每天一点儿java---继承exception类来实现自己的异常类

来源：互联网发布：python迭代器是什么编辑：程序博客网时间：2024/05/16 05:52
package prac_1;/** * <p>Title: 捕获异常和实现自己的异常类</p> * <p>Description: 通过继承Exception类来实现自己的异常类。并使用try－catch来捕获这个异常。</p> * <p>Copyright: Copyright (c) 2014</p> * <p>Filename: </p> * @author 王海涛 * @version 0.1 */class MyException extends Exception {   public MyException() {}  public MyException(String msg) {    super(msg);  }  public MyException(String msg, int x) {    super(msg);    i = x;  }  public int val() { return i; }  private int i;}public class ExceptionDemo {/** *<br>方法说明：使用MyException类中默认的构造器 */  public static void a() throws MyException {    System.out.println(      "Throwing MyException from a()");    throw new MyException();//抛出异常，结束方法  }/** *<br>方法说明：使用MyException类中带信息的构造器 */  public static void b() throws MyException {    System.out.println(      "Throwing MyException from b()");    throw new MyException("error in b ()");  }/** *<br>方法说明：使用了MyException中有编码的构造器 */  public static void c() throws MyException {    System.out.println(      "Throwing MyException from c()");    throw new MyException(      "error in c()", 404);  }  public static void main(String[] args) {    try {      a();    } catch(MyException e) {    System.out.println( "Error="+e.getMessage());    }    try {      b();    } catch(MyException e) {    System.out.println( "Error="+e.getMessage());      //e.toString();    }    try {      c();    } catch(MyException e) {    System.out.println( "Error="+e.getMessage());      e.printStackTrace();      System.out.println("error code: " + e.val());    }  }} //end :)
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