Java Byte Array Create toByteArray(int value)

Description

Convert an integer to a byte[] array.

License

Open Source License

Parameter

Parameter	Description
value	The input integer.

Return

The array of bytes representing the integer.

Declaration

public static byte[] toByteArray(int value) 

Method Source Code

//package com.java2s;
/*/*w  ww . j av  a2  s  . c o  m*/
This file is part of PH-Tree:
A multi-dimensional indexing and storage structure.
    
Copyright (C) 2011-2015
Eidgen?ssische Technische Hochschule Z?rich (ETH Zurich)
Institute for Information Systems
GlobIS Group
Bogdan Vancea, Tilmann Zaeschke
zaeschke@inf.ethz.ch or zoodb@gmx.de
    
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
    
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Affero General Public License for more details.
    
You should have received a copy of the GNU Affero General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

public class Main {
    /**
     * Convert an integer to a byte[] array. The byte[] array is composed of the
     * bytes backing the integer, in big ending notation.
     *
     * @param value                 The input integer.
     * @return                      The array of bytes representing the integer.
     */
    public static byte[] toByteArray(int value) {
        int intByteSize = 4;
        byte[] byteArray = new byte[intByteSize];
        for (int i = 0; i < intByteSize; i++) {
            byteArray[i] = (byte) ((value) >>> ((intByteSize - 1 - i) * 8));
        }

        return byteArray;
    }

    /**
     * Convert an array of longs to an array of bytes. Each long is split into
     * 8 bytes and the list of all composing bytes is returned. To ordering is preserved.
     *
     * @param longArray             The input array of longs
     * @return                      An array of bytes.
     */
    public static byte[] toByteArray(long[] longArray) {
        int longByteSize = 8;
        byte[] byteArray = new byte[longArray.length * longByteSize];
        for (int i = 0; i < longArray.length; i++) {
            for (int j = 0; j < longByteSize; j++) {
                //to obtain each byte, shift the long from which it is take to the right
                //and truncate all leading bits by down-casting to byte.
                byteArray[i * longByteSize + j] = (byte) (longArray[i] >>> ((7 - j) * 8));
            }
        }
        return byteArray;
    }
}

Related

1. toByteArray(int i)
2. toByteArray(int in)
3. toByteArray(int in, int size)
4. toByteArray(int intr)
5. toByteArray(int num)
6. toByteArray(int value)
7. toByteArray(int value)
8. toByteArray(int value)
9. toByteArray(int value)