Java等效于.NET System.InvalidOperationException [英] Java equivalent to .NET System.InvalidOperationException

问题描述

我不熟悉Java的异常包和.NET的异常包。我处于一种情况，如果在C＃中编程，我会抛出一个 System.InvalidOperationException 。

在创建我自己的 java.lang.RuntimeException 子类之前，我需要知道是否有类似的异常类型我应该抛出Java。

确切的情况是：

我的类是一个值对象， int intValue（）方法返回一个int。然而，在某些情况下，当前值不能作为int提供，因此此类还提供了一个 boolean isInteger（），以允许API用户知道何时 intValue（）可以安全地调用。

如果调用者调用 intValue（）当 isInteger（）是 false 时，应抛出异常。

问题是：什么类型的异常？

我知道这个问题可能没有em>正确的答案，但考虑到我没有很多设计Java API的经验，我想从其他Java开发人员了解他们在这种情况下会被抛出什么。

谢谢

解决方案

抛出一个 IllegalStateException ：

表示方法已被调用
在非法或不适当的时间。
换句话说，Java环境
或Java应用程序对于所请求的
操作不在
适当的状态。

I am not as familiar with Java's exception packages as with those of .NET. I'm in a situation where, if programming in C#, I would throw a System.InvalidOperationException.

Before creating my own java.lang.RuntimeException subclass, I need to know if there is a similar exception type I should throw in Java.

The exact scenario is:

My class is a value object that provides an int intValue() method, returning an int. However, in some situations, the current value cannot be provided as an int, so this class also provides a boolean isInteger() to allow API users to know when intValue() can be safely invoked.

If a caller calls intValue() when isInteger() is false, an exception should be thrown.

And the question is: What type of exception?

I know that this question might not have a correct answer, but considering that I don't have lots of experience designing Java APIs, I want to know from other Java developers what they would expect to be thrown in this scenario.

thanks

解决方案

Throw an IllegalStateException:

Signals that a method has been invoked at an illegal or inappropriate time. In other words, the Java environment or Java application is not in an appropriate state for the requested operation.

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