自定义异常——《Thinking in Java》随笔026

//: Inheriting.java
package cn.skyfffire;
/**
 * 自定义异常
 *
 * user: skyfffire
 * time: 下午4:04:58
 */
class MyException extends Exception {
    private static final long 
        serialVersionUID = -7818673878626777238L;
    public MyException(){}
    
    public MyException(String msg) {
        super(msg);
    }
}

public class Inheriting {
    // 方法f选择不带参数的构造器初始化自定义异常
    public static void f() throws MyException {
        System.err.println("Throwing MyException from f():");
        
        throw new MyException();
    }
    
    // 方法g选择带参数的构造器初始化自定义异常, 说明异常来源
    public static void g() throws MyException {
        System.err.println("Throwing MyException form g()");
        
        throw new MyException("Originated in g()");
    }
    
    public static void main(String[] args) {
        try {
            f();
        } catch (MyException e) {
            e.printStackTrace();
        }
        
        // MyException是‘可继续异常’
        // 所以在调用f方法抓住异常时, 也可以在此时再次执行g方法
        try {
            g();
        } catch (MyException e) {
            e.printStackTrace();
        }
    }
}

///:~