天干地支算法

/**
* http://en.wikipedia.org/wiki/Sexagenary_cycle
*/
public class Sexagenary {
/**
* 输入干支，输出对应数值。
*/
public static int getValue(Stems stems, Branches branches) {
int s = stems.ordinal() + 1;
int b = branches.ordinal() + 1;

int value = (6 * s - 5 * b + 60) % 60;
return value;
}

/**
* 输入数值，输出对应干支(String)
*/
public static String getStemsBranches(int num) {
if (num < 1 || num > 60) {
throw new IllegalArgumentException("Error input, num:" + num);
}

int s = ((num % 10) == 0) ? 10 : (num % 10);
int b = ((num % 12) == 0) ? 12 : (num % 12);

Stems stems = Stems.values()[s - 1];
Branches branches = Branches.values()[b - 1];

return "" + stems + branches;
}


public static void main(String[] args) {
System.out.println(Stems.甲);
System.out.println(Sexagenary.getStemsBranches(1)); // 甲子
System.out.println(Sexagenary.getStemsBranches(53)); // 丙辰
System.out.println("" + Sexagenary.getValue(Stems.甲, Branches.子)); // 1
System.out.println("" + Sexagenary.getValue(Stems.丙, Branches.辰)); // 53
System.out.println("" + Sexagenary.getValue(Stems.戊, Branches.午)); // 55
}
}

enum Stems {
甲, 乙, 丙, 丁, 戊, 己, 庚, 辛, 壬, 癸;
}

enum Branches {
子, 丑, 寅, 卯, 辰, 巳, 午, 未, 申, 酉, 戌, 亥;
}