/**
* 从list中随机抽取元素
*
* @param list
* @param n
* @return void
* @throws
* @Title: createRandomList
* @Description: TODO
*/
private static List createRandomList(List list, int n) { // TODO Auto-generated method stub
Map map = new HashMap();
List listNew = new ArrayList(); if (list.size() <= n) { return list;
} else { while (map.size() < n) { int random = (int) (Math.random() * list.size()); if (!map.containsKey(random)) {
map.put(random, "");
System.out.println(random + "===========" + list.get(random));
listNew.add(list.get(random));
}
} return listNew;
}
}12345678910111213141516171819202122232425262728扩展：
截取list
list.subList(0, 2);