1.編譯時異常

2.執行時異常

• 不處理異常

package cn.yang37.exception;

/**
 * @Class: Demo1
 * @Author: Yiang37
 * @Date: 2020/10/14 23:37
 * @Description:
 */
public class Demo1 {
    public static void main(String[] args) {
        for (int i = 5; i >=-3 ; i--) {
            System.out.println("now i is "+i+": "+getRes(5,i));
        }
    }

    static String getRes(int a, int b){
        return ""+(a/b);
    }
}
 

now i is 5:	1
now i is 4:	1
now i is 3:	1
now i is 2:	2
now i is 1:	5
now i is 0:	Exception in thread "main" java.lang.ArithmeticException: / by zero
	at cn.yang37.exception.Demo1.getRes(Demo1.java:19)
	at cn.yang37.exception.Demo1.main(Demo1.java:13)

Process finished with exit code 1

• 做了異常處理

package cn.yang37.exception;

/**
 * @Class: Demo1
 * @Author: Yiang37
 * @Date: 2020/10/14 23:37
 * @Description:
 */
public class Demo1 {
    public static void main(String[] args) {
        for (int i = 5; i >=-3 ; i--) {
            System.out.print("now i is "+i+":\t");
            try {
            System.out.println(getRes(5, i));
            }catch (Exception e){
                System.out.println("本次出現異常");
                e.printStackTrace();
            }
        }
    }

    static String getRes(int a, int b){
        return ""+(a/b);
    }
}
 

now i is 5:	1
now i is 4:	1
now i is 3:	1
now i is 2:	2
now i is 1:	5
now i is 0:	本次出現異常
java.lang.ArithmeticException: / by zero
	at cn.yang37.exception.Demo1.getRes(Demo1.java:23)
	at cn.yang37.exception.Demo1.main(Demo1.java:14)
now i is -1:	-5
now i is -2:	-2
now i is -3:	-1