用Java实现月历输出

import java.util.*;

	public class Calendar_Month {
	      int week;      //存储某月的第一天是周几
	      int []dayofP = {31,28,31,30,31,30,31,31,30,31,30,31};    //平年每月多少天
	      int []dayofR = {31,29,31,30,31,30,31,31,30,31,30,31};    //闰年每月多少天
	      int dayofM;      //所要求月份的最大天数
	      int year,month;      //用于存储年和月的数值
	      GregorianCalendar objC;     //创建一个日历的实例


	      /**无参数的构造方法，获得当前时间*/
	      public Calendar_Month(){
	          objC = new GregorianCalendar();
	      }
	      
	      //设置该月的第一天是周几,以及设置该月的最大天数
	      void setDay(int[] a){
	          //设置该月的第一天是周几
	          if (a.length == 0){
	              objC.set(Calendar.DAY_OF_MONTH,1);
	              week = objC.get(Calendar.DAY_OF_WEEK);
	              month = objC.get(Calendar.MONTH);
	              year = objC.get(Calendar.YEAR);
	          }
	          else{
	              month = a[1];
	              year = a[0];
	              objC.set(year,month-1,1);
	              week = objC.get(Calendar.DAY_OF_WEEK);
	          }
	         //设置该月的最大天数
	          if(objC.isLeapYear(year)){
	              dayofM = dayofR[month - 1];
	          }
	          else{
	              dayofM = dayofP[month - 1];
	          }
	      }
	      /**此方法用于显示日历*/
	      void display(){
	          System.out.println("\t\t\t     " + year + " 年 " + toDaXie(month) + " 月");
	          System.out.println("\t日\t一\t二\t三\t四\t五\t六");
	          int len = week-1;
	          for(int i = 0; i < week-1; i++){
	              System.out.print("\t ");
	          }
	          for (int i = 1; i <= dayofM; i++) {
	              System.out.print("\t"+i);
	              len++;
	              if(len == 7){
	                  System.out.println();
	                  len=0;
	              }
	          }
	      }
	      public String toDaXie(int n){
	    	  switch (n) {
			case 1:
				return "一";
			case 2:
				return "二";
			case 3:
				return "三";
			case 4:
				return "四";
			case 5:
				return "五";
			case 6:
				return "六";
			case 7:
				return "七";
			case 8:
				return "八";
			case 9:
				return "九";
			case 10:
				return "十";
			case 11:
				return "十一";
			case 12:
				return "十二";
			default:
				return " ";
			}
	      }
	      public static void main(String[] args) {
	          Calendar_Month objCa = new Calendar_Month();
	          Scanner scanner = new Scanner(System.in);
	          int[] a = new int[2];
	          a[0] = scanner.nextInt();
	          a[1] = scanner.nextInt();
	          objCa.setDay(a);
	          objCa.display();
	      }
	}

 输出结果为：

2010 5
			     2010 年 五 月
	日	一	二	三	四	五	六
	 	 	 	 	 	 	1
	2	3	4	5	6	7	8
	9	10	11	12	13	14	15
	16	17	18	19	20	21	22
	23	24	25	26	27	28	29
	30	31

 

 

附从网上找的一个程序：StdOut.print和System.out.println()一样功能，可代替

public class Main {   
    public static int getWeek(int yr, int mo, int day) {   
        int a = (14 - mo) / 12, y = yr - a, m = mo + (12 * a) - 2;   
        return (day + y + y / 4 - y / 100 + y / 400 + (31 * m) / 12) % 7;   
    }   
    public static int getMonth(int y, int m) {   
        if (m == 1 || m == 3 || m == 5 || m == 7 || m == 8  
                || m == 10 || m == 12)   
            return 31;   
        if (m == 4 || m == 6 || m == 9 || m == 11)   
            return 30;   
        if (y % 4 == 0 && y % 100 != 0 || y % 400 == 0)   
            return 29;   
        else  
            return 28;   
    }   
    public static void menology() {   
        int year = StdIn.readInt(), month = StdIn.readInt();   
        String[] showMonth = { "一", "二", "三", "四", "五", "六", "七", "八", "九",   
                "十", "十一", "十二" };   
        StdOut.println("    " + year + "年" + showMonth[month - 1] + "月");   
        StdOut.print("日" + " " + "一" + " " + "二" + " " + "三" + " " + "四" + " "  
                + "五" + " " + "六");   
        System.out.println();   
        int m = getMonth(year, month);   
        for (int i = 0; i < m; i++) {   
            int w = getWeek(year, month, (i + 1));   
            if (i == 0) {   
                for (int j = w; j > 0; j--)   
                    StdOut.print("   ");   
            }   
            if (i < 9)   
                StdOut.print(" " + (i + 1) + " ");   
            else  
                StdOut.print((i + 1) + " ");   
            if ((w == 6) || ((i + 1) == m))   
                StdOut.println();   
        }   
  
    }   
    public static void main(String[] args) {   
        menology();   
    }}