我有一个简单的问题。
我想知道的是，使用foo.removeAll()，foo.revalidate()，foo.repaint()之后是否可以恢复面板的原始内容？
编辑：我正在使用网络豆。
根据要求，这是来自netbeans的initcomponents。
private void initComponents() {
pnl_login = new javax.swing.JPanel();
jPanel1 = new javax.swing.JPanel();
txtuser = new javax.swing.JTextField();
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
txtpass = new javax.swing.JPasswordField();
jButton7 = new javax.swing.JButton();
jButton8 = new javax.swing.JButton();
Main_Pane = new javax.swing.JPanel();
desktop = new javax.swing.JDesktopPane();
jButton3 = new javax.swing.JButton();
jButton2 = new javax.swing.JButton();
jButton1 = new javax.swing.JButton();
jButton4 = new javax.swing.JButton();
jButton5 = new javax.swing.JButton();
jButton6 = new javax.swing.JButton();
jButton9 = new javax.swing.JButton();
pnl_login.setLayout(new java.awt.GridBagLayout());
jLabel1.setText("Username");
jLabel2.setText("Password");
jButton7.setText("Login");
jButton7.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton7ActionPerformed(evt);
}
});
jButton8.setText("Exit");
jButton8.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton8ActionPerformed(evt);
}
});
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(jLabel1)
.addComponent(jLabel2)
.addComponent(txtpass)
.addComponent(txtuser, javax.swing.GroupLayout.PREFERRED_SIZE, 212, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(jButton7, javax.swing.GroupLayout.PREFERRED_SIZE, 100, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jButton8, javax.swing.GroupLayout.PREFERRED_SIZE, 100, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addContainerGap())
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addComponent(jLabel1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(txtuser, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jLabel2)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(txtpass, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton8)
.addComponent(jButton7))
.addContainerGap())
);
pnl_login.add(jPanel1, new java.awt.GridBagConstraints());
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setExtendedState(this.getExtendedState() | this.MAXIMIZED_BOTH);
setUndecorated(true);
getContentPane().setLayout(new java.awt.BorderLayout());
Main_Pane.setLayout(new java.awt.CardLayout());
desktop.setBackground(new java.awt.Color(255, 255, 255));
jButton3.setFont(new java.awt.Font("Nirmala UI", 1, 11)); // NOI18N
jButton3.setForeground(new java.awt.Color(22, 52, 255));
jButton3.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Icons/medical91.png"))); // NOI18N
jButton3.setText("Vital Signs");
jButton3.setContentAreaFilled(false);
jButton3.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
jButton3.setPreferredSize(new java.awt.Dimension(110, 51));
jButton3.setVerticalTextPosition(javax.swing.SwingConstants.BOTTOM);
jButton3.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton3ActionPerformed(evt);
}
});
jButton2.setFont(new java.awt.Font("Nirmala UI", 1, 11)); // NOI18N
jButton2.setForeground(new java.awt.Color(22, 52, 255));
jButton2.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Icons/bed30.png"))); // NOI18N
jButton2.setText("Bed Rest");
jButton2.setContentAreaFilled(false);
jButton2.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
jButton2.setPreferredSize(new java.awt.Dimension(110, 51));
jButton2.setVerticalTextPosition(javax.swing.SwingConstants.BOTTOM);
jButton2.addMouseListener(new java.awt.event.MouseAdapter() {
public void mousePressed(java.awt.event.MouseEvent evt) {
jButton2MousePressed(evt);
}
});
jButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton2ActionPerformed(evt);
}
});
jButton1.setFont(new java.awt.Font("Nirmala UI", 1, 11)); // NOI18N
jButton1.setForeground(new java.awt.Color(22, 52, 255));
jButton1.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Icons/medical12.png"))); // NOI18N
jButton1.setText("Issue Medicine");
jButton1.setContentAreaFilled(false);
jButton1.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
jButton1.setPreferredSize(new java.awt.Dimension(110, 51));
jButton1.setVerticalTextPosition(javax.swing.SwingConstants.BOTTOM);
jButton1.addMouseListener(new java.awt.event.MouseAdapter() {
public void mousePressed(java.awt.event.MouseEvent evt) {
jButton1MousePressed(evt);
}
});
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
jButton4.setFont(new java.awt.Font("Nirmala UI", 1, 11)); // NOI18N
jButton4.setForeground(new java.awt.Color(22, 52, 255));
jButton4.setText("Patient Profile");
jButton4.setContentAreaFilled(false);
jButton4.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
jButton4.setPreferredSize(new java.awt.Dimension(110, 51));
jButton4.setVerticalTextPosition(javax.swing.SwingConstants.BOTTOM);
jButton4.addMouseListener(new java.awt.event.MouseAdapter() {
public void mousePressed(java.awt.event.MouseEvent evt) {
jButton4MousePressed(evt);
}
});
jButton4.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton4ActionPerformed(evt);
}
});
jButton5.setFont(new java.awt.Font("Nirmala UI", 1, 11)); // NOI18N
jButton5.setForeground(new java.awt.Color(22, 52, 255));
jButton5.setText("Register Patient");
jButton5.setContentAreaFilled(false);
jButton5.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
jButton5.setPreferredSize(new java.awt.Dimension(110, 51));
jButton5.setVerticalTextPosition(javax.swing.SwingConstants.BOTTOM);
jButton5.addMouseListener(new java.awt.event.MouseAdapter() {
public void mousePressed(java.awt.event.MouseEvent evt) {
jButton5MousePressed(evt);
}
});
jButton5.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton5ActionPerformed(evt);
}
});
jButton6.setFont(new java.awt.Font("Nirmala UI", 1, 11)); // NOI18N
jButton6.setForeground(new java.awt.Color(22, 52, 255));
jButton6.setText("Consult Patient");
jButton6.setContentAreaFilled(false);
jButton6.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
jButton6.setPreferredSize(new java.awt.Dimension(110, 51));
jButton6.setVerticalTextPosition(javax.swing.SwingConstants.BOTTOM);
jButton6.addMouseListener(new java.awt.event.MouseAdapter() {
public void mousePressed(java.awt.event.MouseEvent evt) {
jButton6MousePressed(evt);
}
});
jButton6.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton6ActionPerformed(evt);
}
});
jButton9.setText("Show login");
jButton9.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton9ActionPerformed(evt);
}
});
javax.swing.GroupLayout desktopLayout = new javax.swing.GroupLayout(desktop);
desktop.setLayout(desktopLayout);
desktopLayout.setHorizontalGroup(
desktopLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(desktopLayout.createSequentialGroup()
.addContainerGap()
.addGroup(desktopLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(desktopLayout.createSequentialGroup()
.addComponent(jButton3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton5, javax.swing.GroupLayout.PREFERRED_SIZE, 138, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(desktopLayout.createSequentialGroup()
.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton4, javax.swing.GroupLayout.PREFERRED_SIZE, 138, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(desktopLayout.createSequentialGroup()
.addComponent(jButton2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(389, 389, 389)
.addComponent(jButton6, javax.swing.GroupLayout.PREFERRED_SIZE, 138, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(0, 0, Short.MAX_VALUE)))
.addContainerGap())
.addGroup(desktopLayout.createSequentialGroup()
.addGap(283, 283, 283)
.addComponent(jButton9)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
desktopLayout.setVerticalGroup(
desktopLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(desktopLayout.createSequentialGroup()
.addContainerGap()
.addGroup(desktopLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jButton3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jButton5, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(desktopLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(desktopLayout.createSequentialGroup()
.addComponent(jButton4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jButton6, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(desktopLayout.createSequentialGroup()
.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jButton2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGap(130, 130, 130)
.addComponent(jButton9)
.addContainerGap())
);
desktop.setLayer(jButton3, javax.swing.JLayeredPane.DEFAULT_LAYER);
desktop.setLayer(jButton2, javax.swing.JLayeredPane.DEFAULT_LAYER);
desktop.setLayer(jButton1, javax.swing.JLayeredPane.DEFAULT_LAYER);
desktop.setLayer(jButton4, javax.swing.JLayeredPane.DEFAULT_LAYER);
desktop.setLayer(jButton5, javax.swing.JLayeredPane.DEFAULT_LAYER);
desktop.setLayer(jButton6, javax.swing.JLayeredPane.DEFAULT_LAYER);
desktop.setLayer(jButton9, javax.swing.JLayeredPane.DEFAULT_LAYER);
Main_Pane.add(desktop, "card2");
getContentPane().add(Main_Pane, java.awt.BorderLayout.CENTER);
pack();
}