嗯，我似乎遇到了一个奇怪的问题，我相信我曾经解决过，但我想不起来了。我有一个 JFrame，其中有一个 JPanel，我试图将另一个 JPanel 添加到现有的 JPanel。但是，没有任何显示。我已经设置了调用 setVisible() 和 repaint()，但仍然不行。
有人愿意尝试一下吗？
这是我的代码:
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package bakarangerx;
import javax.swing.*;
import java.awt.*;
/**
*
* @author Ryan
*/
public class MainForm extends javax.swing.JFrame {
/**
* Creates new form MainForm
*/
public MainForm() {
initComponents();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
FileChooser_Open = new javax.swing.JFileChooser();
FileChooser_Save = new javax.swing.JFileChooser();
Panel_Main = new javax.swing.JPanel();
jMenuBar1 = new javax.swing.JMenuBar();
jMenu1 = new javax.swing.JMenu();
MenuItem_New = new javax.swing.JMenuItem();
MenuItem_Open = new javax.swing.JMenuItem();
MenuItem_Save = new javax.swing.JMenuItem();
jMenu2 = new javax.swing.JMenu();
FileChooser_Open.setDialogTitle("Open BakaRangerX File...");
FileChooser_Open.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
FileChooser_OpenMouseClicked(evt);
}
});
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
Panel_Main.setLayout(new java.awt.GridLayout());
jMenu1.setText("File");
MenuItem_New.setText("New");
MenuItem_New.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
MenuItem_NewMouseClicked(evt);
}
});
jMenu1.add(MenuItem_New);
MenuItem_Open.setText("Open");
MenuItem_Open.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
MenuItem_OpenMouseClicked(evt);
}
});
MenuItem_Open.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
MenuItem_OpenActionPerformed(evt);
}
});
jMenu1.add(MenuItem_Open);
MenuItem_Save.setText("Save");
MenuItem_Save.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
MenuItem_SaveMouseClicked(evt);
}
});
jMenu1.add(MenuItem_Save);
jMenuBar1.add(jMenu1);
jMenu2.setText("Edit");
jMenuBar1.add(jMenu2);
setJMenuBar(jMenuBar1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(Panel_Main, javax.swing.GroupLayout.DEFAULT_SIZE, 788, Short.MAX_VALUE)
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(Panel_Main, javax.swing.GroupLayout.DEFAULT_SIZE, 459, Short.MAX_VALUE)
.addContainerGap())
);
pack();
}// </editor-fold>
private void MenuItem_OpenActionPerformed(java.awt.event.ActionEvent evt) {
//FileChooser_Open.showOpenDialog(this);
ExaminerPanel newPanel = new ExaminerPanel();
newPanel.setMinimumSize(new Dimension(200, 200));
newPanel.setVisible(true);
Panel_Main.setVisible(true);
Panel_Main.add(newPanel);
newPanel.repaint();
Panel_Main.repaint();
this.repaint();
}
private void MenuItem_NewMouseClicked(java.awt.event.MouseEvent evt) {
// TODO add your handling code here:
}
private void MenuItem_SaveMouseClicked(java.awt.event.MouseEvent evt) {
// TODO add your handling code here:
}
private void MenuItem_OpenMouseClicked(java.awt.event.MouseEvent evt) {
// TODO add your handling code here:
}
private void FileChooser_OpenMouseClicked(java.awt.event.MouseEvent evt) {
if(!FileChooser_Open.getSelectedFile().equals(null))
{
}
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(MainForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(MainForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(MainForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(MainForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new MainForm().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JFileChooser FileChooser_Open;
private javax.swing.JFileChooser FileChooser_Save;
private javax.swing.JMenuItem MenuItem_New;
private javax.swing.JMenuItem MenuItem_Open;
private javax.swing.JMenuItem MenuItem_Save;
private javax.swing.JPanel Panel_Main;
private javax.swing.JMenu jMenu1;
private javax.swing.JMenu jMenu2;
private javax.swing.JMenuBar jMenuBar1;
// End of variables declaration
}
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package bakarangerx;
/**
*
* @author Ryan
*/
public class ExaminerPanel extends javax.swing.JPanel {
/**
* Creates new form Examiner
*/
public ExaminerPanel() {
initComponents();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
Button_Previous = new javax.swing.JButton();
Button_Next = new javax.swing.JButton();
Button_Check = new javax.swing.JButton();
jLabel3 = new javax.swing.JLabel();
jLabel4 = new javax.swing.JLabel();
jScrollPane1 = new javax.swing.JScrollPane();
TextArea_CorrectAnswer = new javax.swing.JTextArea();
jScrollPane2 = new javax.swing.JScrollPane();
TextArea_Question = new javax.swing.JTextArea();
jLabel5 = new javax.swing.JLabel();
jScrollPane3 = new javax.swing.JScrollPane();
TextArea_Answer = new javax.swing.JTextArea();
jLabel6 = new javax.swing.JLabel();
jLabel7 = new javax.swing.JLabel();
jLabel8 = new javax.swing.JLabel();
jLabel9 = new javax.swing.JLabel();
jLabel10 = new javax.swing.JLabel();
jLabel11 = new javax.swing.JLabel();
jLabel12 = new javax.swing.JLabel();
jLabel13 = new javax.swing.JLabel();
jLabel14 = new javax.swing.JLabel();
jLabel15 = new javax.swing.JLabel();
jLabel1.setText("Question");
jLabel2.setText("Correct Answer");
Button_Previous.setText("Previous");
Button_Next.setText("Next");
Button_Check.setText("Check");
jLabel3.setText("Wrong");
jLabel4.setText("Right");
TextArea_CorrectAnswer.setColumns(20);
TextArea_CorrectAnswer.setRows(5);
jScrollPane1.setViewportView(TextArea_CorrectAnswer);
TextArea_Question.setColumns(20);
TextArea_Question.setRows(5);
jScrollPane2.setViewportView(TextArea_Question);
jLabel5.setText("Answer");
TextArea_Answer.setColumns(20);
TextArea_Answer.setRows(5);
jScrollPane3.setViewportView(TextArea_Answer);
jLabel6.setText("Total Time");
jLabel7.setText("Time");
jLabel8.setText("jLabel8");
jLabel9.setText("jLabel9");
jLabel10.setText("jLabel10");
jLabel11.setText("jLabel11");
jLabel12.setText("jLabel12");
jLabel13.setText("Grade");
jLabel14.setText("jLabel14");
jLabel15.setText("%");
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
this.setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel2)
.addComponent(jLabel1))
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jScrollPane2)
.addComponent(jScrollPane1)))
.addGroup(layout.createSequentialGroup()
.addGap(0, 0, Short.MAX_VALUE)
.addComponent(jLabel13)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jLabel12)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jLabel3)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jLabel9)
.addGap(18, 18, 18)
.addComponent(jLabel4)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jLabel11)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jLabel7)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jLabel10))
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
.addComponent(jLabel5)
.addGap(57, 57, 57)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(Button_Previous)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(Button_Next))
.addComponent(jScrollPane3)))
.addGroup(layout.createSequentialGroup()
.addGap(0, 0, Short.MAX_VALUE)
.addComponent(Button_Check)))
.addGap(19, 19, 19))
.addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
.addComponent(jLabel6)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jLabel8)
.addGap(76, 76, 76)))
.addContainerGap())
.addGroup(layout.createSequentialGroup()
.addGap(318, 318, 318)
.addComponent(jLabel15)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jLabel14)
.addContainerGap(430, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel6)
.addComponent(jLabel8))
.addGap(16, 16, 16)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel14)
.addComponent(jLabel15))
.addGap(17, 17, 17)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel3)
.addComponent(jLabel4)
.addComponent(jLabel7)
.addComponent(jLabel9)
.addComponent(jLabel10)
.addComponent(jLabel11)
.addComponent(jLabel12)
.addComponent(jLabel13))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel2)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(22, 22, 22)
.addComponent(Button_Check)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel5)
.addComponent(jScrollPane3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(Button_Next)
.addComponent(Button_Previous)))
.addComponent(jLabel1))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
}// </editor-fold>
// Variables declaration - do not modify
private javax.swing.JButton Button_Check;
private javax.swing.JButton Button_Next;
private javax.swing.JButton Button_Previous;
private javax.swing.JTextArea TextArea_Answer;
private javax.swing.JTextArea TextArea_CorrectAnswer;
private javax.swing.JTextArea TextArea_Question;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel10;
private javax.swing.JLabel jLabel11;
private javax.swing.JLabel jLabel12;
private javax.swing.JLabel jLabel13;
private javax.swing.JLabel jLabel14;
private javax.swing.JLabel jLabel15;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JLabel jLabel4;
private javax.swing.JLabel jLabel5;
private javax.swing.JLabel jLabel6;
private javax.swing.JLabel jLabel7;
private javax.swing.JLabel jLabel8;
private javax.swing.JLabel jLabel9;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JScrollPane jScrollPane3;
// End of variables declaration
}
最佳答案
使用 CardLayout 将多个 JPanel 对象添加到您的框架中。使用 CardLayout，您可以随时显示一个面板。
这是 CardLayout 的简单演示:https://stackoverflow.com/a/9377623/544983
关于java - JFrame 和 JPanel，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/12963007/