java 求出当月天数和有几个星期天

public static void main(String[] args) {

//SimpleDateFormat sf=new SimpleDateFormat("yyyy-MM-dd");

try {

Systemoutprintln("当前月共多少天 : " + DateUtilsgetDaysOfTheMonth(new Date()));

Systemoutprintln("当前月星期天天数:"+DateUtilsgetSundays(new Date()));

} catch (Exception e) {

// TODO Auto-generated catch block

eprintStackTrace();

}

}

public static int getDaysOfTheMonth(Date date){//获取当月天数

Calendar rightNow = CalendargetInstance();

rightNowsetTime(date); // 要计算你想要的月份，改变这里即可

int days = rightNowgetActualMaximum(CalendarDAY_OF_MONTH);

return days;

}

// 返回当月星期天数

public static int getSundays(Date dat) {

int sundays = 0;

SimpleDateFormat sdf = new SimpleDateFormat("EEEE");

Calendar setDate = CalendargetInstance();

// 从第一天开始

int day;

for (day = 1; day <= getDaysOfTheMonth(dat); day++) {

setDateset(CalendarDATE, day);

String str = sdfformat(setDategetTime());

//Systemoutprintln("str:"+str);

if (strequals("星期日")) {

sundays++;

}

}

return sundays;

}

import javaio;

import javautilScanner;

class DayTest

{

public static void main(String []args)throws IOException

{

int year = -1;

int month = -1;

Scanner in = new Scanner(Systemin);

Systemoutprintln("请输入年");

year = innextInt();

Systemoutprintln("请输入月");

month = innextInt();

Systemoutprintln(year+"年"+month+"月有"+days(year,month)+"天");

}

public static int days(int year,int month)

{

int days = 0;

if(month!=2)

{

switch(month)

{

case 1:

case 3:

case 5:

case 7:

case 8:

case 10:

case 12:days = 31 ;break;

case 4:

case 6:

case 9:

case 11:days = 30;

}

}

else

{

if(year%4==0 && year%100!=0 || year%400==0)

days = 29;

else days = 28;

}

return days;

}

}

我做过测试了完全正确分给我吧嘻嘻!

import javautilDate;

import javatextSimpleDateFormat;

public class daysofmonth

{

public daysofmonth(){}//构造方法

public static void calculate(int m,int y)//知月份年份求月份天数的方法caluculate

{

if(m==1||m==3||m==5||m==7||m==8||m==10||m==12)

Systemoutprintln(y+"年"+m+"月："+"31天");

else if(m!=2)

Systemoutprintln(y+"年"+m+"月："+"30天");

else if((y%4==0&&y%100!=0)||(y%400==0))

Systemoutprintln(y+"年"+m+"月："+"29天");

else

Systemoutprintln(y+"年"+m+"月："+"28天");

}

public static void main(String args[])

{

Date nowTime=new Date();//获取当前时间

SimpleDateFormat yearPattern=new SimpleDateFormat("yyyy");//获取字符串型年份的对象

SimpleDateFormat monthPattern=new SimpleDateFormat("MM");//获取字符串型月份的对象

int inty=IntegerparseInt(yearPatternformat(nowTime));//将当前年份转化为整型

int intm=IntegerparseInt(monthPatternformat(nowTime));//将当前月份转化为整型

int a[]=new int[7];//定义一个整型数组

a[0]=intm;

Systemoutprintln("当月之后半年内每月的天数：");

for(int i=1;i<7;i++)

{

if(a[i-1]==12)

{

a[i]=1;

inty=inty+1;

calculate(a[i],inty);

}

else

{

a[i]=a[i-1]+1;

calculate(a[i],inty);

}

}

}

}

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