References: [1] http://tutorials.jenkov.com/java-date-time/index.html [2] https://docs.oracle.com/javase/tutorial/datetime/iso/period.html 1. Java 8 and Java 7 Date classes The main change in the Java 8 date time API is that date and time is now no l…

In Java, a utility class is a class that defines a set of methods that perform common functions. This post shows the most frequently used Java utility classes and their most commonly used methods. Both the class list and their method list are ordered…

package cn.jiu.com; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; /* * 利用 java Date 来计算所活天数! * */ public class TianShu02 { public static void main(String[] args) throws ParseException { add(); } public sta…

jackson/fastjson序列化/反序列化: 默认情况下,jackson/fastjson将java Date/Timestamp类型序列化为时间戳,也就是1970年1月1日0点以来的毫秒数.如果要显示为用户友好表示: Jackson 可以: SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); objectMapper.setDateFormat(sdf)或者:@JsonFormat(locale…

Java Date and Calendar examples This tutorial shows you how to work with java.util.Date and java.util.Calendar. 1. Java Date ExamplesFew examples to work with Date APIs. Example 1.1 – Convert Date to String. SimpleDateFormat sdf = new SimpleDateForma…

鄙人最近尝试着翻译了自己的第一篇英文技术文档.Java Nested Classes Reference From Oracle Documentation 目录 嵌套类-Nested Classes 为什么使用嵌套类-Why Use Nested Classes? 静态嵌套类-Static Nested Classes 内部类-Inner Classes 局部类-Local Classes 匿名类-Anonymous Classes 变量覆盖问题-Shadowing 序列化问题-Seriali…

本文目的:掌握 Java 中日期和时间常用 API 的使用. 参考:Jakob Jenkov的英文教程Java Date Time Tutorial 和 JavaDoc 概览 Java 8 新增 API Java 8 部分新类 描述 Instant 表示时间线上的某一瞬间,用秒和纳秒表示. Duration 表示时间差,用秒和纳秒表示. LocalDate 表示没有时区信息的日期,例如生日.法定假日等. LocalTime 表示没有时区信息的一天中的本地时间. LocalDateTime 表示没…

When thinking about inner classes in java, the first thing that comes to my mind is that, WHY do we need to add inner classes to normal one? Leave alone all the specific details of the Java syntax, I think the reason is quite SIMPLE: we are human bei…

MInimize the accessibility of classes and members 这个叫做所谓的 information hiding ,这么做在于让程序耦合度更低,增加程序的健壮性等等,反正就是很有必要和有用. 四个修饰等级  private :只能当前class中调用 package-praivate 声明class,没有修饰的时候是默认 package-praivate,表示在一个 package里面使用 protect  subclass里面调用 public 任意地方…

From https://www.ntu.edu.sg/home/ehchua/programming/java/DateTimeCalendar.html Date and Time - Creation, Operation and Formatting Introduction There are many Java classes available for date/time and it becomes pretty confusing, in particular, the Dat…