Java初學者寫個小日曆

 自學了一些，上了6天Java基礎課，試著自己寫了個小功能，可以根據用戶輸入的年份，來查找當前年份每個月的天數，然後顯示當前年份的日曆，初次發表，求大神們多多關照~~

package saturday;

import java.util.Scanner;

//做個日曆
public class Calendar {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("請輸入一個年份：");
        int year = scanner.nextInt();
        getDays(year);
        getYear(year);
    }
    private static void getDays(int year) {
        int day1 = 31,day2 = 30,day3 = 29,day4 = 28;
//        int year = 2022;
        int[] arr = new int[12];
        for (int i = 0; i < arr.length; i++) {
            switch (i + 1){
                case 4:
                case 6:
                case 9:
                case 11:
                    arr[i] = day2;
                    break;
                case 2:
                    if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) {
                        arr[i] = day3;
                    } else {
                        arr[i] = day4;
                    }
                    break;
                default:
                    arr[i] = day1;
            }
        }
        System.out.println("你輸入的是" + year + "年，每個月的天數為：");
        for (int i = 0; i < arr.length; i++) {
            System.out.print((i+1) + "月有" + arr[i] + "天 " + "t");
            if ((i + 1) % 3 == 0) {
                System.out.println();
            }
        }
    }
    private static void getYear(int year) {
        int[] month = new int[12];
        //一個月31天
        int[] days = new int[31];
        for (int i = 0;i < days.length;i++) {
            days[i] = i + 1;
//            System.out.print(days[i] + " ");
        }
        System.out.println();
        for (int i = 0; i < month.length; i++) {
            month[i] = i + 1;
//            System.out.print(month[i]);
        }
        //根據月份數，查找天數
        
        //month[0] = 1月 ----- 31天
        for (int i = 0; i < month.length; i++) {
            switch (i + 1){
                case 4:
                case 6:
                case 9:
                case 11:
                    System.out.println();
                    System.out.println("ttt" + (i+1) + "月：");
                    for (int j = 0; j < days[days.length - 2]; j++) {
                        System.out.print((j + 1) + " " + "t");
                        if ((j + 1) % 7 == 0) {
                            System.out.println();
                        }
                    }
                    break;
                case 2:
                    System.out.println();
                    System.out.println("ttt" + (i+1) + "月：");
                    if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) {
                        for (int j = 0; j < days[days.length - 3]; j++) {
                            System.out.print((j + 1) + " " + "t");
                            if ((j + 1) % 7 == 0) {
                                System.out.println();
                            }
                        }
                    } else {
                        for (int j = 0; j < days[days.length - 4]; j++) {
                            System.out.print((j + 1) + " " + "t");
                            if ((j + 1) % 7 == 0) {
                                System.out.println();
                            }
                        }
                    }
                    break;
                default:
                    System.out.println();
                    System.out.println("ttt" + (i+1) + "月：");
                    for (int j = 0; j < days[days.length - 1]; j++) {
                        System.out.print((j + 1) + " " + "t");
                        if ((j + 1) % 7 == 0) {
                            System.out.println();
                        }
                    }
            }
        }
    }
}