如何从一个数组中生成随机数组

import java.util.ArrayList;
import java.util.List;
import java.util.Random;

public class Test {
	public static void main(String[] args) {
		List<Integer> list = new ArrayList<Integer>();
		list.add(2);
		list.add(3);
		list.add(5);
		list.add(7);
		int[] ret = getRandomArrayFromList(list,3);
		for(Integer val : ret)
			System.out.println(val);
	}
	public static int[] getRandomArrayFromList(List<Integer> list,int number){  
		int ret[] = new int[number];  
		Random random = new Random();
		for(int i=0;i<number;i++){
			if (list != null && list.size() > 0 ){  
				int ran = random.nextInt(list.size());
				ret[i] = list.get(ran);
				list.remove(ran);
			}  
		}
		return ret;  
		}  
	
}