Convert int to byte array - Java java.lang

Java examples for java.lang:byte Array Convert

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Description

Convert int to byte array

Demo Code

/**//from w  w  w.j  a va 2  s .  co  m
 * Syncnapsis Framework - Copyright (c) 2012-2014 ultimate
 * 
 * This program is free software; you can redistribute it and/or modify it under the terms of
 * the GNU General Public License as published by the Free Software Foundation; either version
 * 3 of the License, or 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 MECHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Plublic License along with this program;
 * if not, see <http://www.gnu.org/licenses/>.
 */
//package com.java2s;

public class Main {
    public static void main(String[] argv) throws Exception {
        int data = 2;
        System.out.println(java.util.Arrays.toString(toByteArray(data)));
    }

    /**
     * Convert int to byte array
     * 
     * @param data - the int value
     * @return the byte array
     */
    public static byte[] toByteArray(int data) {
        // @formatter:off
        return new byte[] { (byte) ((data >> 24) & 0xff),
                (byte) ((data >> 16) & 0xff), (byte) ((data >> 8) & 0xff),
                (byte) ((data >> 0) & 0xff) };
        // @formatter:on
    }

    /**
     * Convert long to byte array
     * 
     * @param data - the long value
     * @return the byte array
     */
    public static byte[] toByteArray(long data) {
        // @formatter:off
        return new byte[] { (byte) ((data >> 56) & 0xff),
                (byte) ((data >> 48) & 0xff), (byte) ((data >> 40) & 0xff),
                (byte) ((data >> 32) & 0xff), (byte) ((data >> 24) & 0xff),
                (byte) ((data >> 16) & 0xff), (byte) ((data >> 8) & 0xff),
                (byte) ((data >> 0) & 0xff) };
        // @formatter:on
    }

    /**
     * Convert float to byte array
     * 
     * @param data - the float value
     * @return the byte array
     */
    public static byte[] toByteArray(float data) {
        return toByteArray(Float.floatToRawIntBits(data));
    }

    /**
     * Convert double to byte array
     * 
     * @param data - the double value
     * @return the byte array
     */
    public static byte[] toByteArray(double data) {
        return toByteArray(Double.doubleToRawLongBits(data));
    }

    /**
     * Convert boolean to byte array
     * 
     * @param data - the boolean value
     * @return the byte array
     */
    public static byte[] toByteArray(boolean data) {
        return new byte[] { (byte) (data ? 0x01 : 0x00) };
    }
}

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