Java制作简单日历1.用for循环、switch 2.将重复的代码封装调用3.总结

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概述

1.用for循环、switch

以1990.01.01作为参考

public class Demo_9 {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		System.out.print("输入年、月（如：2020 01）：");
		int year = scan.nextInt();
		int month = scan.nextInt();
		int daysum = 0; // 天数加和
		int week = 0; //初始化星期

		//判断闰年，并将每年的天数相加
		for (int i = 1990; i < year; i++) {
			if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
				daysum += 366;
			} else {
				daysum += 365;
			}
		}

		//用循环将最后一年每个月天数相加
		for (int i = 1; i < month; i++) {
			switch (i) {
			case 1:
			case 3:
			case 5:
			case 7:
			case 8:
			case 10:
			case 12:
				daysum += 31;
				break;
			case 2:
				if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
					daysum += 29;
					break;
				} else {
					daysum += 28;
					break;
				}
			default:
				daysum += 30;
			}
		}
		
		//储存所查询的当前月的天数
		int day = 0;
		switch (month) {

		case 1:
		case 3:
		case 5:
		case 7:
		case 8:
		case 10:
		case 12:
			day = 31;
			break;
		case 2:
			if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
				day = 29;
				break;
			} else {
				day = 28;
				break;
			}
		default:
			daysum += 30;
			day = 30;
		}

		week = daysum % 7 + 1; //计算当前月的一号星期几
		
		//制作日历
		System.out.println("一t二t三t四t五t六t日t");
		for (int i = 1; i < day + week; i++) {
			if (i < week) {
				System.out.print("t");
			} else {
				if ((i - 1) % 7 == 0) {
					System.out.println();
				}
				System.out.print((i - week + 1) + "t");
			}
		}
	}
}

2.将重复的代码封装调用

public class Demo {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		System.out.print("请输入 年 月（2000 1）：");
		int year = scan.nextInt();
		int month = scan.nextInt();
		int daysum = dayForMonth(year, month);
		int week = dayForYear(year, month) % 7 + 1;

		if (year < 1990) {
			System.out.println("抱歉！1990年以前暂不支持！！！");
			return;
		}
		if (daysum < 0) {
			System.out.println("输入的月份有误，请重新输入！");
			return;
		}

		System.out.println("tt" + "    " + year + "年" + month + "月");
		System.out.println("一t二t三t四t五t六t日t");
		for (int i = 1; i <= daysum + week - 1; i++) {
			if (i < week) {
				System.out.print("t");
			} else {
				System.out.print(i - (week - 1) + "t");
				if (i % 7 == 0) {
					System.out.println("n");
				}
			}
		}

	}

	// 闰年的判断
	public static boolean isLeapYear(int year) {
		if (year % 400 == 0 || year % 4 == 0 && year % 400 == 0) {
			return true;
		} else {
			return false;
		}
	}

	// 每个月的天数
	public static int dayForMonth(int year, int month) {
		switch (month) {
		case 1:
		case 3:
		case 5:
		case 7:
		case 8:
		case 10:
		case 12:
			return 31;
		case 4:
		case 6:
		case 9:
		case 11:
			return 30;
		case 2:
			if (isLeapYear(year)) {
				return 29;
			} else {
				return 28;
			}
		}
		return -1;
	}

	// 从参考值到所求值的天数
	public static int dayForYear(int year, int month) {
		int day = 0;
		for (int i = 1990; i < year; i++) {
			if (isLeapYear(i)) {
				day += 366;
			} else {
				day += 365;
			}
		}
		for (int i = 0; i < month; i++) {
			day += dayForMonth(year, i);
		}
		return day;
	}
}