如何编写自定义异常？ [英] How can I write custom Exceptions?

问题描述

如何创建新的异常与预制类型不同？

How can I create a new Exception different from the pre-made types?

public class InvalidBankFeeAmountException extends Exception{
    public InvalidBankFeeAmountException(String message){
        super(message);
    }
 }

它将显示 InvalidBankFeeAmountException的警告

It will show the warning for the InvalidBankFeeAmountException which is written in the first line.

推荐答案

所有你需要做的是创建一个新的 class ，并且它有扩展异常。

All you need to do is create a new class and have it extend Exception.

如果你想要一个异常未被选中，您需要扩展RuntimeException 。

If you want an Exception that is unchecked, you need to extend RuntimeException.

注意：一个选中的异常是一个需要您围绕 Exception try / catch block或者有一个'$ code> throws '在方法声明中。 （如 IOException ）未选中异常可能会像检查异常，但是您不需要以任何方式显式处理它们（ IndexOutOfBoundsException ）。

Note: A checked Exception is one that requires you to either surround the Exception in a try/catch block or have a 'throws' clause on the method declaration. (like IOException) Unchecked Exceptions may be thrown just like checked Exceptions, but you aren't required to explicitly handle them in any way (IndexOutOfBoundsException).

例如：

public class MyNewException extends RuntimeException {

    public MyNewException(){
        super();
    }

    public MyNewException(String message){
        super(message);
    }
}

这篇关于如何编写自定义异常？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！