Java 认识异常并掌握使用

package com.lding.exception;

import java.util.Scanner;

/**
 * @program: Chat
 * @description:
 * @author: 王丁
 * @date: 2021-09-28 10:49
 **/
public class TryDemoOne {
    public static void main(String[] args) {

        //要求:定义两个整数，接受用户键盘输入，输出两数之商
        Scanner input = new Scanner(System.in);
        System.out.println("=======运算开始========");
        try { //包裹可能出错的代码
            System.out.print("请输入第一整数:");
            int one = input.nextInt();
            System.out.print("请输入第二个整数:");
            int two = input.nextInt();
            System.out.println("one和two的商是:" + (one / two));
        }catch (Exception e){//捕获异常
            e.printStackTrace();//打印出错的位置
            System.out.println("程序出错了~~~~~");//出错后执行的语句
        }
        finally {//无论是否出错都一定会执行的语句
            System.out.println("======运算结束========");
        }
    }

}

package com.lding.exception;

/**
 * @program: Chat
 * @description:
 * @author: 王丁
 * @date: 2021-09-28 11:22
 **/
public class AgeException extends Exception {
    public AgeException(){
        super("年龄不能为负数");
    }
}

package com.lding.exception;

/**
 * @program: Chat
 * @description:
 * @author: 王丁
 * @date: 2021-09-28 11:23
 **/
public class ExceptionTest {
    public static void testage(int age) throws AgeException {
        if(age<0){
            throw new AgeException();
        }
    }
    public static void main(String[] args) {
        int age=-1;
        try {
            testage(age);
        } catch (AgeException e) {
            e.printStackTrace();
        }
    }
}