List数组使用stream根据时间进行排序实现

柔光的暖阳◎ 2023-10-13 18:50 19阅读 0赞

## 1 效果 ##

## 1.1 乱序 ##

[
    Student{
        userName='张三', userNick='2', age=22, createTime='2022-12-02 2:11:00'}, 
    Student{
        userName='李四', userNick='1', age=23, createTime='2022-12-03 16:11:00'}, 
    Student{
        userName='王五', userNick='4', age=24, createTime='2022-12-01 21:11:00'}, 
    Student{
        userName='赵六', userNick='3', age=25, createTime='2022-12-02 22:11:00'}]

## 1.2 升序 ##

[
    Student{
        userName='王五', userNick='4', age=24, createTime='2022-12-01 21:11:00'}, 
    Student{
        userName='赵六', userNick='3', age=25, createTime='2022-12-02 22:11:00'},
    Student{
        userName='张三', userNick='2', age=22, createTime='2022-12-02 2:11:00'}, 
    Student{
        userName='李四', userNick='1', age=23, createTime='2022-12-03 16:11:00'}]

## 1.3 降序 ##

[
    Student{
        userName='李四', userNick='1', age=23, createTime='2022-12-03 16:11:00'}, 
    Student{
        userName='张三', userNick='2', age=22, createTime='2022-12-02 2:11:00'}, 
    Student{
        userName='赵六', userNick='3', age=25, createTime='2022-12-02 22:11:00'}, 
    Student{
        userName='王五', userNick='4', age=24, createTime='2022-12-01 21:11:00'}]

## 2 代码实现 ##

public class Test {
        
        public static void main(String[] args) throws IOException {
        
            //测试数据，请不要纠结数据的严谨性
            List<Student> studentList = new ArrayList<>();
            studentList.add(new Student("张三","2",22,"2022-12-02 2:11:00"));
            studentList.add(new Student("李四","1",23,"2022-12-03 16:11:00"));
            studentList.add(new Student("王五","4",24,"2022-12-01 21:11:00"));
            studentList.add(new Student("赵六","3",25,"2022-12-02 22:11:00"));
            //根据日期进行升序排序
            //乱序
            System.out.println("乱序"+studentList);
            //根据日期进行升序排序
            List<Student> studentsSortAsce = studentList.stream().sorted(Comparator.comparing(Student::getCreateTime)).collect(Collectors.toList());
            //根据日期进行降序排序
            List<Student> studentsSortDesc = studentList.stream().sorted(Comparator.comparing(Student::getCreateTime).reversed()).collect(Collectors.toList());
            //升序后输出
            System.out.println("升序"+studentsSortAsce);
            //降序后输出
            System.out.println("降序"+studentsSortDesc);
            
    
        }
    
    
    }
    
    class Student{
        
        private String userName;
        private String userNick;
        private int age;
        private String createTime;
    
        public Student() {
        
        }
    
        public Student(String userName, String userNick, int age, String createTime) {
        
            this.userName = userName;
            this.userNick = userNick;
            this.age = age;
            this.createTime = createTime;
        }
    
        @Override
        public String toString() {
        
            return "Student{" +
                    "userName='" + userName + '\'' +
                    ", userNick='" + userNick + '\'' +
                    ", age=" + age +
                    ", createTime='" + createTime + '\'' +
                    '}';
        }
    
        public String getUserName() {
        
            return userName;
        }
    
        public void setUserName(String userName) {
        
            this.userName = userName;
        }
    
        public String getUserNick() {
        
            return userNick;
        }
    
        public void setUserNick(String userNick) {
        
            this.userNick = userNick;
        }
    
        public int getAge() {
        
            return age;
        }
    
        public void setAge(int age) {
        
            this.age = age;
        }
    
        public String getCreateTime() {
        
            return createTime;
        }
    
        public void setCreateTime(String createTime) {
        
            this.createTime = createTime;
        }
    }