7.17mydefinedexceptionsample.java

JAVA程序设计的源代码

public class MyDefinedExceptionSample {
public static void main (String args[])  {
System.out.println ("\n***Load a user defined exception***") ;
 try {
//创建一个类ThrowExceptionClass 匿名对象，并调用其中的的方法
new ThrowExceptionClass ().throwDefaultException () ;
}
//捕获并处理异常
catch  (MyDefinedException e)  {
System.out.println ("Exception Information:"+ e.getMessage ()) ;
}
System.out.println( "\n***Load another user defined exception***" ) ;
try {
//创建一个类ThrowExceptionClass匿名对象，并调用其中的方法
new ThrowExceptionClass ().throwException ("A user exception is loaded!") ;
}
//捕获并处理异常
catch  (MyDefinedException e)  {
System.out.println ("Exception Information:"+e.getMessage ()) ;
}
}
}

class MyDefinedException extends Exception {
public MyDefinedException ()  {
super ("This is a user defined exception!") ; //调用父类的构造函数
}
public MyDefinedException (String message){
super (message) ; //调用父类的构造函数
}
}

class ThrowExceptionClass {
//抛出缺省参数的异常
public void throwDefaultException ()  throws MyDefinedException {
throw new MyDefinedException () ;
}
//抛出带有参数的异常
public void throwException(String message)  throws MyDefinedException {
throw new MyDefinedException (message) ;
}
}