JAVA判断当前日期是星期几

方法1：

   /**
    * 判断当前日期是星期几<br>
    * <br>
    * @param pTime 修要判断的时间<br>
    * @return dayForWeek 判断结果<br>
    * @Exception 发生异常<br>
    */
public  static  int  dayForWeek(String pTime) throws  Exception {
 format = new  SimpleDateFormat("yyyy-MM-dd" );
 Calendar c = Calendar.getInstance();
 c.setTime(format.parse(pTime));
 int  dayForWeek = 0 ;
 if (c.get(Calendar.DAY_OF_WEEK) == 1 ){
  dayForWeek = 7 ;
 }else {
  dayForWeek = c.get(Calendar.DAY_OF_WEEK) - 1 ;
 }
 return  dayForWeek;
}

 

方法2：

需要导入的包

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

public  static  int  dayForWeek(String pTime) throws  Throwable {

    SimpleDateFormat format = new  SimpleDateFormat("yyyy-MM-dd" );

    Date tmpDate = format.parse(pTime);

    Calendar cal = new  GregorianCalendar();

    cal.set(tmpDate.getYear(), tmpDate.getMonth(), tmpDate.getDay());

    return  cal.get(Calendar.DAY_OF_WEEK);
}

/**
     * 获取当前日期是星期几<br>
     *
     * @param dt
     * @return 当前日期是星期几
     */
    public static String getWeekOfDate(Date dt) {
        String[] weekDays = {"星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"};
        Calendar cal = Calendar.getInstance();
        cal.setTime(dt);

        int w = cal.get(Calendar.DAY_OF_WEEK) - 1;
        if (w < 0)
            w = 0;

        return weekDays[w];
    }

/**
* 获取当前日期是星期几
*
* @param dt
* @return 当前日期是星期几
*/
public static String getWeekOfDate(Date dt) {
String[] weekDays = {"星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"};
Calendar cal = Calendar.getInstance();
cal.setTime(dt);

int w = cal.get(Calendar.DAY_OF_WEEK) - 1;
if (w < 0)
w = 0;

return weekDays[w];
}

Date date=new Date();
//今天是几号
int day=date.getDate();
System.out.println("Today is :"+day+"号");
Calendar c=Calendar.getInstance();
c.setTime(date);
//今天是这个星期的第几天
int week=c.get(Calendar.DAY_OF_WEEK);
System.out.println("week:"+c.get(Calendar.DAY_OF_WEEK));
//当前月的最后一天是几号
int lastday=c.getActualMaximum(Calendar.DAY_OF_MONTH);
System.out.println("这个月最后一天是:"+lastday+"号");