java 8 LocalDate 与 LocalDateTime 时间类的简单应用

 废话不多说，直接贴代码实例

@Test
	public void testTime() {
		//获取当前的时间
		LocalDate now = LocalDate.now();
		System.out.println(now);//结果：2018-09-13
		
		//指定月份，获取4月份的今天
		LocalDate withMonth = LocalDate.now().withMonth(4);
		System.out.println(withMonth);//2018-04-13
		//指定年份
		LocalDate withYear = LocalDate.now().withYear(2017);
		System.out.println(withYear);//2017-09-13
		
		//指定月份的多少号
		LocalDate withDayOfMonth = LocalDate.now().withDayOfMonth(30);
		System.out.println(withDayOfMonth);//2017-09-30
		
		//获取某月的第一天
		LocalDate withDayOfMonth2 = LocalDate.now().withMonth(10).withDayOfMonth(1);
		System.out.println(withDayOfMonth2);//2018-10-01
		
		//获取某月的最后一天
		LocalDate withDayOfMonth3 = LocalDate.now().withMonth(10);
		int lengthOfMonth = withDayOfMonth3.lengthOfMonth();
		LocalDate withDayOfMonth4 = withDayOfMonth3.withDayOfMonth(lengthOfMonth);
		System.out.println(withDayOfMonth4);//2018-10-31
		
		//日期格式化
		String format = LocalDate.now().format(DateTimeFormatter.ofPattern("yyyy年MM月"));
		System.out.println(format);//2018年09月
		
		//月份增加两个月
		LocalDate plusMonths = LocalDate.now().plusMonths(2);
		System.out.println(plusMonths);//2018-11-13
		
		//年增加
		LocalDate plusYears = LocalDate.now().plusYears(5);
		System.out.println(plusYears);//2023-09-13
		
		
		
		//获取当前的时间
		LocalDateTime atStartOfDay = LocalDateTime.now();
		System.out.println(atStartOfDay);//结果：2018-09-13T15:33:32.653
		
		/*
		 * LocalDateTime 与 LocalDate的很多方法基本一致，这里就不一一掩饰，感兴趣的朋友可以自    
          己探索
		 */
		
	}

LocalDateTime 与 LocalDate的很多方法基本一致，这里就不一一演示啦，感兴趣的朋友可以自己探索