Java按钮事件处理程序无法解析

Question

我正在尝试在GUI上设置偶数处理程序。但是，当我声明该类然后在按钮上调用它时，它无法解析？

btnHigher = new JButton("Higher");
    btnHigher.setBounds(190, 110, 75, 50);
    btnHigher.addActionListener(new HigherHandler());
    panel.add(btnHigher);

处理程序类：     class HigherHandler实现ActionListener {

        @Override
        public void actionPerformed(ActionEvent e) {

        }

    }

它只是抛出一个错误： HigherHandler无法解析为类型

Answer 1

btnHigher = new JButton("Higher");
    btnHigher.setBounds(190, 110, 75, 50);
    btnHigher.addActionListener(new HigherHandler());
    panel.add(btnHigher);

以下行可以写成这样，而不是创建一个新类。

 btnHigher.addActionListener(new HigherHandler(){
       // it will ask you to add implemented method here which is action performed method.

}）;