Java Integer to Byte Array intToByteArray(final int x)

Description

Convert an integer to a byte array.

License

Open Source License

Parameter

Parameter	Description
x	The integer

Return

The byte array (length = 4)

Declaration

public static byte[] intToByteArray(final int x) 

Method Source Code

//package com.java2s;
/**/*  ww  w  . j a v a  2s . co m*/
 * Copyright (c) 2009-2011 National University of Ireland, Galway. All Rights Reserved.
 *
 * Project and contact information: http://www.siren.sindice.com/
 *
 * This file is part of the SIREn project.
 *
 * SIREn is a 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.
 *
 * SIREn 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 SIREn. If not, see <http://www.gnu.org/licenses/>.
 */

public class Main {
    /**
     * Convert an integer to a byte array.
     *
     * @param x The integer
     * @return The byte array (length = 4)
     */
    public static byte[] intToByteArray(final int x) {
        final byte[] bytes = new byte[4];
        bytes[3] = (byte) (x & 0x000000ff);
        bytes[2] = (byte) ((x & 0x0000ff00) >>> 8);
        bytes[1] = (byte) ((x & 0x00ff0000) >>> 16);
        bytes[0] = (byte) ((x & 0xff000000) >>> 24);
        return bytes;
    }

    /**
     * Convert an integer to a byte array.
     *
     * @param x The integer
     * @param bytes The byte array (length = 4)
     */
    public static final void intToByteArray(final int x, final byte[] bytes) {
        bytes[3] = (byte) (x & 0x000000ff);
        bytes[2] = (byte) ((x & 0x0000ff00) >>> 8);
        bytes[1] = (byte) ((x & 0x00ff0000) >>> 16);
        bytes[0] = (byte) ((x & 0xff000000) >>> 24);
    }

    /**
     * Convert an integer to a byte array. Copy 'length' integer bytes.
     *
     * @param x The integer
     * @param bytes The byte array
     * @param length The number of bytes to copy into the byte array
     */
    public static final void intToByteArray(final int x, final byte[] bytes, final int length) {
        switch (length) {
        case 1:
            bytes[0] = (byte) (x & 0x000000ff);
            return;

        case 2:
            bytes[1] = (byte) (x & 0x000000ff);
            bytes[0] = (byte) ((x & 0x0000ff00) >>> 8);
            return;

        case 3:
            bytes[2] = (byte) (x & 0x000000ff);
            bytes[1] = (byte) ((x & 0x0000ff00) >>> 8);
            bytes[0] = (byte) ((x & 0x00ff0000) >>> 16);
            return;

        case 4:
            bytes[3] = (byte) (x & 0x000000ff);
            bytes[2] = (byte) ((x & 0x0000ff00) >>> 8);
            bytes[1] = (byte) ((x & 0x00ff0000) >>> 16);
            bytes[0] = (byte) ((x & 0xff000000) >>> 24);

        default:
            break;
        }
    }
}

Related

1. intToByteArray(final int integer)
2. intToByteArray(final int integer)
3. intToByteArray(final int v, final byte[] buf, final int offset)
4. intToByteArray(final int val, final byte[] buf, final int offset)
5. intToByteArray(final int value)
6. intToByteArray(final int x, final byte[] dst, final int offset)
7. intToByteArray(int a)
8. intToByteArray(int a)
9. intToByteArray(int bytes)