java - 如何从另一个窗口将项目添加到 JList

Question

我有 2 个窗口。一个有一个空的 JList，另一个有一个按钮。所以我想每当按下按钮时都将该值添加到列表中。这是我的代码，但尚未完成:

窗口 1

final DefaultListModel<String> favouriteNames = new DefaultListModel<String>();
JList namesList = new JList(favouriteNames);

窗口 2

public class button extends JFrame {

private JList namesList;
private DefaultListModel<String> favouriteNames;

this.namesList = namesList;

 JButton addThis = new JButton("Add");
 addThis.addActionListener(new ActionListener(){
   public void actionPerformed(ActionEvent e) {
          favouriteNames.addElement("Jack");
   }
 });
}
}

Answer 1

在构造函数中将 DefaultListModel 的实例传递给窗口 2。

编辑添加:以下是在构造函数中传递实例的方法。

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.DefaultListModel;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;

public class ButtonFrame implements Runnable {

    private JFrame              frame;

    private DefaultListModel    favouriteNames;

    public ButtonFrame(final DefaultListModel favouriteNames) {
        this.favouriteNames = favouriteNames;
    }

    @Override
    public void run() {
        frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JButton addThis = new JButton("Add");
        addThis.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                favouriteNames.addElement("Jack");
            }
        });

        frame.add(addThis);
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new ButtonFrame(new DefaultListModel()));
    }

}