//Java extension packages
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Craps extends JApplet implements ActionListener{
    //constant variables for game status
    final int WON=0, LOST=1,CONTINUE=2;
    
    //other variables used
    boolean firstRoll=true;   
    int sumOfDice=0;
    int myPoint=0;
    int gameStatus=CONTINUE;
    
    //
    JLabel die1Label,die2Label,sumLabel,pointLabel;
    JTextField die1Field,die2Field,sumField,pointField;
    JButton rollButton;
    public void init()    {
        Container container =  getContentPane();
        container.setLayout(new FlowLayout());
        
        //
        die1Label =new JLabel("Die 1");
        container.add(die1Label);
        die1Field=new JTextField(10);
        die1Field.setEditable(false);
        container.add(die1Field);
        
        //create label and text field for die 2
        die2Label=new JLabel("Die 2");
        container.add(die2Label);
        die2Field=new JTextField(10);
        die2Field.setEditable(false);
        container.add(die2Field);
        
        //create label and text field for sum
        sumLabel=new JLabel("Sum is");
        container.add(sumLabel);
        sumField=new JTextField(10);
        sumField.setEditable(false);
        container.add(sumField);
        
        //create label and text field for point
        pointLabel=new JLabel("Point is");
        container.add(pointLabel);
        pointField =new JTextField(10);
        pointField.setEditable(false);
        container.add(pointField);
        
        //create  button user clicks to roll dice
        rollButton=new JButton("Roll Dice");
        rollButton.addActionListener(this);
        container.add(rollButton);        
        
    //process one roll of dice
    }public void actionPerformed(ActionEvent actionEvent)    {
        //first roll of dice
        if (firstRoll)        {
            sumOfDice =rollDice();  //roll dice
            switch (sumOfDice)            {
              //win on first roll
            case 7: case 11:
                gameStatus=WON;
                pointField.setText("");  //clear point field
                break;
                
                //lose on first roll
            case 2: case 3: case 12:
                gameStatus = LOST;
                pointField.setText("");  //clear point field
                        break;
                
                //remember point
                default:
                    gameStatus = CONTINUE;
                    myPoint = sumOfDice ;
                    pointField.setText(Integer.toString(myPoint));
                    firstRoll = false;
                    break;
            }
        }
        
else {sumOfDice =rollDice();
        
            if(sumOfDice ==myPoint)
            gameStatus=WON;
            else if(sumOfDice ==7)
            gameStatus =LOST;
        }
        displayMessage();
        
    }
    public int rollDice()    {
        int die1,die2,sum;
        
        //pick random die values  
        die1=1+(int)(Math.random()*6);  //random    随机的 
        die2=1+(int)(Math.random()*6);
        
        sum=die1+die2;
        
        die1Field.setText(Integer.toString(die1));
        die2Field.setText(Integer.toString(die2));
        sumField.setText(Integer.toString(sum));
        return sum;
    }
    public void displayMessage()    {
        if(gameStatus==CONTINUE)
        showStatus("Roll again");
        
        else        {
            if(gameStatus==WON)
                showStatus("Player wins."+"Click Roll Dice to play again");
            else
                showStatus("Player loses."+"Click Roll Dice to play again");
            firstRoll=true;
            
        }
            
    }

}