如何將兩個單獨的JPanel添加到一起以獲得1個JPanel？

Question

我想在時間顯示程序中做一個登錄。我很難嘗試將時鐘放入已製作好的JPanel中。當我運行該程序時，它目前彈出2個獨立的JPanel。請幫助任何建議。

CODE：

private static JLabel lblUserName; 
private static JTextField txtUserName; 
private static JButton btnSignIn; 
private static JLabel lblPassword; 
private static JPasswordField txtPassword; 
private static JButton btnCancel; 
private static JTabbedPane tabbedPane; 

public static void main(String[] args) 
    { 
      UserSignIn frame = new UserSignIn(); 
      JFrame frm = new JFrame(); 

      SimpleDigitalClock clock1 = new SimpleDigitalClock(); 
      frm.add(clock1); 

      //Pack 
      frm.pack(); 
      frame.pack(); 

      // Set origional focus on User Name text field 
      txtUserName.requestFocusInWindow(); 

      // Make Visible 
      frame.setVisible(true); 
      frm.setVisible(true); 



    } 

static class SimpleDigitalClock extends JPanel 
    { 
    String stringTime; 
    int hour, minute, second; 
    String aHour = ""; 
    String bMinute = ""; 
    String cSecond = ""; 
    public void setStringTime(String abc) 
     { 
     this.stringTime = abc; 
     } 
    public int Number(int a, int b) 
     { 
     return (a <= b) ? a : b; 
     } 
    SimpleDigitalClock() 
     { 
     Timer t = new Timer(1000, new ActionListener() 
      { 
      public void actionPerformed(ActionEvent e) 
       { 
       repaint(); 
       } 
      }); 
     t.start(); 
     } 
    @Override 
    public void paintComponent(Graphics v) 
    { 
     super.paintComponent(v); 
     Calendar rite = Calendar.getInstance(); 
     hour = rite.get(Calendar.HOUR_OF_DAY); 
     minute = rite.get(Calendar.MINUTE); 
     second = rite.get(Calendar.SECOND); 
     if (hour < 10) 
     { 
      this.aHour = "0"; 
     } 
     if (hour >= 10) 
     { 
      this.aHour = ""; 
     } 
     if (minute < 10) 
     { 
      this.bMinute = "0"; 
     } 
     if (minute >= 10) 
     { 
      this.bMinute = ""; 
     } 
     if (second < 10) 
     { 
      this.cSecond = "0"; 
     } 
     if (second >= 10) 
     { 
      this.cSecond = ""; 
     } 
     setStringTime(aHour + hour + ":" + bMinute+ minute + ":" + cSecond + second); 
     v.setColor(Color.RED); 
     int length = Number(this.getWidth(),this.getHeight()); 
     Font Font1 = new Font("Digital", Font.BOLD, length/5); 
     v.setFont(Font1); 
     v.drawString(stringTime, (int) length/6, length/2); 
    } 
    @Override 
    public Dimension getPreferredSize() 
    { 
     return new Dimension(200, 200); 
    } 
    } 

public UserSignIn() 
    { 
    initGUI(); 

} 

public void initGUI() 
    { 

    setTitle("Login"); 

    JPanel pnlUserSignIn = new JPanel(new GridBagLayout()); 
    this.getContentPane().add(pnlUserSignIn); 

      //build table for employees signed in 
    JTable t = new JTable(null); 

    JLabel label = new JLabel("Employees Currently Signed In"); 


      // ROW 1 BUTTONS 
      // Username and Sign In buttons 
    lblUserName = new JLabel("Username: "); 
    txtUserName = new JTextField("Username"); 

      // Actions 
      //txtUserName.addMouseListener(this); 


      // Adding objects to Panel 
      JPanel pnlLogin = new JPanel(); 
      pnlLogin.add(lblUserName); 
      pnlLogin.add(txtUserName); 


      //ROW 2 BUTTONS 
      //Password and Cancel 
      btnSignIn = new JButton("Sign In"); 
      btnCancel=new JButton("Cancel"); 

      //Actions 
      btnSignIn.addActionListener(this); 
      btnCancel.addActionListener(this); 

      // Adding objects to Panel 
    JPanel pnlPassword = new JPanel(); 
      pnlPassword.add(btnSignIn); 
    pnlPassword.add(btnCancel); 

    JPanel detailsPanel = new JPanel(); 
    detailsPanel.setBorder(BorderFactory.createLineBorder(Color.BLACK)); 

    GridBagConstraints gbc = new GridBagConstraints(); 

      // Putting Objects into the grid 
    gbc.gridx = 0; 
    gbc.gridy = 0; 

    pnlUserSignIn.add(label, gbc); 

    gbc.gridx = 0; 
      gbc.gridy = 1; 
    pnlUserSignIn.add(new JScrollPane(t), gbc); 

    gbc.gridx = 0; 
    gbc.gridy = 2; 
    pnlUserSignIn.add(pnlLogin, gbc); 

    gbc.gridx = 0; 
    gbc.gridy = 3; 
    gbc.gridwidth = 2; 
    pnlUserSignIn.add(pnlPassword, gbc); 

    //gbc.gridx = 1; 
    //gbc.gridy = 1; 
    //gbc.gridwidth = 1; 
    //gbc.gridheight = 2; 
    //panel.add(detailsPanel, gbc); 

    this.pack(); 

    this.setVisible(true); 
} 

@Override 
public void actionPerformed(ActionEvent actionEvent) 
{ 

    if(actionEvent.getSource()==btnCancel) 
    { 
     System.exit(0); 
    } 
    //if(actionEvent.getSource()==txtUserName) 
    //{ 
    // txtUserName.setText(""); 
    // txtUserName.requestFocus(); 
    //} 
} 

請忽略註釋代碼，我在一次對很多事情的工作。

Answer 1

你不需要另一個框架。只需將時鐘添加到現有的時鐘。例如到南方：

import java.awt.BorderLayout; 
import java.awt.Color; 
import java.awt.Dimension; 
import java.awt.Font; 
import java.awt.Graphics; 
import java.awt.GridBagConstraints; 
import java.awt.GridBagLayout; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.util.Calendar; 

import javax.swing.BorderFactory; 
import javax.swing.JButton; 
import javax.swing.JFrame; 
import javax.swing.JLabel; 
import javax.swing.JPanel; 
import javax.swing.JPasswordField; 
import javax.swing.JScrollPane; 
import javax.swing.JTabbedPane; 
import javax.swing.JTable; 
import javax.swing.JTextField; 
import javax.swing.Timer; 

public class UserSignIn extends JFrame implements ActionListener{ 
    private static JLabel lblUserName; 
    private static JTextField txtUserName; 
    private static JButton btnSignIn; 
    private static JLabel lblPassword; 
    private static JPasswordField txtPassword; 
    private static JButton btnCancel; 
    private static JTabbedPane tabbedPane; 

    public static void main(String[] args) { 
     UserSignIn frame = new UserSignIn(); 

     SimpleDigitalClock clock1 = new SimpleDigitalClock(); 
     frame.add(clock1, BorderLayout.SOUTH); 

     // Pack 
     frame.pack(); 

     // Set origional focus on User Name text field 
     txtUserName.requestFocusInWindow(); 

     // Make Visible 
     frame.setVisible(true); 
    } 

    static class SimpleDigitalClock extends JPanel { 
     String stringTime; 
     int hour, minute, second; 
     String aHour = ""; 
     String bMinute = ""; 
     String cSecond = ""; 

     public void setStringTime(String abc) { 
      this.stringTime = abc; 
     } 

     public int Number(int a, int b) { 
      return (a <= b) ? a : b; 
     } 

     SimpleDigitalClock() { 
      Timer t = new Timer(1000, new ActionListener() { 
       public void actionPerformed(ActionEvent e) { 
        repaint(); 
       } 
      }); 
      t.start(); 
     } 

     @Override 
     public void paintComponent(Graphics v) { 
      super.paintComponent(v); 
      Calendar rite = Calendar.getInstance(); 
      hour = rite.get(Calendar.HOUR_OF_DAY); 
      minute = rite.get(Calendar.MINUTE); 
      second = rite.get(Calendar.SECOND); 
      if (hour < 10) { 
       this.aHour = "0"; 
      } 
      if (hour >= 10) { 
       this.aHour = ""; 
      } 
      if (minute < 10) { 
       this.bMinute = "0"; 
      } 
      if (minute >= 10) { 
       this.bMinute = ""; 
      } 
      if (second < 10) { 
       this.cSecond = "0"; 
      } 
      if (second >= 10) { 
       this.cSecond = ""; 
      } 
      setStringTime(aHour + hour + ":" + bMinute + minute + ":" + cSecond 
        + second); 
      v.setColor(Color.RED); 
      int length = Number(this.getWidth(), this.getHeight()); 
      Font Font1 = new Font("Digital", Font.BOLD, length/5); 
      v.setFont(Font1); 
      v.drawString(stringTime, (int) length/6, length/2); 
     } 

     @Override 
     public Dimension getPreferredSize() { 
      return new Dimension(200, 200); 
     } 
    } 

    public UserSignIn() { 
     initGUI(); 

    } 

    public void initGUI() { 

     setTitle("Login"); 

     JPanel pnlUserSignIn = new JPanel(new GridBagLayout()); 
     this.getContentPane().add(pnlUserSignIn); 

     // build table for employees signed in 
     JTable t = new JTable(null); 

     JLabel label = new JLabel("Employees Currently Signed In"); 

     // ROW 1 BUTTONS 
     // Username and Sign In buttons 
     lblUserName = new JLabel("Username: "); 
     txtUserName = new JTextField("Username"); 

     // Actions 
     // txtUserName.addMouseListener(this); 

     // Adding objects to Panel 
     JPanel pnlLogin = new JPanel(); 
     pnlLogin.add(lblUserName); 
     pnlLogin.add(txtUserName); 

     // ROW 2 BUTTONS 
     // Password and Cancel 
     btnSignIn = new JButton("Sign In"); 
     btnCancel = new JButton("Cancel"); 

     // Actions 
     btnSignIn.addActionListener(this); 
     btnCancel.addActionListener(this); 

     // Adding objects to Panel 
     JPanel pnlPassword = new JPanel(); 
     pnlPassword.add(btnSignIn); 
     pnlPassword.add(btnCancel); 

     JPanel detailsPanel = new JPanel(); 
     detailsPanel.setBorder(BorderFactory.createLineBorder(Color.BLACK)); 

     GridBagConstraints gbc = new GridBagConstraints(); 

     // Putting Objects into the grid 
     gbc.gridx = 0; 
     gbc.gridy = 0; 

     pnlUserSignIn.add(label, gbc); 

     gbc.gridx = 0; 
     gbc.gridy = 1; 
     pnlUserSignIn.add(new JScrollPane(t), gbc); 

     gbc.gridx = 0; 
     gbc.gridy = 2; 
     pnlUserSignIn.add(pnlLogin, gbc); 

     gbc.gridx = 0; 
     gbc.gridy = 3; 
     gbc.gridwidth = 2; 
     pnlUserSignIn.add(pnlPassword, gbc); 

     // gbc.gridx = 1; 
     // gbc.gridy = 1; 
     // gbc.gridwidth = 1; 
     // gbc.gridheight = 2; 
     // panel.add(detailsPanel, gbc); 

     this.pack(); 

     this.setVisible(true); 
    } 

    @Override 
    public void actionPerformed(ActionEvent actionEvent) { 

     if (actionEvent.getSource() == btnCancel) { 
      System.exit(0); 
     } 
     // if(actionEvent.getSource()==txtUserName) 
     // { 
     // txtUserName.setText(""); 
     // txtUserName.requestFocus(); 
     // } 
    } 
}