28 Jan 2018

Java自定义异常

所有异常都必须是 Throwable 的子类
异常分为：检查性异常类 Exception 类，运行时异常类 RuntimeException 类。

自定义异常类：

 public class MyException extends RuntimeException { 
  private static final long serialVersionUID = 1L; 
  //错误编码
  private String errorCode; 
  //消息是否为属性文件中的Key
  private boolean propertiesKey = true; 
  // 构造函数
  public MyException(String message){
      super(message);
  }
  public MyException(String errorCode, String message){
      this(errorCode, message, true);
  }
  public MyException(String errorCode, String message, Throwable cause){
      this(errorCode, message, cause, true);
  }
  public MyException(String errorCode, String message, boolean propertiesKey){
      super(message);
      this.setErrorCode(errorCode);
      this.setPropertiesKey(propertiesKey);
  }
  public MyException(String errorCode, String message, Throwable cause, boolean propertiesKey){
      super(message, cause);
      this.setErrorCode(errorCode);
      this.setPropertiesKey(propertiesKey);
  }
  public MyException(String message, Throwable cause){
      super(message, cause);
  }     
  public String getErrorCode(){
      return errorCode;
  } 
  public void setErrorCode(String errorCode){
      this.errorCode = errorCode;
  } 
  public boolean isPropertiesKey(){
      return propertiesKey;
  } 
  public void setPropertiesKey(boolean propertiesKey){
      this.propertiesKey = propertiesKey;
  }     
 }

使用自定义异常抛出异常信息

public class MyExceptionTest { 
  public static void main(String[] args) {         
       String[] sexs = {"男性","女性","中性"};
       for(int i = 0; i < sexs.length; i++){
           if("中性".equals(sexs[i])){
               throw new MyException("你全家都是中性！");
           }else{
               System.out.println(sexs[i]);
           }
       } 
  }
 }

Java自定义异常

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