[Java] Java byte array and int,long,short,byte conversion

• 
  public class Datatypechangehelper {
• /**
• * Converts a single byte of Byte to a 32-bit int
• *
• * @param b
• * Byte
• * @return Convert result
• */
• public static int Unsignedbytetoint (byte b) {
• return (int) B & 0xFF;
• }
• /**
• * Converts a single byte byte to a number of 16 binary
• *
• * @param b
• * Byte
• * @return Convert result
• */
• public static String Bytetohex (Byte b) {
• int i = b & 0xFF;
• return integer.tohexstring (i);
• }
• /**
• * Convert an array of 4byte to 32-bit int
• *
• * @param buf
• * Bytes Buffer
• * Where to start converting @param byte[]
• * @return Convert result
• */
• public static long Unsigned4bytestoint (byte[] buf, int pos) {
• int firstbyte = 0;
• int secondbyte = 0;
• int thirdbyte = 0;
• int fourthbyte = 0;
• int index = POS;
• Firstbyte = (0X000000FF & ((int) buf[index]));
• Secondbyte = (0X000000FF & ((int) Buf[index + 1]));
• Thirdbyte = (0X000000FF & ((int) Buf[index + 2]));
• Fourthbyte = (0X000000FF & ((int) Buf[index + 3]));
• Index = index + 4;
• Return (long) (Firstbyte << | secondbyte << thirdbyte << 8 | fourthbyte)) & 0xFFFFFFFFL;
• }
• /**
• * Converts a 16-bit short to a byte array
• *
• * @param s
• * Short
• * @return byte[] length is 2
• * */
• public static byte[] Shorttobytearray (short s) {
• Byte[] targets = new BYTE[2];
• for (int i = 0; i < 2; i++) {
• int offset = (Targets.length-1-i) * 8;
• Targets = (byte) ((S >>> offset) & 0xff);
• }
• return targets;
• }
• /**
• * Converts a 32-bit integer to a byte array of length 4
• *
• * @param s
• * INT
• * @return byte[]
• * */
• public static byte[] Inttobytearray (int s) {
• Byte[] targets = new BYTE[2];
• for (int i = 0; i < 4; i++) {
• int offset = (Targets.length-1-i) * 8;
• Targets = (byte) ((S >>> offset) & 0xff);
• }
• return targets;
• }
• /**
• * Long to byte[]
• *
• * @param s
• * Long
• * @return byte[]
• * */
• public static byte[] Longtobytearray (long s) {
• Byte[] targets = new BYTE[2];
• for (int i = 0; i < 8; i++) {
• int offset = (Targets.length-1-i) * 8;
• Targets = (byte) ((S >>> offset) & 0xff);
• }
• return targets;
• }
• /**32 bit int turn byte[]*/
• public static byte[] Int2byte (int res) {
• Byte[] targets = new BYTE[4];
• Targets[0] = (byte) (res & 0xff);//Lowest bit
• TARGETS[1] = (byte) ((res >> 8) & 0xff);//Sub-low
• TARGETS[2] = (byte) ((res >>) & 0xff);//Secondary high
• TARGETS[3] = (byte) (res >>> 24);//highest bit, unsigned right shift.
• return targets;
• }
• /**
• * Converts a byte array of length 2 to 16-bit int
• *
• * @param Res
• * byte[]
• * @return int
• * */
• public static int Byte2int (byte[] res) {
• res = Inversionbyte (res);
• A byte data shifted left 24 bits into 0x?? 000000, then move right 8 bits into 0x00?? 0000
• int targets = (Res[0] & 0xff) | ((Res[1] << 8) & 0xff00); // | Represents an security position or
• return targets;
• }
• }
  

[Java] Java byte array and int,long,short,byte conversion