蓝桥杯算法提高VIP-任意年月日历输出-题解（Java代码）

import java.util.Calendar;

import java.util.Scanner;

public class Main {

static String[] dayss = { " 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" }; // 存格式化后的号数

static String[][] ri = new String[5][7]; // 存日历主体部分

public static void main(String[] args) {

// TODO Auto-generated method stub

Scanner sc = new Scanner(System.in);

int year = sc.nextInt();

int month = sc.nextInt()-1;

int[] day = { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }; // 每月的天数，

Calendar sa = Calendar.getInstance();

sa.set(year, month, 1); // 设置年月日

int dd = sa.get(sa.DAY_OF_WEEK); // 得到星期对应的数字

// System.out.println(dd);

if (year % 4 == 0 && year % 100 == 0) { // 判断闰年

day[1] = 28; //闰年2月有28天

int days = day[month];

print(days, dd);

} else {

int days = day[month];

print(days, dd);

}

}

private static void print(int days, int dd) {

int index = 0;

int b = 0;

for (int i = 0; i < ri.length; i++) {

for (int j = (b++ == 0? dd-1:0); j < ri[i].length; j++) {

if(index < days)

ri[i][j] = dayss[index++];

}

}

System.out.println("---------------------");

System.out.println(" Su Mo Tu We Th Fr Sa");

System.out.println("---------------------");

for (int i = 0; i < ri.length; i++) {

for (int j = 0; j < ri[i].length; j++) {

if(ri[i][j] == null) ri[i][j] = "  "; // 处理null值

System.out.print(" "+ ri[i][j]);

}

System.out.println();

}

System.out.println("---------------------");

}

}