一个简单的掷骰子游戏

// 简单的投掷骰子游戏
import java.awt.*;
import java.awt.event.*;
import java.util.Random;
import javax.swing.*;
import javax.swing.border.*;

public class CrapsGame extends JFrame
{
// JPanel and TitledBorder to contain dice
private JPanel pointDiceJPanel;
private TitledBorder pointDiceTitledBorder;

// JLabels to display the die images in pointDiceJPanel
private JLabel pointDie1JLabel;
private JLabel pointDie2JLabel;

// JLabels to display the die images from the rolls of the dice
private JLabel die1JLabel;
private JLabel die2JLabel;

// JButtons to allow user to interact with game
private JButton playJButton;
private JButton rollJButton;

// JLabel and JTextField to show results of game
private JLabel resultJLabel;
private JTextField resultJTextField;

//constants representing winning dice rolls
private final int LUCKY_SEVEN = 7;
private final int YO_LEVEN = 11;

//constants representing losing dice rolls
private final int SNAKE_EYES = 2;
private final int TREY = 3;
private final int BOX_CARS = 12;
private final int CRAPS = 7;

//file name and directory constants
private final String FILE_PREFIX = "Images/die";
private final String FILE_SUFFIX = ".png";

//instance variables
private int myPoint = 0;
private Random randomObject = new Random();

// no-argument constructor
public CrapsGame()
{
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 pointDiceTitledBorder for use with pointDiceJPanel
pointDiceTitledBorder = new TitledBorder( "Point" );

// set up pointDiceJPanel
pointDiceJPanel = new JPanel();
pointDiceJPanel.setBounds(16,16,200,116);
pointDiceJPanel.setLayout(null);
pointDiceJPanel.setBorder(pointDiceTitledBorder);
contentPane.add( pointDiceJPanel );

// set up pointDie1JLabel
pointDie1JLabel = new JLabel();
pointDie1JLabel.setBounds(24,34,64,56);
pointDiceJPanel.add(pointDie1JLabel);

// set up pointDie2JLabel
pointDie2JLabel = new JLabel();
pointDie2JLabel.setBounds(120,34,64,56);
pointDiceJPanel.add(pointDie2JLabel);

// set up die1JLabel
die1JLabel = new JLabel();
die1JLabel.setBounds( 40, 150, 64, 64 );
contentPane.add( die1JLabel );

// set up die2JLabel
die2JLabel = new JLabel();
die2JLabel.setBounds( 136, 150, 64, 56 );
contentPane.add( die2JLabel );

// set up playJButton
playJButton = new JButton();
playJButton.setBounds( 232, 16, 88, 23 );
playJButton.setText( "Play" );
contentPane.add( playJButton );
playJButton.addActionListener(

new ActionListener() // anonymous inner class
{
// event handler called when playJButton is clicked
public void actionPerformed ( ActionEvent event )
{
playJButtonActionPerformed( event );
}

} // end anonymous inner class

); // end call to addActionListener

// set up rollJButton
rollJButton = new JButton();
rollJButton.setBounds( 232, 56, 88, 23 );
rollJButton.setText( "Roll" );
rollJButton.setEnabled( false );
contentPane.add( rollJButton );
rollJButton.addActionListener(

new ActionListener() // anonymous inner class
{
// event handler called when rollJButton is clicked
public void actionPerformed ( ActionEvent event )
{
rollJButtonActionPerformed( event );
}

} // end anonymous inner class

); // end call to addActionListener

// set up resultJLabel
resultJLabel = new JLabel();
resultJLabel.setBounds( 232, 90, 48, 16 );
resultJLabel.setText( "结果:" );
contentPane.add( resultJLabel );

// set up resultJTextField
resultJTextField = new JTextField();
resultJTextField.setBounds( 232, 106, 88, 24 );
resultJTextField.setHorizontalAlignment( JTextField.CENTER );
resultJTextField.setEditable( false );
contentPane.add( resultJTextField );

// set properties of application's window
setTitle( "掷骰子游戏" ); // set title bar string
setSize( 350, 250 ); // set window size
setVisible( true ); // display window

} // end method createUserInterface

// start new game of craps
private void playJButtonActionPerformed( ActionEvent event )
{
//clear point icons
pointDie1JLabel.setIcon(null);
pointDie2JLabel.setIcon(null);

//reset title of border
pointDiceTitledBorder.setTitle("骰子点数");
pointDiceJPanel.repaint();

int sumOfDice = rollDice(); //roll dice

//测定投掷结果
switch(sumOfDice)
{
case LUCKY_SEVEN:
case YO_LEVEN:
resultJTextField.setText("你赢了!!!");
break;

case SNAKE_EYES:
case TREY:
case BOX_CARS:
resultJTextField.setText("你输了");
break;

default:
myPoint = sumOfDice;
resultJTextField.setText("再撒一次!");

// show the dice images
pointDie1JLabel.setIcon( die1JLabel.getIcon() );
pointDie2JLabel.setIcon( die2JLabel.getIcon() );

pointDiceTitledBorder.setTitle(
"骰子点数是： " + sumOfDice);
pointDiceJPanel.repaint();

playJButton.setEnabled(false);
rollJButton.setEnabled(true);

}

} // end method playJButtonActionPerformed

// continue the game
private void rollJButtonActionPerformed( ActionEvent event )
{
int sumOfDice = rollDice();

if(sumOfDice == myPoint)
{
resultJTextField.setText("你赢了!!!");
rollJButton.setEnabled(false);
playJButton.setEnabled(true);

}
else if(sumOfDice == CRAPS)
{
resultJTextField.setText("(:你输了");

rollJButton.setEnabled(false);
playJButton.setEnabled(true);

}

} // end method rollJButtonActionPerformed

private int rollDice()
{
int die1 = 1 + randomObject.nextInt(6);
int die2 = 1 + randomObject.nextInt(6);

displayDie(die1JLabel,die1);
displayDie(die2JLabel,die2);

return die1 + die2;
}

private void displayDie(JLabel picDieJLabel,int face)
{
ImageIcon image =
new ImageIcon(FILE_PREFIX + face + FILE_SUFFIX);

picDieJLabel.setIcon(image);
}

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

} // end method main

} // end class CrapsGame