Ctrl + Ait + T

异常处理

package com.oop.demo01;

public class Outer {


    public static void main(String[] args) {
        int a = 1;
        int b = 0;
        try {
//            System.out.println(a / b);
           if(b == 0) {
               throw new ArithmeticException();
           }
        } catch (Error e) {
            System.out.println("Error!!!");
            throw new RuntimeException(e);
        } catch (Exception e) {
            System.out.println("Exception!!!");
        } catch (Throwable e) {
            System.out.println("Throwable!!!");
        } finally {
            System.out.println("1111");
        }

    }

    public static void a() {Outer.b();};
    public static void b() {Outer.a();};
}

package com.oop.demo01;

public class Outer {


    public static void main(String[] args) {
        int a = 1;
        int b = 0;

        try {
            divide(a, b);
        } catch (ArithmeticException e){
            e.printStackTrace();
        }

    }

    public static void a() {Outer.b();};
    public static void b() {Outer.a();};

    public static void divide(int a, int b) throws ArithmeticException {
        if(b == 0 ) {
            throw new ArithmeticException();
        }
    }
}

自定义异常

package com.oop.demo01;

public class MyException extends Exception{

    private int detail;
    public MyException(int a) {
        this.detail = a;
    }

    @Override
    public String toString() {
        return "MyException{" +
                "detail=" + detail +
                '}';
    }

    //toString
}

package com.oop.demo01;

public class Test {
    static void test(int a) throws MyException{
        System.out.println("argument: " + a);

        if(a > 10) {
            throw new MyException(a);
        } else {
            System.out.println("OK!!!");
        }
    }

    public static void main(String[] args) {
        try {
            test(11);
        } catch (MyException e) {
            System.out.println("MyException + " + e);
        }
    }
}