Swing实现动态切换Jpanel

在swing编程中我们经常需要对某个容器中的某一位置的JPanel进行动态的切换，下面代码给出了一个动态切换的例子：（ChangePanelExample.java，用VisualEditor编写，关键代码用汉语注释了）

 

 

import javax.swing.SwingUtilities;

import java.awt.BorderLayout;

import javax.swing.JPanel;

import javax.swing.JFrame;

import java.awt.Dimension;

import javax.swing.BorderFactory;

import java.awt.Color;

import javax.swing.JButton;

import java.awt.Rectangle;

import javax.swing.JLabel;

import java.awt.Font;

import javax.swing.SwingConstants;

 

public class ChangePanelExample extends JFrame {

 

private static final long serialVersionUID = 1L;

private JPanel jContentPane = null;

private JPanel jPanel = null;

private JButton jButton = null;

private JButton jButton1 = null;

private JButton jButton2 = null;

private JPanel jPanel1 = null;

private JLabel jLabel = null;

private JPanel jPanel2 = null;

private JLabel jLabel1 = null;

private JPanel jPanel3 = null;

private JLabel jLabel2 = null;

 

/**

* This method initializes jPanel

* 

* @return javax.swing.JPanel

*/

private JPanel getJPanel() {

if (jPanel == null) {

jPanel = new JPanel();

jPanel.setLayout(null);

jPanel.setPreferredSize(new Dimension(0, 60));

jPanel.setBorder(BorderFactory.createLineBorder(Color.black, 1));

jPanel.add(getJButton(), null);

jPanel.add(getJButton1(), null);

jPanel.add(getJButton2(), null);

}

return jPanel;

}

 

/**

* This method initializes jButton

* 

* @return javax.swing.JButton

*/

private JButton getJButton() {

if (jButton == null) {

jButton = new JButton();

jButton.setBounds(new Rectangle(54, 11, 83, 27));

jButton.setForeground(Color.red);

jButton.setText("Panel一");

jButton.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

jContentPane.remove(((BorderLayout) jContentPane

.getLayout())

.getLayoutComponent(BorderLayout.CENTER));//删除内容面板中间原来的组建

jContentPane.add(getJPanel1(), BorderLayout.CENTER);//添加要切换的面板

jContentPane.validate();//重构内容面板

jContentPane.repaint();//重绘内容面板

//上面两句缺一不可，

//没有validate()删除和添加没有效果

//没有repaint()界面绘出现混乱

}

});

}

return jButton;

}

 

/**

* This method initializes jButton1

* 

* @return javax.swing.JButton

*/

private JButton getJButton1() {

if (jButton1 == null) {

jButton1 = new JButton();

jButton1.setBounds(new Rectangle(191, 11, 83, 27));

jButton1.setForeground(Color.blue);

jButton1.setText("Panel二");

jButton1.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

jContentPane.remove(((BorderLayout) jContentPane

.getLayout())

.getLayoutComponent(BorderLayout.CENTER));

jContentPane.add(getJPanel2(), BorderLayout.CENTER);

jContentPane.validate();

jContentPane.repaint();

}

});

}

return jButton1;

}

 

/**

* This method initializes jButton2

* 

* @return javax.swing.JButton

*/

private JButton getJButton2() {

if (jButton2 == null) {

jButton2 = new JButton();

jButton2.setBounds(new Rectangle(328, 11, 83, 27));

jButton2.setForeground(Color.green);

jButton2.setText("Panel三");

jButton2.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

jContentPane.remove(((BorderLayout) jContentPane

.getLayout())

.getLayoutComponent(BorderLayout.CENTER));

jContentPane.add(getJPanel3(), BorderLayout.CENTER);

jContentPane.validate();

jContentPane.repaint();

}

});

}

return jButton2;

}

 

/**

* This method initializes jPanel1

* 

* @return javax.swing.JPanel

*/

private JPanel getJPanel1() {

if (jPanel1 == null) {

jLabel = new JLabel();

jLabel.setBounds(new Rectangle(151, 99, 163, 113));

jLabel.setFont(new Font("Dialog", Font.BOLD, 24));

jLabel.setHorizontalAlignment(SwingConstants.CENTER);

jLabel.setForeground(new Color(255, 51, 51));

jLabel.setText("Panel一");

jPanel1 = new JPanel();

jPanel1.setLayout(null);

jPanel1.add(jLabel, null);

}

return jPanel1;

}

 

/**

* This method initializes jPanel2

* 

* @return javax.swing.JPanel

*/

private JPanel getJPanel2() {

if (jPanel2 == null) {

jLabel1 = new JLabel();

jLabel1.setBounds(new Rectangle(162, 100, 138, 96));

jLabel1.setFont(new Font("Dialog", Font.BOLD, 24));

jLabel1.setHorizontalAlignment(SwingConstants.CENTER);

jLabel1.setForeground(Color.blue);

jLabel1.setText("Panel二");

jPanel2 = new JPanel();

jPanel2.setLayout(null);

jPanel2.add(jLabel1, null);

}

return jPanel2;

}

 

/**

* This method initializes jPanel3

* 

* @return javax.swing.JPanel

*/

private JPanel getJPanel3() {

if (jPanel3 == null) {

jLabel2 = new JLabel();

jLabel2.setBounds(new Rectangle(149, 87, 172, 134));

jLabel2.setFont(new Font("Dialog", Font.BOLD, 24));

jLabel2.setHorizontalAlignment(SwingConstants.CENTER);

jLabel2.setForeground(Color.green);

jLabel2.setText("Panel三");

jPanel3 = new JPanel();

jPanel3.setLayout(null);

jPanel3.add(jLabel2, null);

}

return jPanel3;

}

 

/**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

SwingUtilities.invokeLater(new Runnable() {

public void run() {

ChangePanelExample thisClass = new ChangePanelExample();

thisClass.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

thisClass.setVisible(true);

}

});

}

 

/**

* This is the default constructor

*/

public ChangePanelExample() {

super();

initialize();

}

 

/**

* This method initializes this

* 

* @return void

*/

private void initialize() {

this.setSize(472, 410);

this.setResizable(false);

this.setContentPane(getJContentPane());

this.setTitle("JPanel切换示例");

}

 

/**

* This method initializes jContentPane

* 

* @return javax.swing.JPanel

*/

private JPanel getJContentPane() {

if (jContentPane == null) {

jContentPane = new JPanel();

jContentPane.setLayout(new BorderLayout());

jContentPane.add(getJPanel(), BorderLayout.NORTH);

jContentPane.add(getJPanel1(), BorderLayout.CENTER);

}

return jContentPane;

}

 

} // @jve:decl-index=0:visual-constraint="92,55"