GUI多帧切换

如何解决GUI多帧切换

| 我正在写一个二十一点游戏程序。这是一项我们不使用gui的任务，但是为了获得更多的荣誉，我正在这样做，我创建了两个框架，它们正起作用。在第二帧上，我希望能够在按下按钮时切换回第一帧。我该怎么做呢？第一个窗口.............

import javax.swing.* ;
import java.awt.event.* ;
import java.awt.* ;
import java.util.* ;


public class BlackJackWindow1 extends JFrame implements ActionListener
{
  private JButton play = new JButton(\"Play\");
  private JButton exit = new JButton(\"Exit\");
  private JPanel pane=new JPanel();
  private JLabel lbl ;

  public BlackJackWindow1()
  {
    super();
    JPanel pane=new JPanel();
    setTitle (\"Black Jack!!!!!\") ;
    JFrame frame = new JFrame(\"\");

    setVisible(true);
    setSize (380,260) ;
    setLocation (450,200) ;
    frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE) ;

    setLayout(new FlowLayout());
    play = new JButton(\"Start\");
    exit = new JButton(\"exit\");
    lbl = new JLabel (\"Welcome to Theodores Black Jack!!!!!\");

    add (lbl) ;
    add(play,BorderLayout.CENTER);
    play.addActionListener (this);
    add(exit,BorderLayout.CENTER);
    exit.addActionListener (this);
  }
  @Override
  public void actionPerformed(ActionEvent event)
  {
    // TODO Auto-generated method stub
    BlackJackWindow2 bl = new BlackJackWindow2();
    if (event.getSource() == play)
    {
      bl.BlackJackWindow2();
    }
    else if(event.getSource() == exit){
      System.exit(0);
    }
  }

第二个窗口...

import javax.swing.* ;

import java.awt.event.* ;
import java.awt.* ;
import java.util.* ;

public class BlackJackWindow2 extends JFrame implements ActionListener
{
  private JButton hit ;
  private JButton stay ;
  private JButton back;
  //private JLabel lbl;

  public void BlackJackWindow2() 
  {
    // TODO Auto-generated method stub
    JPanel pane=new JPanel();
    setTitle (\"Black Jack!!!!!\") ;
    JFrame frame = new JFrame(\"\");

    setVisible(true);
    setSize (380,200) ;
    frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE) ;

    setLayout(new FlowLayout());
    hit = new JButton(\"Hit\");  
    stay = new JButton(\"stay\");
    back = new JButton(\"return to main menu\");

    // add (lbl) ;
    add(hit,BorderLayout.CENTER);  
    hit.addActionListener (this) ;
    add(stay,BorderLayout.CENTER);
    stay.addActionListener (this) ;
    add(back,BorderLayout.CENTER);
    back.addActionListener (this) ;
  }

  @Override
  public void actionPerformed(ActionEvent event) 
  {
    // TODO Auto-generated method stub
    BlackJackWindow1 bl = new BlackJackWindow1();
    if (event.getSource() == hit)
    {
      //code for the game goes here i will complete later
    }
    else if(event.getSource() == stay){
      //code for game goes here i will comeplete later.
    }
    else 
    {
      //this is where i want the frame to close and go back to the original.
    }
  }
}

解决方法

第二帧需要参考第一帧，以便可以将焦点设置回第一帧。同样，您的类扩展了JFrame，但它们还在其构造函数中创建其他框架。 ,一些建议：您正在将组件添加到使用FlowLayout的JPanel中，但在执行此操作时却使用BorderLayout常量，您不应该这样做，因为这样做没有意义：

  add(play,BorderLayout.CENTER);

相反，如果使用FlowLayout，只需添加不带这些常量的组件。另外，您可能要考虑使用CardLayout并在单个JFrame中交换veiws，而不是交换JFrames。例如：

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

public class FooBarBazDriver {
   private static final String INTRO = \"intro\";
   private static final String GAME = \"game\";
   private CardLayout cardlayout = new CardLayout();
   private JPanel mainPanel = new JPanel(cardlayout);
   private IntroPanel introPanel = new IntroPanel();
   private GamePanel gamePanel = new GamePanel();

   public FooBarBazDriver() {
      mainPanel.add(introPanel.getMainComponent(),INTRO);
      mainPanel.add(gamePanel.getMainComponent(),GAME);

      introPanel.addBazBtnActionListener(new ActionListener() {
         @Override
         public void actionPerformed(ActionEvent e) {
            cardlayout.show(mainPanel,GAME);
         }
      });

      gamePanel.addBackBtnActionListener(new ActionListener() {
         @Override
         public void actionPerformed(ActionEvent e) {
            cardlayout.show(mainPanel,INTRO);
         }
      });
   }

   private JComponent getMainComponent() {
      return mainPanel;
   }

   private static void createAndShowUI() {
      JFrame frame = new JFrame(\"Foo Bar Baz\");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.getContentPane().add(new FooBarBazDriver().getMainComponent());
      frame.pack();
      frame.setLocationRelativeTo(null);
      frame.setVisible(true);
   }

   public static void main(String[] args) {
      java.awt.EventQueue.invokeLater(new Runnable() {
         public void run() {
            createAndShowUI();
         }
      });
   }
}

class IntroPanel {
   private JPanel mainPanel = new JPanel();
   private JButton baz = new JButton(\"Baz\");
   private JButton exit = new JButton(\"Exit\");

   public IntroPanel() {
      mainPanel.setLayout(new FlowLayout());
      baz = new JButton(\"Start\");
      exit = new JButton(\"exit\");

      mainPanel.add(new JLabel(\"Hello World\"));
      mainPanel.add(baz);
      mainPanel.add(exit);

      exit.addActionListener(new ActionListener() {
         @Override
         public void actionPerformed(ActionEvent e) {
            Window win = SwingUtilities.getWindowAncestor(mainPanel);
            win.dispose();
         }
      });
   }

   public void addBazBtnActionListener(ActionListener listener) {
      baz.addActionListener(listener);
   }

   public JComponent getMainComponent() {
      return mainPanel;
   }

}

class GamePanel {
   private static final Dimension MAIN_SIZE = new Dimension(400,200);
   private JPanel mainPanel = new JPanel();

   private JButton foo;
   private JButton bar;
   private JButton back;

   public GamePanel() {
      foo = new JButton(\"Foo\");
      bar = new JButton(\"Bar\");
      back = new JButton(\"return to main menu\");

      mainPanel.add(foo);
      mainPanel.add(bar);
      mainPanel.add(back);
      mainPanel.setPreferredSize(MAIN_SIZE);
   }

   public JComponent getMainComponent() {
      return mainPanel;
   }

   public void addBackBtnActionListener(ActionListener listener) {
      back.addActionListener(listener);
   }

}

,因为我必须自己测试它是否真的那么容易实现，所以我建立了这个简单的示例。它展示了您的问题的解决方案。 @jzd的答案略有启发（为此+1）。

import java.awt.Color;
import java.awt.HeadlessException;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;

public class FocusChangeTwoFrames
{
    public static void main(String[] args)
    {
        SwingUtilities.invokeLater(new Runnable() 
        {
            @Override
            public void run()
            {   
                createGUI();
            }
        });
    }

    private static void createGUI() throws HeadlessException
    {
        final JFrame f2 = new JFrame();
        f2.getContentPane().setBackground(Color.GREEN);     
        final JFrame f1 = new JFrame();     
        f1.getContentPane().setBackground(Color.RED);
        f1.setSize(400,300);
        f1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f1.setVisible(true);
        MouseListener ml = new MouseAdapter()
        {
            @Override
            public void mousePressed(MouseEvent e)
            {
                if(f1.hasFocus())
                    f2.requestFocus();
                else
                    f1.requestFocus();
            }
        };
        f1.addMouseListener(ml);
        f2.setSize(400,300);
        f2.setLocation(200,150);
        f2.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f2.setVisible(true);
        f2.addMouseListener(ml);
    }
}

享受，博罗。

如何解决GUI多帧切换

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