diff --git a/s-day01/src/com/inmind/jdk8_date05/DateTimeFormaterDemo13.java b/s-day01/src/com/inmind/jdk8_date05/DateTimeFormaterDemo13.java new file mode 100644 index 0000000..89eedec --- /dev/null +++ b/s-day01/src/com/inmind/jdk8_date05/DateTimeFormaterDemo13.java @@ -0,0 +1,33 @@ +package com.inmind.jdk8_date05; + +import java.time.LocalDateTime; +import java.time.format.DateTimeFormatter; + +/* +DateTimeFormater类(代替SimpleDateFormat) +目标:掌握JDK 8新增的DateTimeFormatter格式化器的用法。 + */ +public class DateTimeFormaterDemo13 { + public static void main(String[] args) { + //1.创建格式化对象 + DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"); + //2.对时间对象格式化 + LocalDateTime now = LocalDateTime.now(); + String nowStr = dtf.format(now);// 正向格式化 + System.out.println(nowStr); + /* LocalDate localDate = LocalDate.now(); + String ldStr = dtf.format(localDate); + System.out.println(ldStr);*/ + + //3.格式化时间,其实还有一种方案。 + String nowStr1 = now.format(dtf);//反向格式化 + System.out.println(nowStr1); + + //4.解析时间:解析时间一般使用LocalDateTime提供的解析方法来解析。(String--->LocalDateTime) + System.out.println("-----------------"); + String dateStr = "2029-12-12 12:12:11"; + //能不能String转为时间对象,从而进行时间操作 + LocalDateTime localDateTime = LocalDateTime.parse(dateStr, dtf); + System.out.println(localDateTime); + } +}