企业官网建设流程全解析

交互式网站如何做,在线文字生成图片,大连工业大学,直播软件开发一个多少钱Java 日期时间 Java 提供了多套日期时间 API#xff0c;以下是主要类别的对比和常用方法总结#xff1a; 类别主要类线程安全可变性Java 版本特点传统日期Date, Calendar#xff0c;GregorianCalendar否可变1.0设计缺陷多#xff0c;不推荐使用新日期时间LocalDate, Loca…Java 日期时间Java 提供了多套日期时间 API以下是主要类别的对比和常用方法总结类别主要类线程安全可变性Java 版本特点传统日期Date, CalendarGregorianCalendar否可变1.0设计缺陷多不推荐使用新日期时间LocalDate, LocalTime, LocalDateTime, ZonedDateTime, ChronoUnit是不可变8设计良好推荐使用时间戳Instant是不可变8机器时间精确到纳秒格式化DateTimeFormatter是不可变8线程安全的格式化类LocalDate/DateTimeFormatterLocalDate/DateTimeFormatter 是 Java 8 引入的日期类LocalDate 用于表示不带时间的日期年-月-日DateTimeFormatter 用于格式化和解析日期时间对象。实例import java.time.LocalDate;import java.time.format.DateTimeFormatter;public class RunoobTest 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static void main(String[] args) {// 获取当前日期LocalDate today LocalDate.now();System.out.println(当前日期: today);// 创建特定日期LocalDate nationalDay LocalDate.of(2025, 10, 1);System.out.println(国庆节: nationalDay);// 日期加减LocalDate tomorrow today.plusDays(1);LocalDate nextMonth today.plusMonths(1);LocalDate lastYear today.minusYears(1);System.out.println(明天: tomorrow);System.out.println(下个月: nextMonth);System.out.println(去年今天: lastYear);}}以上实例输出结果为当前日期: 2025-05-01 国庆节: 2025-10-01 明天: 2025-05-02 下个月: 2025-06-01 去年今天: 2024-05-01新项目优先使用 java.time 包(Java 8)避免使用老旧的 Date 和 Calendar 类明确区分使用时区不需要时区LocalDate/LocalTime/LocalDateTime需要时区ZonedDateTime格式化时考虑线程安全使用 DateTimeFormatter 而非 SimpleDateFormat数据库交互JDBC 4.2 直接支持 java.time 类型旧版本可转换为 java.sql.Date/Timestamp1. LocalDate (日期)实例LocalDate today LocalDate.now();LocalDate date LocalDate.of(2023, Month.JUNE, 15);int year date.getYear(); // 2023Month month date.getMonth(); // JUNEint day date.getDayOfMonth(); // 15LocalDate nextWeek today.plusWeeks(1);boolean isLeap date.isLeapYear(); // 是否闰年2. LocalTime (时间)实例LocalTime now LocalTime.now();LocalTime time LocalTime.of(14, 30, 45); // 14:30:45int hour time.getHour(); // 14int minute time.getMinute(); // 30LocalTime nextHour time.plusHours(1);3. LocalDateTime (日期时间)实例LocalDateTime ldt LocalDateTime.now();LocalDateTime dt LocalDateTime.of(2023, 6, 15, 14, 30);LocalDateTime nextMonth dt.plusMonths(1);4. ZonedDateTime (带时区日期时间)实例ZonedDateTime zdt ZonedDateTime.now(ZoneId.of(Asia/Shanghai));ZonedDateTime nyTime zdt.withZoneSameInstant(ZoneId.of(America/New_York));ZoneId zone zdt.getZone(); // 获取时区5. Instant (时间戳)实例Instant now Instant.now(); // 获取当前时间戳Instant later now.plusSeconds(60); // 60秒后long epochMilli now.toEpochMilli(); // 获取毫秒时间戳Date 类java.util 包提供了 Date 类来封装当前的日期和时间。 Date 类提供两个构造函数来实例化 Date 对象。第一个构造函数使用当前日期和时间来初始化对象。Date( )第二个构造函数接收一个参数该参数是从 1970 年 1 月 1 日起的毫秒数。Date(long millisec)