java连连看小游戏字符版

import java.util.Scanner;
import java.util.Random;
public class LinkGame {
	public static void main(String[] args){
		int rows = 0;
		int cols = 0;
		int range = 0;
		Scanner sc = new Scanner(System.in);
		do{
			System.out.println("请输入行数:");
			rows = sc.nextInt();
		}while(rows<2);
		do{
			System.out.println("请输入列数:");
			cols = sc.nextInt();
		}while(cols<2 || cols%2!=0);
		do{
			System.out.println("请输入游戏等级：");
			range = sc.nextInt();
		}while(range<5 || range>20);
		
		int [][] board = new int[rows][cols];
		genBoard(board,range);
		showBoard(board);
		System.out.println("************************");
		shuffleBoard(board);
		showBoard(board);
	}
	//给棋盘赋值
	public static void genBoard(int [][] board, int range){
		if(null==board){
			System.out.println("数组为空");
			return;
		}
		Random rd = new Random();
		for(int i=0; i<board.length; i++){
			for(int j=0; j<board[i].length-1; j+=2){
				board[i][j] = rd.nextInt(range)+1;
				board[i][j+1] = board[i][j]; 
			}
		}
	}
	//打印棋盘
	public static void showBoard(int [][] board){
		if(null==board){
			System.out.println("数组不能为空");
		}
		for(int[] arr:board){
			for(int a:arr){
				System.out.print(a+"\t");
			}
			System.out.println();
		}
	}
	//打乱棋盘顺序
	public static void shuffleBoard(int[][] board){
		Random rd = new Random();
		for(int i=0; i<board.length*board[0].length*200; i++){
			int x1 = rd.nextInt(board.length);
			int y1 = rd.nextInt(board[0].length);
			int x2 = rd.nextInt(board.length);
			int y2 = rd.nextInt(board[0].length);
			int temp = board[x1][y1];
			board[x1][y1] = board[x2][y2];
			board[x2][y2] = temp;
		}
		
	}
}