如何从Java中的m个数字列表中生成n个随机数？

Question

For example I have a list of 20 numbers and i try to random generate six of them without repeating them. Any ideas?

Answer 1

如果您有一个java.util.List ，则可以简单地对其进行洗牌并选择前六个。

Answer 2

An easy way is to randomly shuffle the list and then take the first six elements:

List<Number> population = ...your list of 20 numbers...
Collections.shuffle(population);
List<Number> sample = population.subList(0, 6);