清除 JFrame 的组件并添加新组件

Clear components of JFrame and add new components(清除 JFrame 的组件并添加新组件)

问题描述

我有一个 JFrame，它有一些选项.当按下 OK 按钮时，我想要相同的 JFrame 清除内容并添加新内容.我已经尝试过了，但问题是弹出了新的 JFrame.我做错了什么?

I have a JFrame, which have some options. When OK button is pressed i want the same JFrame to clear the contents and add new contents. I have tried it but the problem is new JFrame is popped out. What am I doing wrong?

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.*;

public class GuiFrame extends JFrame {

    final JFrame f = new JFrame("Test");

    public void Starter(){
        ImageIcon img = new ImageIcon("C:\Users\neal\Desktop\no.png");
        f.setIconImage(img.getImage());
        ButtonGroup group = new ButtonGroup();
        final JRadioButton Acess = new JRadioButton("Acess");
        final JRadioButton Chat = new JRadioButton("Chat");
        group.add(Acess);
        group.add(Chat);
        f.setSize(400,100);
        f.setLocationRelativeTo(null);
        JButton OptionOk = new JButton("OK");

Label option = new Label("Choose a Option");

        final Container content = f.getContentPane();
        content.setBackground(Color.white);
        content.setLayout(new FlowLayout());

        content.add(option);
        content.add(Acess);
        content.add(Chat);
        content.add(OptionOk);
          f.setVisible(true);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

              OptionOk.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e) {


                try {
                    new GuiFrame().Initiate();
                } catch (UnknownHostException ex) {
                    Logger.getLogger(GuiFrame.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
              });
    }

    public void Initiate() throws UnknownHostException {

        f.removeAll();
        ButtonGroup group = new ButtonGroup();

        final JRadioButton ButtonServer = new JRadioButton("Server");
        final JRadioButton ButtonClient = new JRadioButton("Client");
        group.add(ButtonServer);
        group.add(ButtonClient);

        f.setSize(400, 100);
        f.setLocationRelativeTo(null);
        InetAddress thisIp = InetAddress.getLocalHost();

        ImageIcon img = new ImageIcon("C:\Users\neal\Desktop\no.png");
        f.setIconImage(img.getImage());
        Label lip = new Label("Your IP is : " + thisIp.getHostAddress());
        Label setup = new Label("Setup as ");
        JButton ButtonOk = new JButton("OK");

        final Container content = f.getContentPane();
        content.setBackground(Color.white);
        content.setLayout(new FlowLayout());
        content.add(lip);
        content.add(setup);
        content.add(ButtonServer);
        content.add(ButtonClient);
        content.add(ButtonOk);
        f.setVisible(true);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) throws UnknownHostException {

        GuiFrame gf = new GuiFrame();
        gf.Starter();
    }
}

推荐答案

解决方案很简单:使用 CardLayout 并让这个布局管理器为您完成所有繁重的工作.有关如何执行此操作的详细信息，请参阅教程:如何使用卡片布局

The solution is simple: use a CardLayout and let this layout manager do all the heavy lifting for you. For more details on how to do this, please see the tutorial: How to use CardLayout

至于您的代码，请注意，您实际上是在启动时创建 2 个 JFrame，如果按下 JButton，则会创建另外两个:

As for your code, please note that you are actually creating 2 JFrames when it starts and two more if the JButton is pushed:

GuiFrame 类本身扩展了 JFrame，但它似乎是一个您从不使用的 JFrame，因此被浪费了，但它仍然是在程序启动时创建的，并且无论何时创建 GuiFrame 实例，例如按下按钮时.然后在这个类中你创建另一个 JFrame f，一个在程序启动时，再一次在按钮按下时，我不认为这是你想要做的.

The GuiFrame class itself extends JFrame, but it appears to be a JFrame that you never use and thus is wasted, but it is created nonetheless on program start up and whenever GuiFrame instance is created, such as when the button is pressed. Then inside of this class you create another JFrame f, one on program start up and once again on button press, and I don't think that this is what you want to do.

因此，请更改您的代码，以便该类不扩展 JFrame，并且不要在按钮的 ActionListener 中创建该类的新实例.而是使用 CardLayout 来交换视图.

So change your code so that the class does not extend JFrame, and don't create a new instance of the class in your buttons' ActionListener. Instead use a CardLayout to swap views.

例如:

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;

public class GuiFrame {

   private static final String FIRST_PANEL = "First Panel";
   private static final String SECOND_PANEL = "Second Panel";
   final JFrame f = new JFrame("Test");
   private CardLayout cardLayout = new CardLayout();
   private JPanel content;

   public void Starter() {
      f.setSize(400, 100);
      f.setLocationRelativeTo(null);
      JButton OptionOk = new JButton("OK");

      Label option = new Label("Choose a Option");

      content = (JPanel) f.getContentPane();
      content.setLayout(cardLayout);

      JPanel firstPanel = new JPanel();
      firstPanel.setBackground(Color.white);
      firstPanel.setLayout(new FlowLayout());

      firstPanel.add(option);
      firstPanel.add(OptionOk);

      content.add(firstPanel, FIRST_PANEL);
      content.add(createSecondPanel(), SECOND_PANEL);
      f.setVisible(true);
      f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

      OptionOk.addActionListener(new ActionListener() {

         public void actionPerformed(ActionEvent e) {

            cardLayout.show(content, SECOND_PANEL);

         }
      });

   }

   private JPanel createSecondPanel() {
      JPanel secondPanel = new JPanel();
      secondPanel.add(new JButton(new AbstractAction("Go Back") {
         public void actionPerformed(ActionEvent e) {
            cardLayout.show(content, FIRST_PANEL);
         }
      }));
      return secondPanel;
   }


   public static void main(String[] args) {

      GuiFrame gf = new GuiFrame();
      gf.Starter();
   }

}

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