From 8679cfa32444d5211f251cd67704d4d5cd4d1dec Mon Sep 17 00:00:00 2001
From: xuxin <840198532@qq.com>
Date: Thu, 30 Jul 2026 11:03:33 +0800
Subject: [PATCH] =?UTF-8?q?s-day01-Instant=E7=B1=BB=20=EF=BC=88=E4=BB=A3?=
 =?UTF-8?q?=E6=9B=BFDate=EF=BC=89-=E6=97=B6=E9=97=B4=E6=88=B3?=
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---
 .../com/inmind/jdk8_date05/InstantDemo12.java | 37 +++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 s-day01/src/com/inmind/jdk8_date05/InstantDemo12.java

diff --git a/s-day01/src/com/inmind/jdk8_date05/InstantDemo12.java b/s-day01/src/com/inmind/jdk8_date05/InstantDemo12.java
new file mode 100644
index 0000000..86eed9c
--- /dev/null
+++ b/s-day01/src/com/inmind/jdk8_date05/InstantDemo12.java
@@ -0,0 +1,37 @@
+package com.inmind.jdk8_date05;
+
+import java.time.Instant;
+
+/**
+ * 代替Date类
+ * 目标：掌握Instant的使用。
+ *
+ * instant类：时间戳类------>秒,纳秒(毫秒+纳秒)
+ */
+public class InstantDemo12 {
+    public static void main(String[] args) {
+        //获取当前时间戳对象
+        Instant now = Instant.now();
+        System.out.println(now);//2026-07-30T02:54:10.265716800Z
+        //获取总秒数
+        long epochSecond = now.getEpochSecond();
+        System.out.println(epochSecond);
+
+        //获取不够1秒的纳秒数
+        long nano = now.getNano();
+        System.out.println(nano);
+
+        //加固定的纳秒值，然后返回一个新的instant对象
+        Instant instant1 = now.plusNanos(100);
+        Instant instant2 = now.minusNanos(100);
+        System.out.println(instant1);
+        System.out.println(instant2);
+
+        // Instant对象的作用：做代码的性能分析，或者记录用户的操作时间点
+        Instant start = Instant.now();
+        //代码的执行（50行代码的功能）
+        Instant end = Instant.now();
+        //todo 之后我们会用间隔来计算时间差！！！
+        //传统的Date类，只能精确到毫秒，并且是可变对象，而Instant可以精确到纳秒，并且不可改变对象，推荐使用Instant，但一般LocalDateTime也够用了
+    }
+}