“这个"引用在构造过程中转义? [英] "this" reference escaping during construction?

问题描述

如果我执行以下操作，

final class FooButton extends JButton{
    FooButton(){
        super("Foo");
        addActionListener(new ActionListener(){
            @Override
            public void actionPerformed(ActionEvent e){
                // do stuff
            }
        });
    }
}

我是否让 this 引用隐式转义?

am I letting the this reference implicitly escape?

推荐答案

是的，因为在匿名内部类中你可以这样访问它:

Yes, because in the anonymous inner class you could access it like this:

final class FooButton extends JButton {
    Foo() {
        super("Foo");
        addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                FooButton button = FooButton.this;
                // ... do something with the button
            }
        });
    }
}

匿名ActionListener的代码原则上可以在FooButton对象完全初始化之前调用和使用FooButton.

The code of the anonymous ActionListener could in principle be called and use the FooButton before the FooButton object is fully initialized.

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