java取月的最後一天

㈠ java獲取每個月最後一天的日期

import java.util.Calendar;
import java.util.Date;

public class Test {

public static void main(String args[]) {
System.out.println(getLastDayOfMonth(new Date()));
}
public static Date getLastDayOfMonth(Date sDate1) {
Calendar cDay1 = Calendar.getInstance();
cDay1.setTime(sDate1);
final int lastDay = cDay1.getActualMaximum(Calendar.DAY_OF_MONTH);
Date lastDate = cDay1.getTime();
lastDate.setDate(lastDay);
return lastDate;
}

}

㈡ java中如何獲取某個日期是當月的最後一天

用Calendar就能結決你的問題，代碼如下:
import java.util.Calendar;
import java.util.Date;
public class Data {
public static void main(String[] args) {
Calendar a=Calendar.getInstance();
a.set(Calendar.DATE, 1);//把日期設置為當月第一天
a.roll(Calendar.DATE, -1);//日期回滾一天，也就是最後一天
int MaxDate=a.get(Calendar.DATE);
System.out.println("該月最大天數:"+MaxDate);

}
}
ps:你也可以自己改改把月份設定為自己想要的那個月

㈢ java 怎樣獲取每個月的第一天和最後一天

SimpleDateFormatformat=newSimpleDateFormat("yyyy-MM-dd");
//獲取前月的第一天
Calendarcal_1=Calendar.getInstance();//獲取當前日期
cal_1.add(Calendar.MONTH,-1);
cal_1.set(Calendar.DAY_OF_MONTH,1);//設置為1號,當前日期既為本月第一天
firstDay=format.format(cal_1.getTime());
System.out.println("-----1------firstDay:"+firstDay);

//獲取前月的最後一天
Calendarcale=Calendar.getInstance();
cale.set(Calendar.DAY_OF_MONTH,0);//設置為1號,當前日期既為本月第一天
lastDay=format.format(cale.getTime());
System.out.println("-----2------lastDay:"+lastDay);

//獲取當前月第一天：
Calendarc=Calendar.getInstance();
c.add(Calendar.MONTH,0);
c.set(Calendar.DAY_OF_MONTH,1);//設置為1號,當前日期既為本月第一天
Stringfirst=format.format(c.getTime());
System.out.println("===============first:"+first);

//獲取當前月最後一天
Calendarca=Calendar.getInstance();
ca.set(Calendar.DAY_OF_MONTH,ca.getActualMaximum(Calendar.DAY_OF_MONTH));
Stringlast=format.format(ca.getTime());
System.out.println("===============last:"+last);

㈣ java 知道月份怎麼獲取第一天 最後一天

import java.text.SimpleDateFormat;

import java.util.Calendar;

public class Test {

/**

* 獲取某月的最後一天

* @Title:getLastDayOfMonth

* @Description:

* @param:@param year

* @param:@param month

* @param:@return

* @return:String

* @throws

*/

public static String getLastDayOfMonth(int year,int month) {

Calendar cal = Calendar.getInstance();

//設置年份

cal.set(Calendar.YEAR,year);

//設置月份

cal.set(Calendar.MONTH, month-1);

//獲取某月最大天數

int lastDay = cal.getActualMaximum(Calendar.DAY_OF_MONTH);

//設置日歷中月份的最大天數

cal.set(Calendar.DAY_OF_MONTH, lastDay);

//格式化日期

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

String lastDayOfMonth = sdf.format(cal.getTime());

return lastDayOfMonth;

}

/**

* 獲取這個月的最後一天

* @Title:getLastDayOfCurrentMonth

* @Description:

* @param:@param year

* @param:@param month

* @param:@return

* @return:String

* @throws

*/

public static String getLastDayOfCurrentMonth() {

Calendar cal = Calendar.getInstance();

//獲取某月最大天數

int lastDay = cal.getActualMinimum(Calendar.DAY_OF_MONTH);

//設置日歷中月份的最大天數

cal.set(Calendar.DAY_OF_MONTH, lastDay);

//格式化日期

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

String lastDayOfMonth = sdf.format(cal.getTime());

return lastDayOfMonth;

}

/**

* 獲取某月的第一天

* @Title:getLastDayOfMonth

* @Description:

* @param:@param year

* @param:@param month

* @param:@return

* @return:String

* @throws

*/

public static String getFirstDayOfMonth(int year,int month) {

Calendar cal = Calendar.getInstance();

//設置年份

cal.set(Calendar.YEAR,year);

//設置月份

cal.set(Calendar.MONTH, month-1);

//獲取某月最大天數

int lastDay = cal.getActualMinimum(Calendar.DAY_OF_MONTH);

//設置日歷中月份的最大天數

cal.set(Calendar.DAY_OF_MONTH, lastDay);

//格式化日期

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

String lastDayOfMonth = sdf.format(cal.getTime());

return lastDayOfMonth;

}

/**

* 獲取這個月的第一天

* @Title:getFirstDayOfCurrentMonth

* @Description:

* @param:@param year

* @param:@param month

* @param:@return

* @return:String

* @throws

*/

public static String getFirstDayOfCurrentMonth() {

Calendar cal = Calendar.getInstance();

//獲取某月最大天數

int lastDay = cal.getActualMaximum(Calendar.DAY_OF_MONTH);

//設置日歷中月份的最大天數

cal.set(Calendar.DAY_OF_MONTH, lastDay);

//格式化日期

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

String lastDayOfMonth = sdf.format(cal.getTime());

return lastDayOfMonth;

}

/**

* @Title:main

* @Description:

* @param:@param args

* @return: void

* @throws

*/

public static void main(String[] args)

{

String lastDay = getLastDayOfMonth(2014,2);

System.out.println("獲取2014年2月的最後一天：" + lastDay);

String currentLDay= getLastDayOfCurrentMonth();

System.out.println("獲取本月的最後一天：" + currentLDay);

String firstDay = getFirstDayOfMonth(2014,2);

System.out.println("獲取2014年2月的第一天：" + firstDay);

String currentFDay= getFirstDayOfCurrentMonth();

System.out.println("獲取本月的第一天：" + currentFDay);

}

}

傳上來的代碼真難看，不知道怎麼發文件，我給你截一張圖

㈤ java中如何獲取當前月最後一天

publicStringgetLastMonthDay(){Calendarcal=Calendar.getInstance();Datedate=newDate();cal.setTime(date);intyear=0;intmonth=cal.get(Calendar.MONTH);//上個月月份//intday1=cal.getActualMinimum(Calendar.DAY_OF_MONTH);//起始天數intday=cal.getActualMaximum(Calendar.DAY_OF_MONTH);//結束天數System.out.println("###lastmonth:"+month);if(month==0){year=cal.get(Calendar.YEAR)-1;month=12;}else{year=cal.get(Calendar.YEAR);}StringendDay=year+"-"+month+"-"+day;returnendDay+"23:59:59"}