Convert an UNSIGNED byte to a JAVA typeTag(s): String/Number
In JAVA, a byte always considered as signed when converted to another type. We must mask the sign bit to JAVA, cast to an integer and process the masked bit if needed. The following method implements this idea :
public class UnsignedByte { public static void main (String args[]) { byte b1 = 127; byte b2 = -128; byte b3 = -1; System.out.println(b1); System.out.println(b2); System.out.println(b3); System.out.println(unsignedByteToInt(b1)); System.out.println(unsignedByteToInt(b2)); System.out.println(unsignedByteToInt(b3)); /* 127 -128 -1 127 128 255 */ } public static int unsignedByteToInt(byte b) { return (int) b & 0xFF; } }
int i = 0; int pos = 0; i += unsignedByteToInt(buf[pos++]) << 24; i += unsignedByteToInt(buf[pos++]) << 16; i += unsignedByteToInt(buf[pos++]) << 8; i += unsignedByteToInt(buf[pos++]) << 0;
public static String byteToHex(byte b){ int i = b & 0xFF; return Integer.toHexString(i); }