继承的应用举例-自定义异常类

package com.dxxy.ageException;
//自定义异常类继续超类Exception
public class MyException extends Exception {
//无参构造方法
public MyException(){}
//带有参数的构造方法
public MyException(String message){
super(message);//调用超类的构造方法
}

}

package com.dxxy.ageException;
import javax.swing.*;


public class AgeExceptionTest {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
try{
//弹出一个小对话框，让用户输入年龄数据，使用方法JOptionPane.showInputDialog
/*当用户输入<=0的年龄时抛出异常*/
String ageString = JOptionPane.showInputDialog("Enter your age:");
if (Integer.parseInt(ageString)<0||Integer.parseInt(ageString)==0){
//创建一个带有字符串参数的MyException实例
throw new MyException("Please enter a positive age!");

}

    else{
    JOptionPane.showMessageDialog(null, ageString, "Age", 1);
    System.out.println("you entered age:"+ageString);
}


}
catch(MyException e){
System.out.println(e);
}



}
}