Java简易撞鬼游戏demo

9*9方格内两点随机行走，相遇则停止。
 1 public class 撞鬼 {
 2 
 3     public static int length = 9;
 4     public static char[][] matrix = new char[length][length];
 5     public static int firstx = length - length;
 6     public static int firsty = length - length;
 7     public static int secondx = length - 1;
 8     public static int secondy = length - 1;
 9     
10     public static void main(String[] args) {
11         
12         final int timeInterval = 333;
13         
14         for(int i=length - length;i<length;i++){
15             for(int j=length - length;j<length;j++){
16                 matrix[i][j] = '○';
17                 if((i==j&&i==(length - length))||(i==j&&i==(length-1))){
18                     matrix[i][j] = '●';
19                 }
20             }
21         }
22         
23         Runnable runnable = new Runnable() {
24             public void run() {
25                 while (true) {
26                     try {
27                         for(int i=length - length;i<length;i++){
28                             for(int j=length - length;j<length;j++){
29                                 System.out.print(matrix[i][j]);
30                                 System.out.print(' ');
31                             }
32                             System.out.println();
33                         }
34                         if(firstx==secondx&&firsty==secondy){
35                             break;
36                         }
37                         changePosition();
38                         Thread.sleep(timeInterval);
39                     } catch (InterruptedException e) {
40                         e.printStackTrace();
41                     }
42                 }
43             }
44         };
45         Thread thread = new Thread(runnable);
46         thread.start();
47         
48     }
49     
50     public static void changePosition(){
51         double randomfirst = Math.random();
52         double randomsecond = Math.random();
53         if(randomfirst<0.25){
54             if(firstx>length - length){
55                 matrix[firstx--][firsty] = '○';
56                 matrix[firstx][firsty] = '●';
57             }
58         }else if(randomfirst<0.50){
59             if(firstx<length - 1){
60                 matrix[firstx++][firsty] = '○';
61                 matrix[firstx][firsty] = '●';
62             }
63         }else if(randomfirst<0.75){
64             if(firsty>length - length){
65                 matrix[firstx][firsty--] = '○';
66                 matrix[firstx][firsty] = '●';
67             }
68         }else{
69             if(firsty<length - 1){
70                 matrix[firstx][firsty++] = '○';
71                 matrix[firstx][firsty] = '●';
72             } 
73         }
74         if(randomsecond<0.25){
75             if(secondx>length - length){
76                 matrix[secondx--][secondy] = '○';
77                 matrix[secondx][secondy] = '●';
78             }
79         }else if(randomsecond<0.50){
80             if(secondx<length - 1){
81                 matrix[secondx++][secondy] = '○';
82                 matrix[secondx][secondy] = '●';
83             }
84         }else if(randomsecond<0.75){
85             if(secondy>length - length){
86                 matrix[secondx][secondy--] = '○';
87                 matrix[secondx][secondy] = '●';
88             }
89         }else{
90             if(secondy<length - 1){
91                 matrix[secondx][secondy++] = '○';
92                 matrix[secondx][secondy] = '●';
93             } 
94         }
95     }
96         
97 }