java 第51节 定义自己的异常

package com.java1995;
/**
 * 定义自己的异常类
 * @author Administrator
 *
 */
public class TestException {
    
    public static void main(String[] args) {
        MyException me=new MyException("自己的异常类");
        System.out.println(me.getMessage());
        System.out.println(me.toString());
    }

}

class MyException extends Exception{
    
    public MyException(){
        
    }
    
    public MyException(String msg){
        super(msg);
    }
}

package com.java1995;
/**
 * 调用自己的异常
 * @author Administrator
 *
 */
public class AgeTest {
    
    public static void main(String[] args) {
        try {
            ageLevel(1000);
        } catch (IllegalAgeException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    
    static String ageLevel(int age) throws IllegalAgeException{
        if(age>= 10&& age<18){
            return "少年";
        }
        else if(age>18&&age<=30){
            return "青年";
        }else if(age>30&&age<=60){
            return "中年";
        }else if(age>60&&age<=120){
            return "老年";
        }else{
            //抛出异常
            throw new IllegalAgeException("非法的年龄！！！");
        }
    }
    
}

/**
 * 定义自己的异常类
 * @author Administrator
 *
 */
class IllegalAgeException extends Exception{
    
    public IllegalAgeException(String msg){
        super(msg);
    }
}