问题
I'm trying to develop a simple project. I need to change the contents of the panel defined inside a JInternalFrame. The code is as follows:
JFrame_main:
public class JFrame_main extends javax.swing.JFrame
{
/**
* Creates new form JFrame_main
*/
public JFrame_main()
{
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()
{
basepanel = new javax.swing.JPanel();
lbl_name = new javax.swing.JLabel();
bt_clear = new javax.swing.JButton();
lbl_title = new javax.swing.JLabel();
txt_name = new javax.swing.JTextField();
txt_cardno = new javax.swing.JTextField();
lbl_cardno = new javax.swing.JLabel();
lbl_accesscode = new javax.swing.JLabel();
txt_accesscode = new javax.swing.JPasswordField();
bt_ok = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setPreferredSize(new java.awt.Dimension(839, 480));
basepanel.setPreferredSize(new java.awt.Dimension(839, 480));
lbl_name.setFont(new java.awt.Font("Tahoma", 0, 20)); // NOI18N
lbl_name.setText("NAME");
bt_clear.setFont(new java.awt.Font("Tahoma", 0, 18)); // NOI18N
bt_clear.setText("CLEAR");
bt_clear.addActionListener(new java.awt.event.ActionListener()
{
public void actionPerformed(java.awt.event.ActionEvent evt)
{
bt_clearActionPerformed(evt);
}
});
lbl_title.setFont(new java.awt.Font("Times New Roman", 1, 30)); // NOI18N
lbl_title.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
lbl_title.setText("AUTOMATED GOVERNMENT RATION SHOP");
txt_name.setFont(new java.awt.Font("Tahoma", 0, 18)); // NOI18N
txt_cardno.setFont(new java.awt.Font("Tahoma", 0, 18)); // NOI18N
lbl_cardno.setFont(new java.awt.Font("Tahoma", 0, 20)); // NOI18N
lbl_cardno.setText("CARD NO.");
lbl_accesscode.setFont(new java.awt.Font("Tahoma", 0, 20)); // NOI18N
lbl_accesscode.setText("ACCESS CODE");
txt_accesscode.setFont(new java.awt.Font("Tahoma", 0, 18)); // NOI18N
txt_accesscode.setMinimumSize(new java.awt.Dimension(6, 26));
bt_ok.setFont(new java.awt.Font("Tahoma", 0, 18)); // NOI18N
bt_ok.setText("OK");
bt_ok.addActionListener(new java.awt.event.ActionListener()
{
public void actionPerformed(java.awt.event.ActionEvent evt)
{
bt_okActionPerformed(evt);
}
});
javax.swing.GroupLayout basepanelLayout = new javax.swing.GroupLayout(basepanel);
basepanel.setLayout(basepanelLayout);
basepanelLayout.setHorizontalGroup(
basepanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(basepanelLayout.createSequentialGroup()
.addGroup(basepanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(basepanelLayout.createSequentialGroup()
.addGap(96, 96, 96)
.addComponent(lbl_title))
.addGroup(basepanelLayout.createSequentialGroup()
.addGap(226, 226, 226)
.addGroup(basepanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addGroup(javax.swing.GroupLayout.Alignment.LEADING, basepanelLayout.createSequentialGroup()
.addGap(15, 15, 15)
.addComponent(bt_ok, javax.swing.GroupLayout.PREFERRED_SIZE, 120, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(79, 79, 79)
.addComponent(bt_clear, javax.swing.GroupLayout.PREFERRED_SIZE, 120, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(basepanelLayout.createSequentialGroup()
.addComponent(lbl_name)
.addGap(101, 101, 101)
.addComponent(txt_name, javax.swing.GroupLayout.PREFERRED_SIZE, 208, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(basepanelLayout.createSequentialGroup()
.addGroup(basepanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(lbl_cardno)
.addComponent(lbl_accesscode))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGroup(basepanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(txt_accesscode, javax.swing.GroupLayout.PREFERRED_SIZE, 208, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(txt_cardno, javax.swing.GroupLayout.PREFERRED_SIZE, 208, javax.swing.GroupLayout.PREFERRED_SIZE))))))
.addContainerGap(99, Short.MAX_VALUE))
);
basepanelLayout.setVerticalGroup(
basepanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(basepanelLayout.createSequentialGroup()
.addGap(77, 77, 77)
.addComponent(lbl_title)
.addGap(61, 61, 61)
.addGroup(basepanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(basepanelLayout.createSequentialGroup()
.addGap(2, 2, 2)
.addComponent(lbl_name))
.addComponent(txt_name, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(basepanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(txt_cardno, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(lbl_cardno, javax.swing.GroupLayout.Alignment.TRAILING))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(basepanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(txt_accesscode, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(lbl_accesscode))
.addGap(53, 53, 53)
.addGroup(basepanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(bt_ok)
.addComponent(bt_clear))
.addGap(0, 126, Short.MAX_VALUE))
);
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(basepanel, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(basepanel, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void bt_clearActionPerformed(java.awt.event.ActionEvent evt)
{
// TODO add your handling code here:
txt_name.setText("");
txt_cardno.setText("");
txt_accesscode.setText("");
}
private void bt_okActionPerformed(java.awt.event.ActionEvent evt)
{
// TODO add your handling code here:
if (authen())
{
JPanel_menu menu = new JPanel_menu();
changepanel(menu);
}
}
/**
* @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(JFrame_main.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
catch (InstantiationException ex)
{
java.util.logging.Logger.getLogger(JFrame_main.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
catch (IllegalAccessException ex)
{
java.util.logging.Logger.getLogger(JFrame_main.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
catch (javax.swing.UnsupportedLookAndFeelException ex)
{
java.util.logging.Logger.getLogger(JFrame_main.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 JFrame_main().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JPanel basepanel;
private javax.swing.JButton bt_clear;
private javax.swing.JButton bt_ok;
private javax.swing.JLabel lbl_accesscode;
private javax.swing.JLabel lbl_cardno;
private javax.swing.JLabel lbl_name;
private javax.swing.JLabel lbl_title;
private javax.swing.JPasswordField txt_accesscode;
private javax.swing.JTextField txt_cardno;
private javax.swing.JTextField txt_name;
// End of variables declaration
//Verifying the USER
boolean authen()
{
//Add the database query for user verification
return true;
}
private void changepanel(Component objectname)
{
basepanel.removeAll();
basepanel.add(objectname);
basepanel.repaint();
basepanel.validate();
}
}
JPanel_menu: (The page i need to display after pressing OK button)
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package com.ratm.UI;
/**
*
* @author Dinesh Prasanth
*/
public class JPanel_menu extends javax.swing.JPanel
{
/**
* Creates new form JPanel_menu
*/
public JPanel_menu()
{
System.out.print("ENTERED");
initComponents();
setVisible(true);
}
/**
* 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()
{
jButton1 = new javax.swing.JButton();
jButton1.setText("jButton1");
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
this.setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(325, 325, 325)
.addComponent(jButton1)
.addContainerGap(441, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap(239, Short.MAX_VALUE)
.addComponent(jButton1)
.addGap(218, 218, 218))
);
}// </editor-fold>
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
// End of variables declaration
}
I'm new to Java; please give the changes in detail.
回答1:
I need to change the contents of the panel defined inside a JInternalFrame
That statement implies you already have a visible JInternalFrame. Your posted code does not show any code for a JInternalFrame so I will assume you just want to swap panels on a button click.
Read the section from the Swing tutorial on How to Use Card Layout. This shows how to swap panels whether you are using a JInternalFrame or a JFrame.
回答2:
In this short, complete example, a javax.swing.Action is used to select frames from a menu via the internal frame's setSelected() method. You can reference any frame in the List<MyFrame> member variable.
来源：https://stackoverflow.com/questions/16982473/switching-between-internal-frames