lambda排序

lambda排序

list.stream().sorted(Comparator.comparing(Student::getName).reversed()).collect(Collectors.toList());

过滤

//查找名字为张三的员工信息，并打印出来
list.stream().filter(student-> StringUtils.equals("张三", student.getName())).collect(Collectors.toList());

累加

Integer sum = List6.stream().reduce(0, (a, b) -> (a + b));

分组

Map<Integer, List<String>> groups2 = list.stream().collect(Collectors.groupingBy(String::length));