为什么我们在setter方法中使用'this'而不在getter方法中使用? [英] Why do we use 'this' in setter method but not in getter method?

问题描述

例如，在以下代码中:

private int id;

public void setID(int ID) {
    this.id = ID;
}

public void getID() {
    return id;
}

我们为什么不在getter函数中说return this.id或相反在setter函数中说id = ID?还有this实际必要吗?我的意思是，不是通过对象(例如obj.setid(1)或obj.getid())调用函数吗?如果我不使用this关键字，它会以不同的方式工作吗?

Why don't we say return this.id in the getter function or conversely say id = ID in the setter function? Also is this actually necessary? I mean, aren't the functions called through an object, say obj.setid(1) or obj.getid()? Will it work differently if I don't use the this keyword?

推荐答案

当变量名相同时，您需要使用this.是要区分它们.

You need to use this when the variable names are the same. It is to distinguish between them.

public void setID(int id) {
    this.id = id;
}

当删除this时，以下内容仍将起作用.这是因为它们的名称不同.

The following will still work when this is removed. It is because their names are not the same.

public void setID(int ID) {
    id = ID;
}

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