java - 在 Java 中访问内部类的包含类

Question

这就是我现在正在做的。有没有更好的方法来访问父类(super class)？

public class SearchWidget {
    private void addWishlistButton() {
        final SearchWidget thisWidget = this;
        button.addClickHandler(new ClickHandler() {
            public void onClick(ClickEvent event) {
                // A better way to access the super class?
                // something like "this.super" ...?
                workWithWidget(thisWidget);
            }
        }
    }
}

我正在使用 Google Web Toolkit 进行编程，但我认为这确实是一个通用的 Java 问题。

Answer 1

您可以使用所谓的合格this。

JLS 15.8.4. Qualified This

Any lexically enclosing instance can be referred to by explicitly qualifying the keyword this.

Let C be the class denoted by ClassName. Let n be an integer such that C is the n-th lexically enclosing class of the class in which the qualified this expression appears. The value of an expression of the form ClassName.this is the n-th lexically enclosing instance of this (§8.1.3). The type of the expression is C. It is a compile-time error if the current class is not an inner class of class C or C itself.

在这种情况下，您可以按照 Martijn 的建议进行操作，并使用:

workWithWidget(SearchWidget.this);

引用资料

• JLS 15.8.4. Qualified This
• JLS 8.1.3 Inner Classes and Enclosing Instances

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