ex5_26.java

判断三角形

import javax.swing.JOptionPane;
public class Ex5_26{
   public static void main (String[] args) {
      char[] chess=new char[10];
      char[][] chessboard=new char[3][3];
      for(int i=1;i<10;i++){
         chess[i]=(char)(i+48);//1的ASCII码对应49
      }
      printboard(chess);
      while(true){//循环让A和B放置棋子直至某一方赢棋或和棋
      	int row = Integer.parseInt(JOptionPane.showInputDialog("请游戏者A输入行号(0~2)："));
        int col = Integer.parseInt(JOptionPane.showInputDialog("请游戏者A输入列号(0~2)："));
        while(true){
        	if(IsOn(row*3+col+1,chess)) {
        	    System.out.println("该位置已放置过棋子，请重新选择位置摆放");
        	     row = Integer.parseInt(JOptionPane.showInputDialog("请游戏者A输入行号(0~2)："));
                 col = Integer.parseInt(JOptionPane.showInputDialog("请游戏者A输入列号(0~2)："));
        	}
        	else break;
        }
        chessboard[row][col] = 'X';
        chess[row*3+col+1]='X';
        printboard(chess);
        if (Win('X',chess)) {
            System.out.println("游戏者A赢了！");
            System.exit(0);
        }
        else if (Draw(chess)){
             System.out.println("和棋！");
             System.exit(0);
        }
        row = Integer.parseInt(JOptionPane.showInputDialog("请游戏者B输入行号(0~2)："));
        col = Integer.parseInt(JOptionPane.showInputDialog("请游戏者B输入列号(0~2)："));
        while(true){
        	if(IsOn(row*3+col+1,chess)) {
        	    System.out.println("该位置已放置过棋子，请重新选择位置摆放");
        	    row = Integer.parseInt(JOptionPane.showInputDialog("请游戏者B输入行号(0~2)："));
                col = Integer.parseInt(JOptionPane.showInputDialog("请游戏者B输入列号(0~2)："));
        	}
        	else break;
        }
        chessboard[row][col] = 'O';
        chess[row*3+col+1]='O';
        printboard(chess);
        if (Win('O',chess)){
            System.out.println("游戏者B赢了！");
            System.exit(0);
         }
         else if (Draw(chess)){
            System.out.println("和棋！");
            System.exit(0);
         }
      }
   }
   static void printboard(char[] chess){//输出每一次的棋盘布局
      System.out.println("\n");
      System.out.println(" "+chess[1]+" "+"|"+" "+chess[2]+" "+"|"+" "+chess[3]);
      System.out.println("-----------");
      System.out.println(" "+chess[4]+" "+"|"+" "+chess[5]+" "+"|"+" "+chess[6]);
      System.out.println("-----------");
      System.out.println(" "+chess[7]+" "+"|"+" "+chess[8]+" "+"|"+" "+chess[9]);
      System.out.println("\n");
   }
   static boolean IsOn(int i,char[] chess){//判断该位置是否已放置过棋子
     if(chess[i]!=i+'0') return true;
     else return false;
   }
   static boolean Win(char c,char[] chess){//判断是否赢，即只需找到同一行，同一列或两条对角线的棋子全是某一方的即可
      for(int i=0;i<=2;i++)
      	if(chess[i*3+1]==c&&chess[i*3+2]==c&&chess[i*3+3]==c)
      	  return true;
      for(int i=0;i<=2;i++)
      	if(chess[i+1]==c&&chess[i+4]==c&&chess[i+7]==c)
      	  return true;
      if(chess[1]==c&&chess[5]==c&&chess[9]==c)
      	return true;
      if(chess[3]==c&&chess[5]==c&&chess[7]==c)
      	return true;
      else return false;
   }
   static boolean Draw(char[] chess){//判断和棋只需判断当前棋盘已下满且未有一方赢棋
      for(int i=1;i<=9;i++){
      	 char c=(char)(i+48);
         if(chess[i]==c)
            return false;
      }
      return true;
   }
}