java8实现List排序

• 数值集合排序

  List list = Lists.newArrayList(3, 1, 2, -1);
  // 正序
  list.sort(Integer::compareTo);
  list.forEach((i) -> System.out.println(i));
  // 倒叙
  list.sort(Comparator.reverseOrder());
  list.forEach((i) -> System.out.println(i));
  // 正序
  list.sort(Comparator.naturalOrder());
  list.forEach((i) -> System.out.println(i));
  

• 根据对象中的某个属性进行排序

  Orange orange = new Orange();
  orange.setWeight(1.34);
  Orange orange1 = new Orange();
  orange1.setWeight(1.2);
  Orange orange2 = new Orange();
  orange2.setWeight(2.34);
  List list = Lists.newArrayList(orange, orange1, orange2);
  // 正序
  // weight属性为基本类型
  list1.sort((Orange s, Orange o) -> s.getWeight() > o.getWeight() ? 1 : s.getWeight() == o.getWeight() ? 0 : -1);
  // weight属性为封装类型
  list1.sort((o1,o2)->o1.getWeight().compareTo(o2.getWeight()));
  // 2.34-1.34-1.2
  list1.forEach((o) -> System.out.println(o.getWeight()));
  // 倒叙
  // weight属性为基本类型
  list1.sort((Orange s, Orange o) -> o.getWeight() > s.getWeight() ? 1 : o.getWeight() == s.getWeight() ? 0 : -1);
  // weight属性为封装类型
  list1.sort((o1,o2)->o2.getWeight().compareTo(o1.getWeight()));
  //1.2-1.34-2.34
  list1.sort((Orange s, Orange o) -> o.getWeight().compareTo(s.getWeight()));
  list1.forEach((o) -> System.out.println(o.getWeight()));
  

更多文章：
点击跳转CSDN博客
点击跳转简书博客
公众号：代码小搬运