根据总中奖概率，奖品数量。建立奖池，在奖池里随机一个。比较简单，也可以增加复杂度。看你的需要了。

 

     [代码][Java]代码     

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public static void main(String[] args) {
         double baseNum = 0.99 ;
         String product = "矿泉水,打火机,雨伞,指甲刀" ;
         String num = "2,2,2,1" ;
         String[] p = product.split( "," );
         String[] n = num.split( "," );
 
         java.util.Random ran = new java.util.Random();
         double base = ran.nextDouble();
 
         if (base > baseNum) {
             System.err.println( "没中奖" );
             return ;
         }
 
         List<String> list = new ArrayList<String>();
         for ( int i = 0 ; i < p.length; i++) {
             for ( int j = 0 ; j < Integer.parseInt(n[i]); j++) {
                 list.add(p[i]);
             }
         }
                 //TODO 打乱奖池数据
         int l = ran.nextInt(list.size());
         System.err.println(list.get(l));
 
     }