jcombobox如何在java中的另一个选项卡中执行按钮操作时更新ComboBox

Question

我有一个JTabbedPane，里面有两个面板：panel1和panel2。在panel1中执行操作时，我想更新位于panel2中的JComboBox

在panel1中，我有以下代码：

JPanel panel1 = new JPanel();
tabbedPane.addTab("panel1", null, panel1, null);
panel1.setLayout(null);

//some code

JButton btnSubmit = new JButton("Submit");
btnSubmit.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {    

        // ?
    }
});
btnSubmit.setBounds(12, 155, 150, 25);
panel1.add(btnSubmit);

面板2中是我的JComboBox：

JPanel panel2 = new JPanel();
tabbedPane.addTab("panel2", null, panel2, null);
panel2.setLayout(null);
//some code
final JComboBox comboBox_2 = new JComboBox();
comboBox_2.setBounds(12, 240, 200, 24);
panel2.add(comboBox_2);

我该怎么做

Answer 1

下面是一个快速而肮脏的实现

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

import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;

public class Window extends JFrame {

    JTabbedPane jtp = new JTabbedPane();
    JPanel panel1 = new JPanel();
    JPanel panel2= new JPanel();
    JComboBox<String> comboBox_2 = new JComboBox<String>();

    ActionListener buttonListener = new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            comboBox_2.addItem("abc");
            comboBox_2.addItem("def");

        }
    };


    public Window() {

        initP1();
        initP2();
        initJTP();

    }

    public void initJTP(){
        jtp.add(panel1);
        jtp.add(panel2);
        this.add(jtp);
    }

    public void initP1(){
         JButton btnSubmit = new JButton("Submit");
         btnSubmit.setBounds(12, 155, 150, 25);
         btnSubmit.addActionListener(buttonListener);
         panel1.add(btnSubmit);
    }


    public void initP2(){
        comboBox_2.setBounds(12, 240, 200, 24);
        panel2.add(comboBox_2);

    }


       /**
     * Create the GUI and show it.  For thread safety,
     * this method should be invoked from the
     * event-dispatching thread.
     */
    private static void createAndShowGUI() {

        Window frame = new Window();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);


        //Display the window.
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }

}