利用Java实现一个双色球抽奖的随机算法

class myLuck 
{    
  private int mTarget;  
  List<Integer> mNums = new ArrayList<Integer>(); //摇奖池
  
  ///从多少个数中产生多少个数
  ///例如 33选6 则Source=33，Target=6；
  myLuck(int vSource,int vTarget) {    
    for (int i = 1; i <=vSource ; i++) {      
      mNums.add(i);
    }
    mTarget=vTarget;
  }
  
  public String GetNums()
  {    
    String xString="";
    for (int i =0;i<mTarget; i++) 
    {
      int _index=(int)(Math.random()* mNums.size());
      xString+=mNums.get(_index)+" ";
      //System.out.print("("+(_index+1)+")"+mNums.get(_index)+"-");  
      //如何删除一个元素
      mNums.remove(_index);
    }  
    return xString;
  }  
}

myLuck _red=new myLuck(33, 6);  
myLuck _blue=new myLuck(16,1);
String Str =_red.GetNums() +"，"+_blue.GetNums();