Calendar类方法演示

获取当前的时间,按照自定义的方法来输出


import java.util.Calendar;
public class ClenderDemos 
{/**
 *Calendar 类是一个抽象类,它为特定瞬间与一组诸如YEAR、MONTH、DAY_OF_MONTH、HOUR
 *等日历字段之间的转换提供了一些方法,并为操作日历字段(例如获得下星期的日期)提供了一些方法*/
	public static void main(String[] args)
	{
		//创建一个Calendar实现对象
		Calendar c = Calendar.getInstance();
		method1(c);
	}

	private static void method1(Calendar c) {
		// 
		
		int year = c.get(Calendar.YEAR);
        int month = c.get(Calendar.MONTH) + 1;
        int day = c.get(Calendar.DAY_OF_MONTH);
        int week = c.get(Calendar.DAY_OF_WEEK);

        System.out.println(year + "年\t" + month + "月\t" + day + "日\t" + getWeek(week));
	}

	private static String getWeek(int week) 
	{
		// TODO Auto-generated method stub
		 String[] weeks = { "","星期日" ,"星期一" ,"星期二" ,"星期三" ,"星期四" ,"星期五" ,"星期六" };     
         return weeks[week];
		
	}
}


对其进行一些简单的设置

import java.util.Calendar;
public class ClenderDemos 
{/**
 *Calendar 类是一个抽象类,它为特定瞬间与一组诸如YEAR、MONTH、DAY_OF_MONTH、HOUR
 *等日历字段之间的转换提供了一些方法,并为操作日历字段(例如获得下星期的日期)提供了一些方法*/
	public static void main(String[] args)
	{
		//创建一个Calendar实现对象
		Calendar c = Calendar.getInstance();
		c.set(2015,6,17);
		c.add(Calendar.YEAR,-2);
		method1(c);//2013年	7月	17日	星期三
	}

	private static void method1(Calendar c) {
		// 
		
		int year = c.get(Calendar.YEAR);
        int month = c.get(Calendar.MONTH) + 1;
        int day = c.get(Calendar.DAY_OF_MONTH);
        int week = c.get(Calendar.DAY_OF_WEEK);

        System.out.println(year + "年\t" + month + "月\t" + day + "日\t" + getWeek(week));
	}

	private static String getWeek(int week) 
	{
		// TODO Auto-generated method stub
		 String[] weeks = { "","星期日" ,"星期一" ,"星期二" ,"星期三" ,"星期四" ,"星期五" ,"星期六" };     
         return weeks[week];
		
	}
}

获取每年的二月有多少天


import java.util.Calendar;
public class ClenderDemos 
{/**
 *Calendar 类是一个抽象类,它为特定瞬间与一组诸如YEAR、MONTH、DAY_OF_MONTH、HOUR
 *等日历字段之间的转换提供了一些方法,并为操作日历字段(例如获得下星期的日期)提供了一些方法*/
	public static void main(String[] args)
	{
		//创建一个Calendar实现对象
		Calendar c = Calendar.getInstance();
		int year = 2016;
		method2(c,year);//2016年	2月	29日	星期一
	}

	private static void method2(Calendar c,int year) {
	// TODO Auto-generated method stub
		c.set(year,2,1);
        c.add(Calendar.DAY_OF_MONTH,-1);
        int years = c.get(Calendar.YEAR);
        int month = c.get(Calendar.MONTH) + 1;
        int day = c.get(Calendar.DAY_OF_MONTH);
        int week = c.get(Calendar.DAY_OF_WEEK);

        System.out.println(years + "年\t" + month + "月\t" + day + "日\t" + getWeek(week));
}