java取月的最后一天

㈠ java获取每个月最后一天的日期

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中如何获取某个日期是当月的最后一天

用Calendar就能结决你的问题，代码如下:
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);//把日期设置为当月第一天
a.roll(Calendar.DATE, -1);//日期回滚一天，也就是最后一天
int MaxDate=a.get(Calendar.DATE);
System.out.println("该月最大天数:"+MaxDate);

}
}
ps:你也可以自己改改把月份设定为自己想要的那个月

㈢ java 怎样获取每个月的第一天和最后一天

SimpleDateFormatformat=newSimpleDateFormat("yyyy-MM-dd");
//获取前月的第一天
Calendarcal_1=Calendar.getInstance();//获取当前日期
cal_1.add(Calendar.MONTH,-1);
cal_1.set(Calendar.DAY_OF_MONTH,1);//设置为1号,当前日期既为本月第一天
firstDay=format.format(cal_1.getTime());
System.out.println("-----1------firstDay:"+firstDay);

//获取前月的最后一天
Calendarcale=Calendar.getInstance();
cale.set(Calendar.DAY_OF_MONTH,0);//设置为1号,当前日期既为本月第一天
lastDay=format.format(cale.getTime());
System.out.println("-----2------lastDay:"+lastDay);

//获取当前月第一天：
Calendarc=Calendar.getInstance();
c.add(Calendar.MONTH,0);
c.set(Calendar.DAY_OF_MONTH,1);//设置为1号,当前日期既为本月第一天
Stringfirst=format.format(c.getTime());
System.out.println("===============first:"+first);

//获取当前月最后一天
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 知道月份怎么获取第一天 最后一天

import java.text.SimpleDateFormat;

import java.util.Calendar;

public class Test {

/**

* 获取某月的最后一天

* @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();

//设置年份

cal.set(Calendar.YEAR,year);

//设置月份

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

//获取某月最大天数

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

//设置日历中月份的最大天数

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;

}

/**

* 获取这个月的最后一天

* @Title:getLastDayOfCurrentMonth

* @Description:

* @param:@param year

* @param:@param month

* @param:@return

* @return:String

* @throws

*/

public static String getLastDayOfCurrentMonth() {

Calendar cal = Calendar.getInstance();

//获取某月最大天数

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

//设置日历中月份的最大天数

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;

}

/**

* 获取某月的第一天

* @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();

//设置年份

cal.set(Calendar.YEAR,year);

//设置月份

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

//获取某月最大天数

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

//设置日历中月份的最大天数

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;

}

/**

* 获取这个月的第一天

* @Title:getFirstDayOfCurrentMonth

* @Description:

* @param:@param year

* @param:@param month

* @param:@return

* @return:String

* @throws

*/

public static String getFirstDayOfCurrentMonth() {

Calendar cal = Calendar.getInstance();

//获取某月最大天数

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

//设置日历中月份的最大天数

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("获取2014年2月的最后一天：" + lastDay);

String currentLDay= getLastDayOfCurrentMonth();

System.out.println("获取本月的最后一天：" + currentLDay);

String firstDay = getFirstDayOfMonth(2014,2);

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

String currentFDay= getFirstDayOfCurrentMonth();

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

}

}

传上来的代码真难看，不知道怎么发文件，我给你截一张图

㈤ java中如何获取当前月最后一天

publicStringgetLastMonthDay(){Calendarcal=Calendar.getInstance();Datedate=newDate();cal.setTime(date);intyear=0;intmonth=cal.get(Calendar.MONTH);//上个月月份//intday1=cal.getActualMinimum(Calendar.DAY_OF_MONTH);//起始天数intday=cal.getActualMaximum(Calendar.DAY_OF_MONTH);//结束天数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"}