JPanel 为什么无法显示呢？

Question

请各位大哥帮看下下面的代码，我想remove掉原来的一个jpanel，然后在在它的位置上显示另一个jpanel，不知道这段代码为什么无法实现呢？帮帮忙，谢谢import java.awt.*;
import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;public class Frame1
    extends JFrame {
  JPanel contentPane;
  BorderLayout borderLayout1 = new BorderLayout();
  JPanel jPanel1 = new JPanel();
  JPanel jPanel2 = new JPanel();
  JButton jButton1 = new JButton();
  JTextField jTextField1 = new JTextField();  public Frame1() {
    try {
      setDefaultCloseOperation(EXIT_ON_CLOSE);
      jbInit();
    }
    catch (Exception exception) {
      exception.printStackTrace();
    }
  }  /**
   * Component initialization.
   *
   * @throws java.lang.Exception
   */
  private void jbInit() throws Exception {
    contentPane = (JPanel) getContentPane();
    contentPane.setLayout(borderLayout1);
    setSize(new Dimension(400, 300));
    setTitle("Frame Title");
    jPanel1.setBorder(BorderFactory.createEtchedBorder());
    jPanel2.setBorder(BorderFactory.createEtchedBorder());
    jButton1.setText("测试");
    jButton1.addActionListener(new Frame1_jButton1_actionAdapter(this));
    jTextField1.setText("jTextField1");
    contentPane.add(jPanel1, java.awt.BorderLayout.NORTH);
    jPanel1.add(jButton1);
    contentPane.add(jPanel2, java.awt.BorderLayout.WEST);
    jPanel2.add(jTextField1);
  }  public void jButton1_actionPerformed(ActionEvent e) {
     panel p=new panel();
     contentPane.remove(jPanel2);
     contentPane.add(p, java.awt.BorderLayout.WEST);
     this.show();
  }
}class Frame1_jButton1_actionAdapter
    implements ActionListener {
  private Frame1 adaptee;
  Frame1_jButton1_actionAdapter(Frame1 adaptee) {
    this.adaptee = adaptee;
  }  public void actionPerformed(ActionEvent e) {
    adaptee.jButton1_actionPerformed(e);
  }
}

Answer 1

下面规范了一下，麻烦再给看下
=================================
import  java.awt.*;  
import  javax.swing.*;  
import  java.awt.event.ActionEvent;  
import  java.awt.event.ActionListener;  public  class  TESTFrame  
       extends  JFrame  {  
   JPanel  contentPane;  
   BorderLayout  borderLayout1  =  new  BorderLayout();  
   JPanel  NORTHPanel  =  new  JPanel();  
   JPanel WESTPanel =  new  JPanel();  
   JButton cmdTest =  new  JButton();  
   JTextField tempTextField =  new  JTextField();     public  TESTFrame()  {  
       try  {  
           setDefaultCloseOperation(EXIT_ON_CLOSE);  
           jbInit();  
       }  
       catch  (Exception  exception)  {  
           exception.printStackTrace();  
       }  
   }     /**  
     *  Component  initialization.  
     *  
     *  @throws  java.lang.Exception  
     */  
   private  void  jbInit()  throws  Exception  {  
       contentPane  =  (JPanel)  getContentPane();  
       contentPane.setLayout(borderLayout1);  
       setSize(new  Dimension(400,  300));  
       setTitle("Frame  Title");  
       NORTHPanel.setBorder(BorderFactory.createEtchedBorder());
    WESTPanel.setBorder(BorderFactory.createEtchedBorder());
    cmdTest.setText("测试");
    cmdTest.addActionListener(new  Frame1_jButton1_actionAdapter(this));
    tempTextField.setText("");  
       contentPane.add(NORTHPanel,  java.awt.BorderLayout.NORTH);  
       NORTHPanel.add(cmdTest);  
       contentPane.add(WESTPanel,  java.awt.BorderLayout.WEST);
    WESTPanel.add(tempTextField);  
   }     public  void  cmdTest_actionPerformed(ActionEvent  e)  {  
         panel  p=new  panel();        //新建一个panel对象
         contentPane.remove(WESTPanel);  //移除westpanel
         contentPane.add(p,  java.awt.BorderLayout.WEST); //加入新建的panel 
         this.show();  
   }  
}  class  TESTFrame_cmdTest_actionAdapter  
       implements  ActionListener  {  
   private  TESTFrame  adaptee;  
   TESTFrame_cmdTest_actionAdapter(TESTFrame  adaptee)  {  
       this.adaptee  =  adaptee;  
   }     public  void  actionPerformed(ActionEvent  e)  {  
       adaptee.cmdTest_actionPerformed(e);  
   }  
}

Answer 2

panel  p=new  panel();        
panel什么东西
不是JPanel?

Answer 3

我放在IDE里面 全是红点..貌似很多错误~~还是代码没贴全?

Answer 4

改了一下，lz的书比较老， 还在用show（）， lz查一下api就明白了。
在新的panel里加了一个label作标示。main， 在这里调用frame：
---------------------------------------
public class Main {
    
    public static void main(String[] args) {
        TESTFrame t = new TESTFrame();
        t.setVisible(true);
    }
}修改lz的TESTFrame：
-----------------------------------------------------
import java.awt.*;
import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;public class TESTFrame extends JFrame {
    JPanel contentPane;
    BorderLayout borderLayout1 = new BorderLayout();
    JPanel NORTHPanel = new JPanel();
    JPanel WESTPanel = new JPanel();
    JButton cmdTest = new JButton();
    JTextField tempTextField = new JTextField();
    
    public TESTFrame() {
        try {
            setDefaultCloseOperation(EXIT_ON_CLOSE);
            jbInit();
        } catch (Exception exception) {
            exception.printStackTrace();
        }
    }
    
    /**
     * Component initialization.
     *
     * @throws java.lang.Exception
     */
    private void jbInit() throws Exception {
        contentPane = (JPanel) getContentPane();
        contentPane.setLayout(borderLayout1);
        setSize(new Dimension(400, 300));
        setTitle("Frame Title");
        NORTHPanel.setBorder(BorderFactory.createEtchedBorder());
        WESTPanel.setBorder(BorderFactory.createEtchedBorder());
        
        cmdTest.setText("测试");//空些行， 代码看得清楚些
        cmdTest.addActionListener(new TESTFrame_cmdTest_actionAdapter());
        
        contentPane.add(NORTHPanel, java.awt.BorderLayout.NORTH);
        NORTHPanel.add(cmdTest);
        
        contentPane.add(WESTPanel, java.awt.BorderLayout.WEST);
        tempTextField.setText("eeeeeeee");
        WESTPanel.add(tempTextField);
    }
    class TESTFrame_cmdTest_actionAdapter implements ActionListener {
        public void actionPerformed(ActionEvent e) {
     
            JPanel p=new JPanel(); //新建一个panel对象
            JLabel label = new JLabel("new west");
            p.add(label);
            contentPane.remove(WESTPanel); //移除westpanel           
            contentPane.add(p, java.awt.BorderLayout.WEST); //加入新建的panel
            refresh();
        }     
        
    }
    private void refresh(){
        this.validate();
    }
    
    
}