multiplicationteacher.java

掷骰子游戏

// Exercise 15.16: MultiplicationTeacher.java
// This game asks the user to enter the product of two
// randomly generated numbers in the range 0-9.
import java.awt.*;
import java.awt.event.*;
import java.util.Random;
import javax.swing.*;

public class MultiplicationTeacher extends JFrame
{
   // JLabel and JTextField to question user and get answer
   private JLabel questionJLabel; 
   private JTextField answerJTextField;

   // JButton to submit answer
   private JButton submitJButton;

   // JLabel and JTextField to display if user is correct
   private JLabel resultJLabel; 
   private JTextField responseJTextField;

   // declare instance variables
   private int correctAnswer;

   // create new Random object
   private Random generator = new Random();

   // no-argument constructor
   public MultiplicationTeacher()
   {
      createUserInterface();
   }
   
   // 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 questionJLabel
      questionJLabel = new JLabel();
      questionJLabel.setBounds( 20, 16, 148, 23 );
      contentPane.add( questionJLabel );

      // set up answerJTextField
      answerJTextField = new JTextField();
      answerJTextField.setBounds( 176, 16, 48, 21 );
      contentPane.add( answerJTextField );

      // set up submitJButton
      submitJButton = new JButton();
      submitJButton.setBounds( 56, 48, 128, 23 );
      submitJButton.setText( "Submit Answer" );
      contentPane.add( submitJButton );
      submitJButton.addActionListener( 
      
         new ActionListener() // anonymous inner class
         {
            // event handler called when submitJButton is clicked
            public void actionPerformed( ActionEvent event )
            {
               submitJButtonActionPerformed( event );
            }
            
         } // end anonymous inner class
         
      ); // end call to addActionListener

      // set up resultJLabel
      resultJLabel = new JLabel();
      resultJLabel.setBounds( 8, 80, 40, 23 );
      resultJLabel.setText( "Result:" );
      contentPane.add( resultJLabel );

      // set up responseJTextField
      responseJTextField = new JTextField();
      responseJTextField.setBounds( 56, 80, 152, 23 );
      responseJTextField.setHorizontalAlignment( JTextField.CENTER );
      responseJTextField.setEditable( false );
      contentPane.add( responseJTextField );

      // set properties of application's window
      setTitle( "Multiplication Teacher" ); // set title bar string
      setSize( 247, 143 );                  // set window size
      setVisible( true );                   // display window

   } // end method createUserInterface
   
   // determine if user's guess is right
   private void submitJButtonActionPerformed( ActionEvent event )
   {

   } // end method submitJButtonActionPerformed
   
   // main method
   public static void main( String[] args )
   {
      MultiplicationTeacher application = 
         new MultiplicationTeacher();
      application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );

   } // end method main
   
} // end class MultiplicationTeacher

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