Anonymous Inner Class (匿名内部类)

匿名类本身就是通过继承类或者接口来实现的。但是不能再显式的extends 或者implements了。
举个例子：
JFrame frame = new JFrame();
我们为frame添加窗口事件可以采用如下两种方式：

Java code

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 frame.addWindowListener(new WindowListener() {

            public void windowOpened(WindowEvent e) {
                throw new UnsupportedOperationException("Not supported yet.");
            }

            public void windowClosing(WindowEvent e) {
                throw new UnsupportedOperationException("Not supported yet.");
            }

            public void windowClosed(WindowEvent e) {
                throw new UnsupportedOperationException("Not supported yet.");
            }

            public void windowIconified(WindowEvent e) {
                throw new UnsupportedOperationException("Not supported yet.");
            }

            public void windowDeiconified(WindowEvent e) {
                throw new UnsupportedOperationException("Not supported yet.");
            }

            public void windowActivated(WindowEvent e) {
                throw new UnsupportedOperationException("Not supported yet.");
            }

            public void windowDeactivated(WindowEvent e) {
                throw new UnsupportedOperationException("Not supported yet.");
            }
        });

这个匿名类就是实现了接口WindowListener
或者：

Java code

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frame.addWindowListener(new WindowAdapter() {});

上面这个匿名类就是继承了ＷｉｎｄｏｗＡｄａｐｔｅｒ这个抽象类。