Several implementations of converting to 16 in Java

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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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Several implementations of converting to 16 in Java