Java中轉換為十六進位的幾種實現

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public class HexUtil {    private static final String[] DIGITS_UPPER =            {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F"};    public static void main(String[] args) throws DecoderException {        System.out.println(toHex1((byte) -128));        System.out.println(toHex2((byte) -128));        System.out.println(toHex3((byte) -128));        System.out.println(toHex4((byte) -128));    }    public static String toHex1(byte value) {        int high = (value & 0xF0) >>> 4;        int low = value & 0x0F;        return DIGITS_UPPER[high] + DIGITS_UPPER[low];    }    public static String toHex2(byte value) {        int high = (value >>> 4) & 0x0F;        int low = value & 0x0F;        return DIGITS_UPPER[high] + DIGITS_UPPER[low];    }    public static String toHex3(byte value) {        int tmp = value;        if (value < 0) {            tmp = value + 256;        }        int high = tmp / 16;        int low = tmp % 16;        return DIGITS_UPPER[high] + DIGITS_UPPER[low];    }    public static String toHex4(byte value) {        return String.format("%x", value);    }}

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Java中轉換為十六進位的幾種實現