小草的天空

package com.qpb.ant;

import java.util.ArrayList;
import java.util.List;
import java.util.Random;

public class TestRandom {
 
 public final static int TOTAL = 33;
 public final static int NUMBER = 7;
 
 public static void main(String[] args) {
      List<String> list = new ArrayList<String>();
      StringBuffer sb = new StringBuffer();
      Random r = new Random();
  
      for(int i = 0; i < TOTAL; i++) {
           list.add(i + 1 + "");
      }
  
      for(int j = 0; j < NUMBER; j++) {
           int size = list.size();
           String s = list.get(r.nextInt(size));
           sb.append(s);
           if(j != NUMBER -1) {
                sb.append(",");
           }
           list.remove(s);
      }
          System.out.println(sb.toString());
     }

}