myexception.java

这一些程序都是实验之用

public class MyException extends Exception{
		int IdException;
		public MyException(int IdException){
			this.IdException=IdException;
		}
		public int getnum(){
			return IdException;
		}
}
class Test{
	public void	regist(int num)throws MyException{
				if(num<0){
					System.out.println(num);
					throw new MyException(3);
					
						 }
						 System.out.println("注册人数为　"+num);
						}
	public void tester(){
		try{regist(4);}catch(MyException e){
			System.out.println("注册人数不能为负数请重新输入，异常ID: "+e.getnum());
		}
	}
	public static void main(String args[]){
		Test  test=new Test();
		test.tester();
	}
}