Collections 如何对集合进行排序呢?

Collections对基本元素排序

  list<Integer> list = new ArrayList<>();
  Collections.sort(list );

Collections对实体类元素排序

 
方式一:
   Collections.sort(list , (Bean b1, Bean b2) -> b2.getXxx().compareTo(b31.getXxx()));

方式二:
   list.sort(Comparator.comparing(Bean->method)))

倒序:
   Collections.reversed(list);

java8 Stream 排序

temp = temp.stream().sorted(Comparator.comparing(User::getAge)).collect(Collectors.toList());

stream对基础数据类型排序

List list = new ArrayList();
list.add(10);
list.add(22);
list.add(33);
list.add(55);
list.add(66);
list.add(77);
Stream sorted = list.stream().sorted();
System.out.println("----"+sorted.collect(Collectors.toList()));

shuffle将元素排序

Collections.shuffle(list);