从一个List中随机取出特定数字的记录

public List
 
   getSubStringByRadom(List
  
    list, int count){ List backList = null; backList = new ArrayList
   
    (); Random random = new Random(); int backSum = 0; if (list.size() >= count) { backSum = count; }else { backSum = list.size(); } for (int i = 0; i < backSum; i++) { // 随机数的范围为0-list.size()-1 int target = random.nextInt(list.size()); backList.add(list.get(target)); list.remove(target); } return backList; }