list从小到大，排序----这么简单

public class LambdaTest {
    public static void main(String[] args) {
        List list = Arrays.asList(5,2,3,1,9);
        int N = list.size();
        int t = 0;
        Collections.sort(list);
        System.out.println("顺序--"+list);
        Collections.reverse(list);
        System.out.println("倒叙--"+list);
        Collections.shuffle(list);
        System.out.println("随机--"+list);
        
    }
}

　　

顺序--[1, 2, 3, 5, 9]
倒叙--[9, 5, 3, 2, 1]
随机--[9, 1, 5, 2, 3]