摇摆：关闭一个框架，并在同一时刻打开另一个

Question

比方说，我有“登录”和“注册”框架，有上登录一个按钮叫“注册”，其中规定的“登陆”的知名度为false，并打开新的“注册“架起至此一切都OK了（登录框消失，注册出现帧） 这是我对于听众：

btnRegister.addActionListener(new ActionListener() 
    { 
     public void actionPerformed(ActionEvent e) { 
      try { 
       Register reg = new Register(that, connect); 
      } catch (SQLException e1) { 
       // TODO Auto-generated catch block 
       e1.printStackTrace(); 
      } 
     } 
    }); 

注册的构造函数中它会变成登录的知名度假，”那是登录类（即= this）和连接是用于数据库。 现在，当我尝试关闭“注册”框架并返回“登录”后尝试尝试时，问题就出现了 - 注册关闭，但登录不出现。我试图通过这两个简单的语句

login.setVisibility(true); // I have saved 'Login' frame into this login variable 
that.dispatchEvent(new WindowEvent(that,WindowEvent.WINDOW_CLOSING)); 

而不是仅仅改变可视性我试图创造“登陆”的新实例做，但是，这并不正常工作。

login = new Login(); 
login.setVisible(true); 
that.dispatchEvent(new WindowEvent(that, WindowEvent.WINDOW_CLOSING)); 

像这样的“登录”框架出现像几毫秒空白，没有内部组件。

Answer 1

这就是我用JPanel可视属性实现它的方式。

基本思路用户登录的

1. 展架/寄存器组是适当的大小说 （200,400）状的形式，
2. 在里面添加两个JPanels（登录和注册），大小（200,400 ），并隐藏任何一个说注册。
3. 你的框架看起来只有一种形式。
4. 当用户单击从登录面板注册按钮，你必须做两件事情

loginPanel.setVisible（假）; and registerPanel.serVisible（true）;

下面是完整的代码。 （NetBeans的）-JFrameForm

public class UserFrame extends javax.swing.JFrame { 

    /** 
    * Creates new form UserFrame 
    */ 
    public UserFrame() { 
     initComponents(); 
     jPanel2.setVisible(false); 
     this.setSize(200, 324); 
    } 

    /** 
    * 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() { 

     jPanel1 = new javax.swing.JPanel(); 
     jButton1 = new javax.swing.JButton(); 
     jButton2 = new javax.swing.JButton(); 
     jLabel1 = new javax.swing.JLabel(); 
     jPanel2 = new javax.swing.JPanel(); 
     jLabel2 = new javax.swing.JLabel(); 
     jButton3 = new javax.swing.JButton(); 

     setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); 

     jPanel1.setBackground(new java.awt.Color(255, 255, 255)); 

     jButton1.setText("Login"); 

     jButton2.setText("Register"); 
     jButton2.addActionListener(new java.awt.event.ActionListener() { 
      public void actionPerformed(java.awt.event.ActionEvent evt) { 
       jButton2ActionPerformed(evt); 
      } 
     }); 

     jLabel1.setText("Login"); 

     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.TRAILING) 
        .addComponent(jLabel1) 
        .addComponent(jButton1)) 
       .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
       .addComponent(jButton2) 
       .addContainerGap(38, Short.MAX_VALUE)) 
     ); 
     jPanel1Layout.setVerticalGroup(
      jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
      .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup() 
       .addGap(42, 42, 42) 
       .addComponent(jLabel1) 
       .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) 
       .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) 
        .addComponent(jButton1) 
        .addComponent(jButton2)) 
       .addContainerGap()) 
     ); 

     jLabel2.setText("Register"); 

     jButton3.setText("Done"); 
     jButton3.addActionListener(new java.awt.event.ActionListener() { 
      public void actionPerformed(java.awt.event.ActionEvent evt) { 
       jButton3ActionPerformed(evt); 
      } 
     }); 

     javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2); 
     jPanel2.setLayout(jPanel2Layout); 
     jPanel2Layout.setHorizontalGroup(
      jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
      .addGroup(jPanel2Layout.createSequentialGroup() 
       .addGap(50, 50, 50) 
       .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING) 
        .addComponent(jButton3) 
        .addComponent(jLabel2)) 
       .addContainerGap(103, Short.MAX_VALUE)) 
     ); 
     jPanel2Layout.setVerticalGroup(
      jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
      .addGroup(jPanel2Layout.createSequentialGroup() 
       .addGap(55, 55, 55) 
       .addComponent(jLabel2) 
       .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 221, Short.MAX_VALUE) 
       .addComponent(jButton3) 
       .addContainerGap()) 
     ); 

     javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); 
     getContentPane().setLayout(layout); 
     layout.setHorizontalGroup(
      layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
      .addGroup(layout.createSequentialGroup() 
       .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) 
       .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) 
       .addComponent(jPanel2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)) 
     ); 
     layout.setVerticalGroup(
      layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
      .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) 
      .addComponent(jPanel2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) 
     ); 

     pack(); 
    }// </editor-fold>       

    private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {           
     jPanel1.setVisible(true); 
     jPanel2.setVisible(false); 
    }           

    private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {           
     jPanel1.setVisible(false); 
     jPanel2.setVisible(true); 
    }           

    /** 
    * @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(UserFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
     } catch (InstantiationException ex) { 
      java.util.logging.Logger.getLogger(UserFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
     } catch (IllegalAccessException ex) { 
      java.util.logging.Logger.getLogger(UserFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
     } catch (javax.swing.UnsupportedLookAndFeelException ex) { 
      java.util.logging.Logger.getLogger(UserFrame.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 UserFrame().setVisible(true); 
      } 
     }); 
    } 

    // Variables declaration - do not modify      
    private javax.swing.JButton jButton1; 
    private javax.swing.JButton jButton2; 
    private javax.swing.JButton jButton3; 
    private javax.swing.JLabel jLabel1; 
    private javax.swing.JLabel jLabel2; 
    private javax.swing.JPanel jPanel1; 
    private javax.swing.JPanel jPanel2; 
    // End of variables declaration     
}