guessnumber.java

一个java的猜数字游戏 适合初学者

//file GuessNumber.java
//第三章,程序流程.
//通过日期：2003,11,3
//功能：猜四位数，7次机会。
//规模：89
import javax.swing.JOptionPane;//JOptionPane

public class GuessNumber
{
	public static void main(String[] args)
	{
		int a=0;//right number and right position
		int b=0;//wrong number and right position
		int count;//number of guess
		int[] original = new int[4];//right number
		int[] guess = new int[4];//number you have guessed
		String input;
        try{
		do{
			//product a new number
			for(int i=0;i<=3;i++)
			{
				original[i] = (int)(Math.random()*10);
				for(int j = 0;j<=i-1;j++)
				{
					if((i!=j)&&(original[i]==original[j]))
					   {
					   		i=i-1;
					   		break;
					   }
				}
			}
		   for(count=0;count<=7;count++)
		   {
		   		input = JOptionPane.showInputDialog
		   				("Please input your number(integer)");
		   		int number = Integer.parseInt(input);
		   		guess[0] = number/1000;
		   		guess[1] = number/100 - 10 * guess[0];
		   		guess[2] = number/10 - 100 * guess[0] - 10*guess[1];
		   		guess[3] = number%10;

		   		for(int i = 0;i<=3;i++)
		   		{
					for(int j = 0;j<=3;j++)
					{
						if(guess[i]==original[j])
						{
							if(i==j)a++;
							else b++;
						}
					}
				}
			    if(a==4)
			        {
				     JOptionPane.showMessageDialog(null,"You are so clever!",
				         "You win.",JOptionPane.INFORMATION_MESSAGE);
		            }
		        else
		            {
						for(int i = 0;i<=3;i++)
						{
							System.out.print(guess[i]);
						}
							System.out.println("  "+a+"A"+b+"B");
					}
		        a=0;
		        b=0;

		   }
		   JOptionPane.showMessageDialog(null,"You lose!",
		               "Right number is" + original[0] + original[1]
		                    + original[2] + original[3],
		                  JOptionPane.INFORMATION_MESSAGE);

		   input=JOptionPane.showInputDialog
		               ("Do you want to try again?(Y/N)");
		   input=input.toUpperCase();

		}while(input.equals("Y"));
	}
	  catch(Exception e)
	  {
		System.out.println("Something is wrong!");
		System.exit(0);
	  }

	}
}