天干地支纪年法 Tiangan dizhi chronology
`天干地支，简称为干支，源自中国远古时代对天象的观测。十干是指阏逢、旃蒙、柔兆、强圉、著雍、屠维、上章、重光、玄黓、昭阳。十二支是指困敦、赤奋若、摄提格、单阏、执徐、大荒落、敦牂、协洽、涒滩、作噩、阉茂、大渊献。 [1]

简化后的天干地支：“甲、乙、丙、丁、戊、己、庚、辛、壬、癸”称为十天干，“子、丑、寅、卯、辰、巳、午、未、申、酉、戌、亥”称为十二地支。
十天干和十二地支依次相配，组成六十个基本单位，两者按固定的顺序相互配合，组成了干支纪元法。天干地支的发明影响深远，依旧在使用天干地支，用于历法、术数、计算、命名等各方面。 [1]
中文`

练习使用Java将公元纪年转化为天干地支纪年法

import java.util.Scanner;
public class Test {
public static void main(String[] args)
{
    System.out.println("Enter Years,Sir.");
    Scanner scanner=new Scanner(System.in);
    int years = scanner.nextInt();
    if (years >= 3) {
        System.out.println("Successe");
        int one = years - 3;
        int sky = one % 10;
        int land = one % 12;
        switch (sky) {
            case 1:
                System.out.println("甲");
                break;
            case 2:
                System.out.println("乙");
                break;
            case 3:
                System.out.println("丙");
                break;
            case 4:
                System.out.println("丁");
                break;
            case 5:
                System.out.println("戊");
                break;
            case 6:
                System.out.println("己");
                break;
            case 7:
                System.out.println("庚");
                break;
            case 8:
                System.out.println("辛");
                break;
            case 9:
                System.out.println("壬");
                break;
            case 10:
                System.out.println("癸");
                break;
            default:
                System.out.println("Error2");
                break;
        }
        switch (land) {
            case 1:
                System.out.println("子");
                break;
            case 2:
                System.out.println("丑");
                break;
            case 3:
                System.out.println("寅");
                break;
            case 4:
                System.out.println("卯");
                break;
            case 5:
                System.out.println("辰");
                break;
            case 6:
                System.out.println("巳");
                break;
            case 7:
                System.out.println("午");
                break;
            case 8:
                System.out.println("未");
                break;
            case 9:
                System.out.println("申");
                break;
            case 10:
                System.out.println("酉");
                break;
            case 11:
                System.out.println("戌");
                break;
            case 0:
                System.out.println("亥");
                break;
            default:
                System.out.println("Error3");
                break;
        }
    }
    else
    {
        System.out.println("Error0");
    }
}

}

使用IDEA修改后的代码

import java.util.Scanner;
public class Test {
public static void main(String[] args)
{
    System.out.println("Enter Years,Sir.");
    Scanner scanner=new Scanner(System.in);
    int years = scanner.nextInt();
    if (years >= 3) {
        System.out.println("Enter Successes");
        int one = years - 3;
        int sky = one % 10;
        int land = one % 12;
        switch (sky) {
            case 1 -> System.out.println("甲");
            case 2 -> System.out.println("乙");
            case 3 -> System.out.println("丙");
            case 4 -> System.out.println("丁");
            case 5 -> System.out.println("戊");
            case 6 -> System.out.println("己");
            case 7 -> System.out.println("庚");
            case 8 -> System.out.println("辛");
            case 9 -> System.out.println("壬");
            case 0 -> System.out.println("癸");
            default -> System.out.println("Error2");
        }
        switch (land) {
            case 1 -> System.out.println("子");
            case 2 -> System.out.println("丑");
            case 3 -> System.out.println("寅");
            case 4 -> System.out.println("卯");
            case 5 -> System.out.println("辰");
            case 6 -> System.out.println("巳");
            case 7 -> System.out.println("午");
            case 8 -> System.out.println("未");
            case 9 -> System.out.println("申");
            case 10 -> System.out.println("酉");
            case 11 -> System.out.println("戌");
            case 0 -> System.out.println("亥");
            default -> System.out.println("Error3");
        }
    }
    else
    {
        System.out.println("Error0");
    }
}

}