笔试总共有四道题

1、计算一个航班的飞行时间，通过键盘输入两个数，分别代表航班起飞时间和到达时间(不用考虑跨天的情况)。比如一个航班起飞是7:30，到达是14:20，则输入730和1420，通过程序，则要求输出内容为：“航班飞行时间为6小时50分钟”。

这道题猛一眼看上去准备用Java的calendar来做，但是转念一想，简单减法也可以

import java.util.Scanner;

public class Main {

public static void main(String[] args) {

try {

Scanner scanner = new Scanner(System.in);

Integer i = scanner.nextInt();

Integer j = scanner.nextInt();

//小时

Integer h1 = i / 100;

Integer h2 = j / 100;

//分钟

Integer m1 = i % 100;

Integer m2 = j % 100;

if (m2 - m1 < 0){

Integer h = h2-h1-1;

Integer m = m2-m1+60;

System.out.println(“航班飞行时间为”+h+“小时”+m+“分钟”);

}else {

Integer h = h2-h1;

Integer m = m2-m1;

System.out.println(“航班飞行时间为”+h+“小时”+m+“分钟”);

}

}catch (Exception e){

System.out.println(“您的输入有误，请检查！”);

}

}

}

2、将一个Student对象使用jdbc保存到mysql数据库，要求写出数据库建表脚本以及写出使用jdbc插入数据库的java代码。 说明： Student包含三个属性(姓名、年龄、出生年月)，如(张三、20、19860101) mysql数据库连接信息如下： driverclass: com.mysql.jdbc.Driver connection URL: jdbc:mysql://127.0.0.1:3306/test username:root password:000000

这个题就是考察简单的jdbc插入操作

package test;

import java.sql.*;

/**

@author zsh

@company wlgzs

@create 2019-03-21 20:19

@Describe JDBCTest，PreparedStatement与Statement区别

*/

public class JDBCTest {

class Student{

private String name;

private Integer age;

private String birthday;

public Student(String name, Integer age, String birthday) {

this.name = name;

this.age = age;

this.birthday = birthday;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public Integer getAge() {

return age;

}

public void setAge(Integer age) {

this.age = age;

}

public String getBirthday() {

return birthday;

}

public void setBirthday(String birthday) {

this.birthday = birthday;

}

}

public void t() throws ClassNotFoundException, SQLException {

//1 加载数据库驱动

Class.forName(“com.mysql.jdbc.Driver”);

//2 获取数据库连接

String url = “jdbc:mysql://127.0.0.1:3306/test”;

String user = “root” ;

String password = “000000” ;

Connection conn = DriverManager.getConnection(url, user, password);

Student student = new Student(“张三”,20,“19860101”);

//3 创建一个Statement

String sql = “insert into students (name,age,birthday) values(?,?,?)” ;

PreparedStatement pstmt;

try {

pstmt = (PreparedStatement) conn.prepareStatement(sql);

pstmt.setString(1, student.getName());

pstmt.setInt(2, student.getAge());

pstmt.setString(3, student.getBirthday());

pstmt.executeUpdate();

pstmt.close();

conn.close();

} catch (SQLException e) {

e.printStackTrace();

}finally {

conn.close();

}

}

}

3、要求使用javax.servlet.Filter实现统计某个用户访问了多少次tomcat服务器的功能。其中用户已经登录，登录信息已经放到session，key是USER_ID，其中用户登录的访问请求不需要进行统计。

这个题有点小疑问，

import java.io.;

import javax.servlet.;

import javax.servlet.http.;

import java.util.;

public class TestFilter implements Filter{

private int count;

public void init(FilterConfig config)

throws ServletException{

// Reset hit counter.

count = 0;

}

public void doFilter(ServletRequest request,

ServletResponse response,

FilterChain chain)

throws java.io.IOException, ServletException {

HttpSession session = request.getSession(false);

User user = session.getAttribute(“USER_ID”);

if (user != null){

count++;

}

chain.doFilter(request,response);

}

public void destroy() {

System.out.println(“访问次数 :”+ count );

count = 0;

}

}

4、使用4个子线程求出1到100的和并答应。每个子线程计算25个数

这道题多个解法，我这里使用最简单的，开四个线程去执行

package test;

/**

@author zsh

@site qqzsh.top

@company wlgzs

@create 2019-04-29 19:56

@Description

*/

public class FourThread {

static int sum11 = 0;

static int sum12 = 0;

static int sum13 = 0;

static int sum14 = 0;

static int sum = 0;

public static void main(String[] args) throws InterruptedException {

new Thread(){

public void run() {

int sum1=0;

for(int i=1;i<=25;i++){

sum1+=i;

}

sum11 += sum1;

}

}.start();

new Thread(){

public void run() {

int sum2 = 0;

for (int i = 26; i <= 50; i++) {

sum2 += i;

}

sum12 += sum2;

}

}.start();

new Thread(){

public void run() {

int sum3 = 0;

for (int i = 51; i <= 75; i++) {

sum3 += i;

}

sum13 += sum3;

}

}.start();

new Thread(){

public void run() {

int sum4 = 0;

for (int i = 76; i <= 100; i++) {

sum4 += i ;

}

sum14 = sum4;

}

}.start();

Thread.sleep(100);

sum = sum11 + sum12 + sum13 + sum14;

System.out.println( "sum: " + sum);

}

}

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