JAVA 1.8JDK LIST 分组排序写一段代码

以下是 Java 1.8 JDK 中 List 分组排序的示例代码：

import java.util.*;
import java.util.stream.Collectors;

public class ListGroupingAndSortingExample {
    public static void main(String[] args) {
        // Sample data
        List<Employee> employees = Arrays.asList(
                new Employee("John", "Doe", 1000),
                new Employee("Jane", "Doe", 2000),
                new Employee("John", "Smith", 1500),
                new Employee("Jane", "Smith", 2500),
                new Employee("Bob", "Johnson", 3000),
                new Employee("Alice", "Johnson", 4000)
        );

        // Grouping by last name and sorting by salary
        Map<String, List<Employee>> groupedAndSorted = employees.stream()
                .sorted(Comparator.comparingInt(Employee::getSalary))
                .collect(Collectors.groupingBy(Employee::getLastName));

        // Printing results
        groupedAndSorted.forEach((lastName, employeeList) -> {
            System.out.println("Employees with last name " + lastName + ":");
            employeeList.forEach(System.out::println);
        });
    }
}

class Employee {
    private String firstName;
    private String lastName;
    private int salary;

    public Employee(String firstName, String lastName, int salary) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.salary = salary;
    }

    public String getFirstName() {
        return firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public int getSalary() {
        return salary;
    }

    @Override
    public String toString() {
        return firstName + " " + lastName + " (salary: " + salary + ")";
    }
}

这个示例代码将员工列表按照姓氏进行分组，并且按照薪水进行排序。最后，它将每个分组中的员工列表打印出来。你可以根据自己的需求修改这个示例代码。