动态JFrame - 更改JFrame内容

Question

我最近开发的软件应用程序主要是非常基本的，而且我遇到了问题。

我正在开发的应用程序有许多不同的菜单和屏幕，我希望JFrame能够在单击按钮时显示。

由于这是大多数应用程序似乎要实现的功能，所以我可以看到令人惊讶的很少的信息，这让我想知道我的方法是否完全关闭，但是是说明这种方法的一些示例代码。

因此，我的问题是，a）什么是实现这个目标的最佳方式，以及b）我现在的代码有什么问题？但前一个问题是最重要的。

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

import javax.swing.BoxLayout; 
import javax.swing.JButton; 
import javax.swing.JFrame; 
import javax.swing.JLabel; 
import javax.swing.JPanel; 
import javax.swing.SwingUtilities; 

public class Demo { 
    JFrame frame; 
    JButton nextButton = new JButton ("Next Screen"); 

    public void setup() { 
     frame = new JFrame(); 
     frame.setVisible(true); 
     frame.add(new PanelOne()); 
     frame.pack(); 
    } 


    public class PanelOne extends JPanel { { 
     this.setLayout(new BoxLayout(this, BoxLayout.Y_AXIS)); 
     this.add(new JLabel("Label One")); 
     this.add(new JLabel("Label Two")); 
     this.add(new JLabel("Label Three")); 
     this.add(new JLabel("Label Four")); 
     this.add(new JLabel("Label Five")); 
     JButton button = new JButton("Next Screen"); 
     button.addActionListener(new ActionListener() { 

      @Override 
      public void actionPerformed(ActionEvent e) { 
       swapPanel(); 
      } 
     }); 
     this.add(button); 
    } } 
    public class PanelTwo extends JPanel {{ 
     this.setLayout(new BoxLayout(this, BoxLayout.Y_AXIS)); 
     this.add(new JButton("Button One")); 
     this.add(new JButton("Button Two")); 
     this.add(new JButton("Button Three")); 
     this.add(new JButton("Button Four")); 
     this.add(new JButton("Button Five")); 
    }} 


    protected void swapPanel() { 
     SwingUtilities.invokeLater(new Runnable() { 

      @Override 
      public void run() { 

       frame.removeAll(); 
       frame.add(new PanelTwo()); 
       frame.invalidate(); 
       frame.revalidate(); 

      } 

     }); 

    } 

    public static void main (String[] args) { 
     Demo demo = new Demo(); 
     demo.setup(); 
    } 
} 

Answer 1

以此作为你的代码.....

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

import javax.swing.BoxLayout; 
import javax.swing.JButton; 
import javax.swing.JFrame; 
import javax.swing.JLabel; 
import javax.swing.JPanel; 
import javax.swing.SwingUtilities; 

public class Demo { 
    JFrame frame; 
    JButton nextButton = new JButton ("Next Screen"); 
    PanelOne p = new PanelOne(); 
    public void setup() { 
     frame = new JFrame(); 
     frame.setVisible(true); 

     frame.add(p); 
     frame.pack(); 
    } 


    public class PanelOne extends JPanel { { 
     this.setLayout(new BoxLayout(this, BoxLayout.Y_AXIS)); 
     this.add(new JLabel("Label One")); 
     this.add(new JLabel("Label Two")); 
     this.add(new JLabel("Label Three")); 
     this.add(new JLabel("Label Four")); 
     this.add(new JLabel("Label Five")); 
     JButton button = new JButton("Next Screen"); 
     button.addActionListener(new ActionListener() { 

      @Override 
      public void actionPerformed(ActionEvent e) { 
       swapPanel(); 
      } 
     }); 
     this.add(button); 
    } } 
    public class PanelTwo extends JPanel {{ 
     this.setLayout(new BoxLayout(this, BoxLayout.Y_AXIS)); 
     this.add(new JButton("Button One")); 
     this.add(new JButton("Button Two")); 
     this.add(new JButton("Button Three")); 
     this.add(new JButton("Button Four")); 
     this.add(new JButton("Button Five")); 
    }} 


    protected void swapPanel() { 
     SwingUtilities.invokeLater(new Runnable() { 

      @Override 
      public void run() { 


       frame.remove(p); 
       frame.add(new PanelTwo()); 
       frame.invalidate(); 
       frame.revalidate(); 

      } 

     }); 

    } 

    public static void main (String[] args) { 
     Demo demo = new Demo(); 
     demo.setup(); 
    } 
} 

希望它能帮助....