java异常学习

异常学习

package com.exception;

public class Test {
    public static void main(String[] args) {
        int a = 1;
        int b = 0;
        try {//try监控区域
            System.out.println(a / b);
        } catch (Exception e) {//catch 捕获异常
            System.out.println("除数不能为零");
        } finally {//处理善后
            System.out.println("finally");
        }


    }
}

输出结果

除数不能为零
finally

package com.exception;

public class Test {
    public static void main(String[] args) {

        try {
            new Test().test(1, 0);
        } catch (ArithmeticException e) {
            e.printStackTrace();
        } finally {
        }


    }

    //假设这个方法中，处理不了这个异常，就在方法上抛出这个异常
    public void test(int a, int b) throws ArithmeticException {
        if (b == 0) {
            throw new ArithmeticException();//主动抛出异常 ,一般在方法中使用
        }
    }
}

package com.exception;

public class Test02 {
    public static void main(String[] args) {
        int a = 1;
        int b = 0;
//ctrl+alt+t
        try {
            System.out.println(a / b);
        } catch (Exception e) {
            System.exit(1);//
            e.printStackTrace();//打印错误的栈信息
        }
    }
}