本文介绍了JFrame中的开关面板的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有2个JPanels和1个JFrame，当我单击一个按钮时，我试图在面板之间切换.我不想使用CardLayout，因为我想要不同的面板，并且使用CardLayouts我可以为两个按钮使用相同的按钮.我的代码是:
I have 2 JPanels and 1 JFrame, and I'm trying to switch between panels when I click a button..I don't want to use CardLayout, because I want different panels and with CardLayouts I just can have the same button for both.My code is:
package javaapplication2;
import javax.swing.JPanel;
public class NewJFrame extends javax.swing.JFrame {
/**
* Creates new form NewJFrame
*/JPanel panel1 = new JPanel();
JPanel panel2 = new JPanel();
public NewJFrame() {
initComponents();
}
private void initComponents() {
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setBackground(new java.awt.Color(121, 183, 60));
setSize(200, 300);
setResizable(false);
/**panel1**/
jButton1 = new javax.swing.JButton();
jButton1.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
jButton1MouseClicked(evt);
}
});
jButton1.setText("jButton1");
panel1.setBackground(new java.awt.Color(121, 183, 60));
panel1.setMaximumSize(new java.awt.Dimension(100, 200));
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(panel1);
panel1.setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(164, 164, 164)
.addComponent(jButton1)
.addContainerGap(172, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(115, 115, 115)
.addComponent(jButton1)
.addContainerGap(158, Short.MAX_VALUE))
);
/**panel2**/
jButton2 = new javax.swing.JButton();
jButton2.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
jButton2MouseClicked(evt);
}
});
jButton2.setText("jButton2");
panel2.setBackground(new java.awt.Color(101, 13, 61));
panel2.setMaximumSize(new java.awt.Dimension(100, 200));
javax.swing.GroupLayout layout2 = new javax.swing.GroupLayout(panel2);
panel2.setLayout(layout2);
layout2.setHorizontalGroup(
layout2.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout2.createSequentialGroup()
.addGap(164, 164, 164)
.addComponent(jButton2)
.addContainerGap(172, Short.MAX_VALUE))
);
layout2.setVerticalGroup(
layout2.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout2.createSequentialGroup()
.addGap(115, 115, 115)
.addComponent(jButton2)
.addContainerGap(158, Short.MAX_VALUE))
);
add(panel2);
pack();
}
public void changePanel(){
getContentPane().removeAll();
add(panel1);
invalidate();
repaint();
}
private void jButton1MouseClicked(java.awt.event.MouseEvent evt) {
changePanel();
}
private void jButton2MouseClicked(java.awt.event.MouseEvent evt) {
changePanel();
}
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
}
推荐答案
下面是一个帮助您的小例子:
Here is one small example for your help :
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class CardLayoutExample
{
private JPanel contentPane;
private MyPanel panel1;
private MyPanel2 panel2;
private void displayGUI()
{
JFrame frame = new JFrame("Card Layout Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel contentPane = new JPanel();
contentPane.setBorder(
BorderFactory.createEmptyBorder(5, 5, 5, 5));
contentPane.setLayout(new CardLayout());
panel1 = new MyPanel(contentPane);
panel2 = new MyPanel2(contentPane);
contentPane.add(panel1, "Panel 1");
contentPane.add(panel2, "Panel 2");
frame.setContentPane(contentPane);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String... args)
{
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
new CardLayoutExample().displayGUI();
}
});
}
}
class MyPanel extends JPanel
{
private JButton jcomp4;
private JPanel contentPane;
public MyPanel(JPanel panel)
{
contentPane = panel;
setOpaque(true);
setBackground(Color.RED.darker().darker());
//construct components
jcomp4 = new JButton ("openNewWindow");
jcomp4.addActionListener( new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
CardLayout cardLayout = (CardLayout) contentPane.getLayout();
cardLayout.next(contentPane);
}
});
add(jcomp4);
}
@Override
public Dimension getPreferredSize()
{
return (new Dimension(500, 500));
}
}
class MyPanel2 extends JPanel
{
private JButton jcomp1;
private JPanel contentPane;
public MyPanel2(JPanel panel)
{
contentPane = panel;
setOpaque(true);
setBackground(Color.GREEN.darker().darker());
//construct components
jcomp1 = new JButton ("Back");
jcomp1.addActionListener( new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
CardLayout cardLayout = (CardLayout) contentPane.getLayout();
cardLayout.next(contentPane);
}
});
add(jcomp1);
}
@Override
public Dimension getPreferredSize()
{
return (new Dimension(500, 500));
}
}
最新编辑
显示您选择的 JPanel
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class CardLayoutExample
{
private JPanel contentPane;
private MyPanel panel1;
private MyPanel2 panel2;
private MyPanel2 panel3;
private JComboBox choiceBox;
private String[] choices = {
"Panel 1",
"Panel 2",
"Panel 3"
};
private void displayGUI()
{
JFrame frame = new JFrame("Card Layout Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel contentPane = new JPanel();
contentPane.setBorder(
BorderFactory.createEmptyBorder(5, 5, 5, 5));
contentPane.setLayout(new CardLayout());
choiceBox = new JComboBox(choices);
panel1 = new MyPanel(contentPane, this);
panel2 = new MyPanel2(contentPane
, Color.GREEN.darker().darker(), this);
panel3 = new MyPanel2(contentPane
, Color.DARK_GRAY, this);
contentPane.add(panel1, "Panel 1");
contentPane.add(panel2, "Panel 2");
contentPane.add(panel3, "Panel 3");
frame.getContentPane().add(choiceBox, BorderLayout.PAGE_START);
frame.getContentPane().add(contentPane, BorderLayout.CENTER);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public JComboBox getChoiceBox()
{
return choiceBox;
}
public static void main(String... args)
{
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
new CardLayoutExample().displayGUI();
}
});
}
}
class MyPanel extends JPanel
{
private JButton jcomp4;
private JPanel contentPane;
private JComboBox choiceBox;
public MyPanel(JPanel panel, CardLayoutExample cle)
{
choiceBox = cle.getChoiceBox();
contentPane = panel;
setOpaque(true);
setBackground(Color.RED.darker().darker());
//construct components
jcomp4 = new JButton ("Show New Panel");
jcomp4.addActionListener( new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String changeToPanel = (String) choiceBox.getSelectedItem();
CardLayout cardLayout = (CardLayout) contentPane.getLayout();
cardLayout.show(contentPane, changeToPanel);
}
});
add(jcomp4);
}
@Override
public Dimension getPreferredSize()
{
return (new Dimension(500, 500));
}
}
class MyPanel2 extends JPanel
{
private JButton jcomp1;
private JPanel contentPane;
private Color backgroundColour;
private JComboBox choiceBox;
public MyPanel2(JPanel panel, Color c, CardLayoutExample cle)
{
contentPane = panel;
backgroundColour = c;
choiceBox = cle.getChoiceBox();
setOpaque(true);
setBackground(backgroundColour);
//construct components
jcomp1 = new JButton ("Show New Panel");
jcomp1.addActionListener( new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String changeToPanel = (String) choiceBox.getSelectedItem();
CardLayout cardLayout = (CardLayout) contentPane.getLayout();
cardLayout.show(contentPane, changeToPanel);
}
});
add(jcomp1);
}
@Override
public Dimension getPreferredSize()
{
return (new Dimension(500, 500));
}
}
这篇关于JFrame中的开关面板的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！