使用关键字“this”在java中 [英] Using the keyword "this" in java

问题描述

我试图了解java 这个实际上是做什么的。
我一直在阅读Sun的文档，但我仍然模糊这个实际上是什么。

I'm trying to get an understanding of what the the java keyword this actually does. I've been reading Sun's documentation but I'm still fuzzy on what this actually does.

推荐答案

此关键字是对当前对象的引用。

The this keyword is a reference to the current object.

class Foo
{
    private int bar;

    public Foo(int bar)
    {
        // the "this" keyword allows you to specify that
        // you mean "this type" and reference the members
        // of this type - in this instance it is allowing
        // you to disambiguate between the private member
        // "bar" and the parameter "bar" passed into the
        // constructor
        this.bar = bar;
    }
}

考虑它的另一种方式是此关键字就像您用来引用自己的人称代词。其他语言对于相同的概念有不同的词。 VB使用 Me 和Python约定（因为Python不使用关键字，只是每个方法的隐式参数）是使用 self 。

Another way to think about it is that the this keyword is like a personal pronoun that you use to reference yourself. Other languages have different words for the same concept. VB uses Me and the Python convention (as Python does not use a keyword, simply an implicit parameter to each method) is to use self.

如果您要引用本质上属于您的对象，您可以这样说：

If you were to reference objects that are intrinsically yours you would say something like this:

我的胳膊或我的腿

想想这个只是一种类型说我的的方式。因此，伪代码表示如下所示：

Think of this as just a way for a type to say "my". So a psuedocode representation would look like this:

class Foo
{
    private int bar;

    public Foo(int bar)
    {
        my.bar = bar;
    }
}

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