JAVA编程使用for语句 输入某年份 输出各个月份有多少天

按照你的要求编写的Java程序如下

import java.util.Calendar;

import java.util.Scanner;

public class C{

 public static void main(String[] args) {

  String []week={"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"};

  System.out.print("Enter the year,month and day:");

  Scanner sc=new Scanner(System.in);

  int year=sc.nextInt();

  int month=sc.nextInt();

  int day=sc.nextInt();

  int dayOfMonth=0;

  

  Calendar c=Calendar.getInstance();

  System.out.println("Month\t\tDays");

  for(int i=1;i<=12;i++){

   c.set(Calendar.YEAR, year);

   c.set(Calendar.MONTH, (i-1));

   dayOfMonth=c.getActualMaximum(Calendar.DAY_OF_MONTH);

   System.out.println(i+"\t\t"+dayOfMonth);

  }

  c.clear();

  c.set(Calendar.YEAR,year);

  int dayOfYear=c.getActualMaximum(Calendar.DAY_OF_YEAR);

  System.out.println("There are "+dayOfYear+" days in this year");

  c.clear();

  c.set(year,month-1,day);

  int intWeek=c.get(Calendar.DAY_OF_WEEK)-1;

  System.out.println("The day is a "+week[intWeek]);

 }

}