获取本周一，本周日，本月头，月尾

电玩女神 2022-08-08 13:45 340阅读 0赞

import java.text.SimpleDateFormat;
    import java.util.Calendar;
    
    public class DateTest {
    	
    	public static void main(String[] args){
    		firstDayOfWeek();
    		lasyDayOfWeek();
    		nextMondayOfWeek();
    		firstdayOfMonth();
    		lastdayOfMonth();
    	}
    	
    	/**
    	 * 周一
    	 */
    	public static void firstDayOfWeek(){
    		SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
    		Calendar cal = Calendar.getInstance();
    		cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY); //获取本周一的日期
    		System.out.println(simpleDateFormat.format(cal.getTime()));
    	}
    	
    	/**
    	 * 周日
    	 */
    	public static void lasyDayOfWeek(){
    		SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
    		Calendar cal = Calendar.getInstance();
    		cal.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
    		cal.add(Calendar.WEEK_OF_YEAR, 1);
    		System.out.println(simpleDateFormat.format(cal.getTime()));
    	}
    	
    	/**
    	 * 下个星期一
    	 */
    	public static void nextMondayOfWeek(){
    		SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
    		Calendar cal = Calendar.getInstance();
    		cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
    		cal.add(Calendar.WEEK_OF_YEAR, 1);
    		System.out.println(simpleDateFormat.format(cal.getTime()));
    	}
    	
    	/**
    	 * 月头
    	 */
    	public static void firstdayOfMonth(){
    		SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
    		Calendar cal = Calendar.getInstance();
    		cal.set(Calendar.DATE, cal.getActualMinimum(Calendar.DATE)); 
    		System.out.println(simpleDateFormat.format(cal.getTime()));
    	}
    	
    	/**
    	 * 月尾
    	 */
    	public static void lastdayOfMonth(){
    		SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
    		Calendar cal = Calendar.getInstance();
    		cal.set(Calendar.DATE, cal.getActualMaximum(Calendar.DATE)); 
    		System.out.println(simpleDateFormat.format(cal.getTime()));
    	}
    	
    }