Java实现进制转换

/**
 * 十进制数字到任意进制的转换
 * 
 * @author youngao
 */
public class HexadecimalConversion {

    static Stack<Integer> s = new Stack<>();

    static Map<Integer, String> map = new HashMap<>();

    public static void main(String[] args) {
        map.put(10, "a");
        map.put(11, "b");
        map.put(12, "c");
        map.put(13, "d");
        map.put(14, "e");
        map.put(15, "f");
        map.put(16, "g");

        clculation(1348, 18);
        StringBuilder stringBuilder = new StringBuilder();
        for (int i = s.size() - 1; i >= 0; i--) {
            Integer integer = s.get(i);
            if (map.containsKey(integer)) {
                stringBuilder.append(map.get(integer));
            } else {
                stringBuilder.append(integer);
            }
        }
        System.err.println(stringBuilder.toString());
    }

    /**
     * 
     * @param num
     *          需要转换的十进制数
     * @param hex
     *          需要被转换的进制
     * @author youngao
     */
    public static void clculation(int num, int hex) {
        if(num <= 0 || hex <= 0) {
            throw new IllegalArgumentException("参数非法");
        }
        int next = num / hex;
        s.push(num % hex);
        if (next == 0) {
            return;
        }
        clculation(next, hex);
    }
}