1 import org.junit.Test;
 2 
 3 import java.time.LocalDate;
 4 import java.time.LocalDateTime;
 5 import java.time.LocalTime;
 6 
 7 /**
 8  * LocalDate,LocalTime,LocalDateTime的使用
 9  * @author fu jingchao
10  * @creat 2021/12/2-17:22
11  */
12 public class JDK8DateTimeTest {
13     @Test
14     public void test1(){
15         //now():获取当前的日期、时间、日期+时间
16         LocalDate localDate = LocalDate.now();
17         LocalTime localTime = LocalTime.now();
18         LocalDateTime localDateTime = LocalDateTime.now();
19         System.out.println(localDate);//2021-12-02
20         System.out.println(localTime);//17:43:43.962
21         System.out.println(localDateTime);//2021-12-02T17:43:43.962
22 
23         //getXxx():获取相关的属性
24         System.out.println(localDateTime.getDayOfMonth());
25         System.out.println(localDateTime.getDayOfWeek());
26         System.out.println(localDateTime.getMonth());
27 
28         //of:指定时间创建对象
29         LocalDateTime localDateTime1 = LocalDateTime.of(2021,12,2,17,
30                 50,28);
31         System.out.println(localDateTime1);//2021-12-02T17:50:28
32 
33         //体现不可变性
34         //withXxx():设置相关的属性
35         LocalDate localDate1 = localDate.withDayOfMonth(22);
36         System.out.println(localDate);//2021-12-02
37         System.out.println(localDate1);//2021-12-22
38 
39         LocalDateTime localDateTime2 = localDateTime.withHour(4);//相当于设置成4点
40         System.out.println(localDateTime);//2021-12-03T14:09:37.680
41         System.out.println(localDateTime2);//2021-12-03T04:09:37.680
42 
43         //加
44         LocalDateTime localDateTime3 = localDateTime.plusMonths(3);
45         System.out.println(localDateTime);//2021-12-03T14:09:37.680
46         System.out.println(localDateTime3);//2022-03-03T14:09:37.680
47 
48         //减
49         LocalDateTime localDateTime4 = localDateTime.minusDays(3);
50         System.out.println(localDateTime);//2021-12-03T14:13:03.345
51         System.out.println(localDateTime4);//2021-11-30T14:13:03.345
52     }
53 }