securitypanel.java

电话号码薄应用程序

// Exercise 28.13: SecurityPanel.java
// Enable user to enter security codes specifying access privileges.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.text.DateFormat;
import java.util.*;

public class SecurityPanel extends JFrame
{
   // JLabel and JPasswordField for user to input security code
   private JLabel securityCodeJLabel;
   private JPasswordField securityCodeJPasswordField;

   // JButtons to represent security keypad
   private JButton oneJButton;
   private JButton twoJButton;
   private JButton threeJButton;
   private JButton fourJButton;
   private JButton fiveJButton;
   private JButton sixJButton;
   private JButton sevenJButton;
   private JButton eightJButton;
   private JButton nineJButton;
   private JButton clearJButton;
   private JButton zeroJButton;
   private JButton enterJButton;

   // JLabel, JTextArea and JScrollPane to display access log
   private JLabel accessLogJLabel;
   private JTextArea accessLogJTextArea;
   private JScrollPane accessLogJScrollPane;

   // no-argument constructor
   public SecurityPanel()
   {
      createUserInterface(); // set up GUI
   }

   // create and position GUI components; register event handlers
   private void createUserInterface()
   {
      // get content pane for attaching GUI components
      Container contentPane = getContentPane();
      
      // enable explicit positioning of GUI components
      contentPane.setLayout( null );

      // set up securityCodeJLabel
      securityCodeJLabel = new JLabel();
      securityCodeJLabel.setBounds( 16, 16, 90, 21 );
      securityCodeJLabel.setText( "Security code:" );
      contentPane.add( securityCodeJLabel );

      // set up securityCodeJPasswordField
      securityCodeJPasswordField = new JPasswordField();
      securityCodeJPasswordField.setBounds( 114, 16, 172, 26 );
      securityCodeJPasswordField.setEditable( false );
      contentPane.add( securityCodeJPasswordField );

      // set up oneJButton
      oneJButton = new JButton();
      oneJButton.setBounds( 80, 64, 50, 50 );
      oneJButton.setText( "1" );
      contentPane.add( oneJButton );
      oneJButton.addActionListener(

         new ActionListener() // anonymous inner class
         {
            // event handler called when oneJButton is pressed
            public void actionPerformed( ActionEvent event )
            {
               oneJButtonActionPerformed( event );
            }

         } // end anonymous inner class

      ); // end call to addActionListener

      // set up twoJButton
      twoJButton = new JButton();
      twoJButton.setBounds( 130, 64, 50, 50 );
      twoJButton.setText( "2" );
      contentPane.add( twoJButton );
      twoJButton.addActionListener(

         new ActionListener() // anonymous inner class
         {
            // event handler called when twoJButton is pressed
            public void actionPerformed( ActionEvent event )
            {
               twoJButtonActionPerformed( event );
            }

         } // end anonymous inner class

      ); // end call to addActionListener

      // set up threeJButton
      threeJButton = new JButton();
      threeJButton.setBounds( 180, 64, 50, 50 );
      threeJButton.setText( "3" );
      contentPane.add( threeJButton );
      threeJButton.addActionListener(

         new ActionListener() // anonymous inner class
         {
            // event handler called when threeJButton is pressed
            public void actionPerformed( ActionEvent event )
            {
               threeJButtonActionPerformed( event );
            }

         } // end anonymous inner class

      ); // end call to addActionListener

      // set up fourJButton
      fourJButton = new JButton();
      fourJButton.setBounds( 80, 114, 50, 50 );
      fourJButton.setText( "4" );
      contentPane.add( fourJButton );
      fourJButton.addActionListener(

         new ActionListener() // anonymous inner class
         {
            // event handler called when fourJButton is pressed
            public void actionPerformed( ActionEvent event )
            {
               fourJButtonActionPerformed( event );
            }

         } // end anonymous inner class

      ); // end call to addActionListener

      // set up fiveJButton
      fiveJButton = new JButton();
      fiveJButton.setBounds( 130, 114, 50, 50 );
      fiveJButton.setText( "5" );
      contentPane.add( fiveJButton );
      fiveJButton.addActionListener(

         new ActionListener() // anonymous inner class
         {
            // event handler called when fiveJButton is pressed
            public void actionPerformed( ActionEvent event )
            {
               fiveJButtonActionPerformed( event );
            }

         } // end anonymous inner class

      ); // end call to addActionListener

      // set up sixJButton
      sixJButton = new JButton();
      sixJButton.setBounds( 180, 114, 50, 50 );
      sixJButton.setText( "6" );
      contentPane.add( sixJButton );
      sixJButton.addActionListener(

         new ActionListener() // anonymous inner class
         {
            // event handler called when sixJButton is pressed
            public void actionPerformed( ActionEvent event )
            {
               sixJButtonActionPerformed( event );
            }

         } // end anonymous inner class

      ); // end call to addActionListener

      // set up sevenJButton
      sevenJButton = new JButton();
      sevenJButton.setBounds( 80, 164, 50, 50 );
      sevenJButton.setText( "7" );
      contentPane.add( sevenJButton );
      sevenJButton.addActionListener(

         new ActionListener() // anonymous inner class
         {
            // event handler called when sevenJButton is pressed
            public void actionPerformed( ActionEvent event )
            {
               sevenJButtonActionPerformed( event );
            }

         } // end anonymous inner class

      ); // end call to addActionListener

      // set up eightJButton
      eightJButton = new JButton();
      eightJButton.setBounds( 130, 164, 50, 50 );
      eightJButton.setText( "8" );
      contentPane.add( eightJButton );
      eightJButton.addActionListener(

         new ActionListener() // anonymous inner class
         {
            // event handler called when eightJButton is pressed
            public void actionPerformed( ActionEvent event )
            {
               eightJButtonActionPerformed( event );
            }

         } // end anonymous inner class

      ); // end call to addActionListener

      // set up nineJButton
      nineJButton = new JButton();
      nineJButton.setBounds( 180, 164, 50, 50 );
      nineJButton.setText( "9" );
      contentPane.add( nineJButton );
      nineJButton.addActionListener(

         new ActionListener() // anonymous inner class
         {
            // event handler called when nineJButton is pressed
            public void actionPerformed( ActionEvent event )
            {
               nineJButtonActionPerformed( event );
            }

         } // end anonymous inner class

      ); // end call to addActionListener

      // set up clearJButton
      clearJButton = new JButton();
      clearJButton.setBounds( 80, 214, 50, 50 );
      clearJButton.setText( "C" );
      contentPane.add( clearJButton );
      clearJButton.addActionListener(

         new ActionListener() // anonymous inner class
         {
            // event handler called when clearJButton is pressed
            public void actionPerformed( ActionEvent event )
            {
               clearJButtonActionPerformed( event );
            }