java Date JDK8

package net.elaina.ZoneId;

import java.time.Instant;
import java.time.ZoneId;
import java.time.ZonedDateTime;

public class Test02 {
    public static void main(String[] args) {
        /*static Instant now( )                     获取当前时间的Instant对象(标准时间)
        static Instant ofXxxx(long epochMilli)      根据(秒/毫秒/纳秒)获取Instant对象
        ZonedDateTime atZone(ZoneId zone)           指定时区
        boolean isXxx(Instant otherInstant)         判断系列的方法
        Instant minusXxx(long millisToSubtract)     减少时间系列的方法
        Instant plusXxx(long millisToSubtract)      增加时间系列的方法*/

        //1.获取当前时间的Instant对象(标准时间)
        Instant now = Instant.now();
        System.out.println(now); // 2023-12-06T13:53:48.514158400Z

        //2.根据(秒/毫秒/纳秒)获取Instant对象
        Instant instant1 = Instant.ofEpochMilli(0L);
        System.out.println(instant1); //1970-01-01T00:00:00Z

        Instant instant2 = Instant.ofEpochSecond(1L);
        System.out.println(instant2); //1970-01-01T00:00:01Z

        Instant instant3 = Instant.ofEpochSecond(1L, 1000000000L);
        System.out.println(instant3); //1970-01-01T00:00:02Z

        //3.指定时区
        ZonedDateTime time = Instant.now().atZone(ZoneId.of("Asia/Shanghai"));
        System.out.println(time); //2023-12-06T22:14:50.854587800+08:00[Asia/Shanghai]

        //4.判断系列的方法
        Instant instant4 = Instant.ofEpochMilli(0L);
        Instant instant5 = Instant.ofEpochMilli(1000L);

        //isBefore:判断调用者代表的时间是否再参数表示时间的前面
        boolean result1 = instant4.isBefore(instant5);
        System.out.println(result1); //true

        //isAfter:判断调用者代表的时间是否在参数表示时间的后面
        boolean result2 = instant4.isAfter(instant5);
        System.out.println(result2); //false

        //5.减少时间系列的方法
        Instant instant6 = Instant.ofEpochMilli(3000L);
        System.out.println(instant6); //1970-01-01T00:00:03Z

        Instant instant7 = instant6.minusSeconds(1);
        System.out.println(instant7);//1970-01-01T00:00:02Z


    }
}