【JAVA应用】自定义Exception异常类

写出自定义异常类，继承Exception类

package cn.edu.error;

public class MyException extends Exception{
  private int id;
  public MyException(String message,int id){
    super(message);
    this.id=id;
  }
  
  public int getId(){
    return this.id;
  }
}

实验类TestMyEx.java: 

package cn.edu.error;


public class TestMyEx {
  //<span style="font-family: Arial, Helvetica, sans-serif;">登记</span><span style="font-family: Arial, Helvetica, sans-serif;">学生人数的小程序</span>
  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.println
      ("登记失败，出错类型码="+e.getId());
      e.printStackTrace();
    }
    System.out.println("操作结束");
  }
  public static void main(String[] args) {
    TestMyEx tme=new TestMyEx();
    tme.manager();
  }
  
}

结果：

登记人数100
操作结束

将regist(100);改为regist(-100);

结果变为：

登记失败，出错类型码=3
cn.edu.error.MyException: 人数为负值，不合理
  at cn.edu.error.TestMyEx.regist(TestMyEx.java:7)
  at cn.edu.error.TestMyEx.manager(TestMyEx.java:13)
  at cn.edu.error.TestMyEx.main(TestMyEx.java:23)
操作结束