获取日期的两种方法：LocalDate和Calendar

获取当前日期年月日的两种方法：

import java.time.LocalDate;
import java.time.temporal.TemporalAdjusters;
import java.util.Calendar;
import java.util.Date;
//年月日
public class DateShow {
	public static void main(String args[]) {
			
		//方法一：
		LocalDate now = LocalDate.now();
		int lengthOfMonth = now.lengthOfMonth();//当前月的天数
		int mon = now.getMonthValue();//当前月的月份
		int year = now.getYear();               //获取当前年份
	//	int lengthOfMonth = now.lengthOfMonth();
		int day = now.getDayOfMonth();        //获取当前日期，今天是几号
		String dateString = now.toString(); // 返回的字符串格式为"yyyy-MM-dd"
		
		
		System.out.println("方法一：");
		System.out.println("今天是"+now);
		System.out.println("今天是"+dateString);
		System.out.println("今年是"+year+"年"+"\t"+"今天是"+mon+"月"+"\t"+"今天是"+day+"号"+"\t"+"这个月有"+lengthOfMonth+"天");
		
		
		//方法二
		
	
		 Calendar calendar = Calendar.getInstance();
		 Date da=calendar.getTime();
		 int year1 = Calendar.getInstance().get(Calendar.YEAR);    //年   
		int mon1 = calendar.get(Calendar.MONTH);                   //月
//		int day=Calendar.getInstance().get(Calendar.DAY_OF_MONTH);    //这个方法也可以
		int day1 = calendar.get(Calendar.DATE);                    //日
		int hour1 = calendar.get(Calendar.HOUR_OF_DAY);            //时
		int min1 = calendar.get(Calendar.MINUTE);                  //分
		int second1 = calendar.get(Calendar.SECOND);               //秒
		
		LocalDate firstDay = now.with(TemporalAdjusters.firstDayOfMonth()); // 获取当前月的第一天
        LocalDate lastDay = now.with(TemporalAdjusters.lastDayOfMonth()); // 获取当前月的最后一天


		System.out.println("方法二：");
		System.out.println("今天是"+da);
		System.out.println("今年是"+year1+"年"+"\t"+"今天是"+mon1+"月"+"\t"+"今天是"+day1+"号"+"\t"+"这个月有"+lengthOfMonth+"天");
		System.out.println("现在是："+hour1+"："+min1+"："+second1);
	}

}

运行结果：