这是什么意思@Override？ [英] What does @Override mean?

问题描述

public class NaiveAlien extends Alien
{

    @Override
    public void harvest(){}

}

我想了解我的朋友的code和我不明白的语法，@覆盖在code。这是什么做的，我们为什么需要编码？
谢谢你。

I was trying to understand my friend's code, and I do not get the syntax, @Override in the code. What does that do and why do we need in coding? Thanks.

推荐答案

这是编译器，让它知道你重写父类的（在Java 6或接口）的方法。一个提示

It's a hint for the compiler to let it know that you're overriding the method of a parent class (or interface in Java 6).

如果编译器检测到没有的功能覆盖，它会提醒你（或错误）。

If the compiler detects that there IS no function to override, it will warn you (or error).

这是非常有用的快速识别错别字或API的变化。假设你想重写父类的方法收获（），但拼 harvset（），你的程序会悄悄地调用基类，没有 @覆盖，你就不会对此有任何警告。

This is extremely useful to quickly identify typos or API changes. Say you're trying to override your parent class' method harvest() but spell it harvset(), your program will silently call the base class, and without @Override, you wouldn't have any warning about that.

同样的，如果你使用一个库，并在库的版本2，收获（）已被修改为采取一个整数参数，您将不再覆盖它。同样， @覆盖会很快告诉你。

Likewise, if you're using a library, and in version 2 of the library, harvest() has been modified to take an integer parameter, you would no longer override it. Again, @Override would quickly tell you.

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