12.9

 1 import java.awt.*;
 2 import java.util.*;
 3 import javax.swing.*;
 4 import javax.swing.border.LineBorder;
 5  
 6 public class Test extends JFrame
 7 {
 8      
 9     public static void main(String[] args) {
10          
11         LineBorder lb = new LineBorder(Color.black,2);
12         Test t1 = new Test();
13         t1.setSize(320,200);
14         t1.setLayout(new GridLayout(1,3));
15         
16         int[] a = random(3,54);
17         
18         for(int i=0;i<3;i++){
19         t1.add(new JLabel(new ImageIcon("card/"+a[i]+".png")));}        
20         
21         t1.setDefaultCloseOperation(EXIT_ON_CLOSE);
22         t1.setLocationRelativeTo(null);
23         t1.setVisible(true);        
24     }
25     
26     
27     public static int[] random(int number,int max){
28         //从max中产生number个随机数
29         //output number from max value
30         int[] array1 = new int[number];
31 //        int[] array2 = new int[max];
32         array1[0] = (int)Math.round(Math.random()*max)+1;
33         
34         for(int i = 1; i < number; i++){  
35             array1[i] = (int)Math.round(Math.random()*max)+1;
36                 for(int j =0; j<i; j++){
37                     
38                 while(array1[i] == array1[j]){
39                 array1[i] = (int)Math.round(Math.random()*max)+1;
40                 }
41                 
42                 }
43         }
44         return array1;
45     }
46     
47 }