j3_30.java

本光盘是《JSP应用教程》的配套光盘

class MyException extends Exception {
   	private int idnumber;
	public MyException(String message, int id) {
		super(message);
		this.idnumber = id;
 	} 
	public int getId() {
		return idnumber;
 	}
}
class Test{
	public void regist(int num) throws MyException {
		if (num < 0) {
			throw new MyException("人数为负值，不合理",3);
		}			
		System.out.println("登记人数"+ num);
	}
	public void manager() {
		try {
			regist(-100);
		} catch (MyException e) {
			System.out.print("登记失败，出错种类："+e.getId());
		}
		System.out.print("本次登记操作结束");
	}
	public static void main(String args[]){
		Test t = new Test();
		t.manager();
	}
}