什么是Java中的@Override？ [英] What is @Override for in Java?

问题描述

可能重复：

你什么时候使用Java的@Override注释？为什么？

是否有理由用 @Override 注释方法，而不是让编译器检查超类是否有该方法？

Is there any reason to annotate a method with @Override other than to have the compiler check that the superclass has that method?

推荐答案

如您所述，@ Override创建了一个编译时检查，表明正在覆盖某个方法。这对于确保在尝试覆盖时没有愚蠢的签名问题非常有用。

As you describe, @Override creates a compile-time check that a method is being overridden. This is very useful to make sure you do not have a silly signature issue when trying to override.

例如，我看到以下错误：

For example, I have seen the following error:

public class Foo {
  private String id;
  public boolean equals(Foo f) { return id.equals(f.id);}
}

此类编译为已编写，但将@Override标记添加到equals方法将导致编译错误，因为它不会覆盖Object上的equals方法。这是一个简单的错误，但它甚至可以逃脱经验丰富的开发人员的眼球

This class compiles as written, but adding the @Override tag to the equals method will cause a compilation error as it does not override the equals method on Object. This is a simple error, but it can escape the eye of even a seasoned developer

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