在Java / Android中引发自定义异常 [英] Throw custom Exceptions in Java/Android

问题描述

我正在开发一个自定义Exception类，其中具有以下构造函数：

I'm developing a custom Exception class, in which I have the following constructors:

public class UserException extends Exception
{
    string message;
    public UserException() {
        super();
    }

    public UserException(String message, Throwable cause)
    {
        super(message, cause);

        this.cause = cause;
        this.message = message;
    }
}

我创建了一个新的自定义异常，如下所示： / p>

And I create a new custom exception like this:

private Camera.PreviewCallback SetPreviewCallBack() throws UserException {
    .......
    // Something went wrong
    throw new UserException("Something failed.", new Throwable(String.valueOf(UserExceptionType.CaptureFailed)));
 }

但是当我插入时，抛出新的UserException（。 ..）告诉我用 try / catch 包围它！！那不是主意，不是吗？我想在需要抛出自定义异常时抛出它们，而不用更多的 try / catch 替代新异常

But when I insert my throw new UserException(...) it tells me to surround it with try/catch!! That's not the idea, isn't it? I want to throw custom exceptions when I need them to be thrown, without surronding my new Exceptions with more try/catch clauses.

那么，我在做什么错呢？我误会了什么？

So, what I'm doing wrong? What I'm misunderstanding?

推荐答案

除了Eran的答案，您还可以使自定义Exception扩展 RuntimeException ，不需要捕获。

In addition to Eran's answer, you could also make your custom Exception extend RuntimeException, which does not need to be caught.

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