Java：使用动作侦听器在该类的对象的另一个类中调用函数

在匿名类中引用事物的一种方法是使用

final

  public static void main(String[] args) {    final Object thingIWantToUse = "Hello";    JButton button = new JButton("Click");    button.addActionListener(new ActionListener() {      @Override public void actionPerformed(ActionEvent e) {        System.out.println(thingIWantToUse);      }    });    Jframe frame = new Jframe();    frame.setLayout(new FlowLayout());    frame.add(button);    frame.setDefaultCloseOperation(Jframe.EXIT_ON_CLOSE);    frame.pack();    frame.setVisible(true);  }

或者，您可以访问封闭类型的成员（变量或方法）：

public class ActionListenerDemo2 {  private final Jframe frame = new Jframe();  private Object thingIWantToUse = "Hello";  public ActionListenerDemo2() {    JButton button = new JButton("Click");    button.addActionListener(new ActionListener() {      @Override public void actionPerformed(ActionEvent e) {        thingIWantToUse = "Goodbye";        System.out.println(thingIWantToUse);      }    });    frame.setLayout(new FlowLayout());    frame.add(button);    frame.setDefaultCloseOperation(Jframe.EXIT_ON_CLOSE);    frame.pack();    frame.setVisible(true);  }  public static void main(String[] args) {    new ActionListenerDemo2().frame.setVisible(true);  }}