Java 中构建自己的异常类（二）

创建UserDeletedException.java文件，内容为：
/**
 *
 */
package com.test.my;

/**
 * @author 苏显斌
 *
 */
public class UserDeletedException extends Exception {
 private static final long serialVersionUID = -4170867320856684404L;

 public UserDeletedException() {
  super("用户已经被删除!");
 }

 public UserDeletedException(String msg) {
  super(msg);
 }

 public String toString() {
  return super.toString();
 }
}

---

创建UserNotFoundException.java文件，内容为：
/**
 *
 */
package com.test.my;

 

/**
 * @author 苏显斌
 *
 */
public class UserNotFoundException extends Exception {
 private static final long serialVersionUID = 125267836539588415L;

 public UserNotFoundException() {
  super("无法找到用户!");
 }

 public UserNotFoundException(String msg) {
  super(msg);
 }

 public String toString() {
  return super.toString();
 }
}

 

---

 

创建testc.java文件，内容为：
package com.test.my;

public class testc {

 /**
  * @param args
  */
 public static void main(String[] args) {
  try {
   catchException(7);
  } catch (UserDeletedException delEx) {
   System.out.println(delEx.toString());
   System.out.println("捕获了用户被删除异常！");
  } catch (UserNotFoundException notFoundEx) {
   System.out.println(notFoundEx.toString());
   System.out.println("捕获了用户不存在异常！");
  } catch (Exception e) {
   System.out.println(e.toString());
   System.out.println("捕获了未知的异常！");
  }
 }

 public static void catchException(int number) throws Exception {
  if (number > 5)
   throw new UserDeletedException();
  else if (number < -5)
   throw new UserNotFoundException();
  else
   throw new Exception("未知的异常！");
 }

}