进阶day01-LocalDate的基本使用（代替Calender）

javaSE-day01/src/com/inmind/jdk8_time04/LocalDateDemo12.java

@@ -0,0 +1,66 @@
+package com.inmind.jdk8_time04;
+
+import java.time.DayOfWeek;
+import java.time.LocalDate;
+import java.time.Month;
+
+/*
+static LocalDate now() 从默认时区的系统时钟获取当前日期。
+ */
+public class LocalDateDemo12 {
+    public static void main(String[] args) {
+        LocalDate ld = LocalDate.now();
+        System.out.println(ld);//LocalDate类的toString内容打印出来
+        // 1、获取日期对象中的信息
+        int year = ld.getYear();
+        int monthValue = ld.getMonthValue();
+        int day = ld.getDayOfMonth();
+        int dayOfWeek = ld.getDayOfWeek().getValue();
+        System.out.println(year);
+        System.out.println(monthValue);
+        System.out.println(day);
+        System.out.println(dayOfWeek);
+        System.out.println("---------------------------------");
+        // 2、直接修改某个信息: withYear、withMonth、withDayOfMonth、withDayOfYear
+        LocalDate ld1 = ld.withYear(2099);
+        LocalDate ld2 = ld.withMonth(12);
+        LocalDate ld3 = ld.withDayOfMonth(18);
+
+        System.out.println(ld);
+        System.out.println(ld1);
+        System.out.println(ld2);
+        System.out.println(ld3);
+        System.out.println("----------------------------------");
+        // 3、把某个信息加多少: plusYears、plusMonths、plusDays、plusWeeks
+        LocalDate ld4 = ld.plusYears(2);
+        LocalDate ld5 = ld.plusMonths(2);
+        LocalDate ld6 = ld.plusDays(2);
+        System.out.println(ld);
+        System.out.println(ld4);
+        System.out.println(ld5);
+        System.out.println(ld6);
+        System.out.println("---------------------------------------");
+        // 4、把某个信息减多少：minusYears、minusMonths、minusDays、minusWeeks
+
+        LocalDate ld7 = ld.minusYears(2);
+        LocalDate ld8 = ld.minusMonths(2);
+        LocalDate ld9 = ld.minusDays(2);
+        System.out.println(ld);
+        System.out.println(ld7);
+        System.out.println(ld8);
+        System.out.println(ld9);
+        System.out.println("------------------------------");
+
+        // 5、获取指定日期的LocalDate对象： public static LocalDate of(int year, int month, int dayOfMonth)
+        //来一个2099-9-9的LocalDate对象
+        LocalDate ld10 = LocalDate.of(2099, 9, 9);
+        LocalDate ld11 = LocalDate.of(2099, Month.SEPTEMBER, 9);
+        System.out.println(ld10);
+        System.out.println(ld11);
+        System.out.println("--------------------------------------------");
+        // 6、判断2个日期对象，是否相等，在前还是在后： equals isBefore isAfter
+        System.out.println(ld.equals(ld7));//false
+        System.out.println(ld.isBefore(ld7));//false
+        System.out.println(ld.isAfter(ld7));//true
+    }
+}