Java Utililty Methods Integer to Byte Array

List of utility methods to do Integer to Byte Array

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Description

The list of methods to do Integer to Byte Array are organized into topic(s).

Method

byte[]intToByteArray(int value, int nrOfBytes)
Converts the given int value to an array of byte of given length. 
byte[] result = new byte[nrOfBytes];
for (int i = 0; i < nrOfBytes && i < 4; i++) {
    result[nrOfBytes - 1 - i] = (byte) (value >>> (i * 8));
return result;
byte[]intToByteArray(int value, int numBytes)
int To Byte Array 
if (numBytes < 1 || numBytes > 4)
    throw new RuntimeException("Bad");
byte[] actualByteArray = new byte[] { (byte) (value >>> 24), (byte) (value >>> 16), (byte) (value >>> 8),
        (byte) value };
byte[] out = new byte[numBytes];
System.arraycopy(actualByteArray, 4 - numBytes, out, 0, numBytes);
return out;
byte[]intToByteArray2(final int integer)
int To Byte Array 
int byteNum = (40 - Integer.numberOfLeadingZeros(integer < 0 ? ~integer : integer)) / 8;
byte[] byteArray = new byte[4];
for (int n = 0; n < byteNum; n++)
    byteArray[3 - n] = (byte) (integer >>> (n * 8));
return new byte[] { byteArray[2], byteArray[3] };
byte[]intToByteArray4(int i)
Converts an integer number into a 4 bytes array 
return new byte[] { (byte) ((i >> 24) & 0xff), (byte) ((i >> 16) & 0xff), (byte) ((i >> 8) & 0xff),
        (byte) (i & 0xff) };
byte[]intToByteArray4(int value)
Returns a byte array with length = 4 
return new byte[] { (byte) (value >>> 24), (byte) (value >>> 16), (byte) (value >>> 8), (byte) value };
byte[]intToByteArrayBE(int data)
Convert an integer to a byte array (big endian). 
return new byte[] { (byte) ((data >> 24) & 0xff), (byte) ((data >> 16) & 0xff), (byte) ((data >> 8) & 0xff),
        (byte) ((data >> 0) & 0xff), };
byte[]intToByteArrayLE(int v)
Convert an integer to byte array using Little Endian representation 
return new byte[] { (byte) ((v & 0x000000FF)), (byte) ((v & 0x0000FF00) >> 8),
        (byte) ((v & 0x00FF0000) >> 16), (byte) ((v & 0xFF000000) >> 24) };
byte[]intToByteLittleEnding(int j)
int To Byte Little Ending 
final byte[] bytes = new byte[4];
bytes[0] = (byte) (j & 0xff);
bytes[1] = (byte) ((j >>> 8) & 0xff);
bytes[2] = (byte) ((j >>> 16) & 0xff);
bytes[3] = (byte) ((j >>> 24) & 0xff);
return bytes;
byte[]intToByteMSB(int in)
int To Byte MSB 
byte[] ou = new byte[4];
ou[0] = (byte) ((in >> 24) & 0xff);
ou[1] = (byte) ((in >> 16) & 0xff);
ou[2] = (byte) ((in >> 8) & 0xff);
ou[3] = (byte) (in & 0xff);
return ou;
intintToBytes(byte[] arr, int offset, int num)
int To Bytes 
arr[offset + 0] = (byte) (num >> 24);
arr[offset + 1] = (byte) (num >> 16);
arr[offset + 2] = (byte) (num >> 8);
arr[offset + 3] = (byte) (num >> 0);
return INT_SIZE;