Java - Convert int to Byte Array of 4 Bytes

Question

Possible Duplicate    Convert integer into byte array  Java        I need to store the length of a buffer  in a byte array 4 bytes large   Pseudo code   private byte   convertLengthToByte byte   myBuffer        int length   myBuffer length       byte   byteLength   new byte 4          here is where I need to convert the int length to a byte array     byteLength   length toByteArray       return byteLength      What would be the best way of accomplishing this  Keeping in mind I must convert that byte array back to an integer later

User · Accepted Answer

You can convert yourInt to bytes by using a ByteBuffer like this   return ByteBuffer allocate 4  putInt yourInt  array      Beware that you might have to think about the byte order when doing so

User · Answer

public static  byte   my int to bb le int myInteger       return ByteBuffer allocate 4  order ByteOrder LITTLE ENDIAN  putInt myInteger  array       public static int my bb to int le byte    byteBarray       return ByteBuffer wrap byteBarray  order ByteOrder LITTLE ENDIAN  getInt       public static  byte   my int to bb be int myInteger       return ByteBuffer allocate 4  order ByteOrder BIG ENDIAN  putInt myInteger  array       public static int my bb to int be byte    byteBarray       return ByteBuffer wrap byteBarray  order ByteOrder BIG ENDIAN  getInt

User · Answer

int integer   60  byte   bytes   new byte 4   for  int i   0  i  lt  4  i          bytes i     byte  integer  gt  gt  gt   i   8

User · Answer

This should work   public static final byte   intToByteArray int value        return new byte                  byte  value  gt  gt  gt  24                byte  value  gt  gt  gt  16                byte  value  gt  gt  gt  8                byte value       Code taken from here   Edit An even simpler solution is given in this thread

[java] Java - Convert int to Byte Array of 4 Bytes?

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