length > myNaturalNumbers.length ? this.length : myNaturalNumbers.length;int minLength = this.length < myNaturalNumbers.length ? this.length : myNaturalNumbers.length;//两数相等，相减为0if (compare == 0) {resultNumber.add(0);res.setLength(0);res.setNumbers(resultNumber);this.length = res.getLength();this.numbers = res.getNumbers();return res;}for (int i = 0; i < maxLength; i++) {if (i < minLength) {val1 = this.numbers.get(i);val2 = myNaturalNumbers.numbers.get(i);} else if (i >= minLength && i < maxLength) {if (compare == 1) {val1 = this.numbers.get(i);val2 = 0;} else {val2 = myNaturalNumbers.numbers.get(i);val1 = 0;}} else {val1 = 0;val2 = 0;}//前者大，相减为正数if (compare == 1) {borrowNext = val1 - val2 - borrowCur >= 0 ? 0 : 1;temp = val1 - borrowCur - val2 + borrowNext * 10;borrowCur = borrowNext;resultNumber.add(temp);}//后者大，相减为负数if (compare == -1) {borrowNext = val2 - val1 - borrowCur >= 0 ? 0 : 1;temp = val2 - borrowCur - val1 + borrowNext * 10;borrowCur = borrowNext;resultNumber.add(temp);}}//去除高位0int indexZero = resultNumber.size() - 1;while (resultNumber.get(indexZero) == 0) {resultNumber.remove(resultNumber.size() - 1);indexZero--;}//为负则放入负号if (compare == -1) {resultNumber.add(45);}//结果对象赋值res.setNumbers(resultNumber);if (resultNumber.get(resultNumber.size() - 1) == 45) {res.setLength(resultNumber.size() - 1);System.out.println("运算结果不为自然数,返回值为负整数");} else {res.setLength(resultNumber.size());this.length = res.getLength();this.numbers = res.getNumbers();}return res;}//通过自然数创建整数public MyInteger toMyInteger() {MyInteger myInteger = new MyInteger();myInteger.setLength(this.length);myInteger.setNumbers(this.numbers);return myInteger;}//字符串格式化public String toString() {String number = "";for (int i = this.numbers.size() - 1; i >= 0; i--) {number = number + this.numbers.get(i);}return number;}//比较两个自然数大小public int equals(MyNaturalNumbers myNaturalNumbers) {if (this.length > myNaturalNumbers.length)return 1;else if (this.length < myNaturalNumbers.length)return -1;else {for (int i = this.length - 1; i >= 0; i--) {if (this.numbers.get(i) > myNaturalNumbers.numbers.get(i))return 1;else if (this.numbers.get(i) < myNaturalNumbers.numbers.get(i))return -1;elsecontinue;}}return 0;}//比较自然数与整数的大小public int equals(MyInteger myInteger) {int myIntegerSize = myInteger.getNumbers().size();if (myInteger.getNumbers().get(myIntegerSize - 1) == '-')return 1;else {if (this.length > myInteger.getLength())return 1;else if (this.length < myInteger.getLength())return -1;else {for (int i = this.length - 1; i >= 0; i--) {if (this.numbers.get(i) > myInteger.getNumbers().get(i))return 1;else if (this.numbers.get(i) < myInteger.getNumbers().get(i))return -1;elsecontinue;}}return 0;}}
}

乘法和除法还没有来得及实现。这里的继承写的比较烂，所以在整数和自然数中有一些重复的代码。

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java整数类和自然数类的简单实现

java整数类和自然数类的简单实现

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