JAVA-异常处理

https://blog.csdn.net/michaelgo/article/details/82790253

Error类及其子类，RuntimeException类及其子类的异常不需要一定try catch包起来

Exception类及其子类（排除RuntimeException类及其子类）的一定要用try catch包起来

 

如下，可以编译通过

package exception;

public class test1 {
    public static void main(String[] args) {
        a();
    }
    
    static void a() throws a{
        a b=new a("异常了");
        throw b;
    }

}

class a extends RuntimeException{
    //异常信息
    private String message;

    //构造函数
    public a(String message){
        super(message);
        this.message = message;
    }

}

如下，编译报错

package exception;

public class test1 {
    public static void main(String[] args) {
        a();
    }
    
    static void a() throws a{
        a b=new a("异常了");
        throw b;
    }

}

class a extends Exception{
    //异常信息
    private String message;

    //构造函数
    public a(String message){
        super(message);
        this.message = message;
    }

}