Convert a Java int to a 4-byte array. - Java java.lang

Java examples for java.lang:byte Array Convert

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Description

Convert a Java int to a 4-byte array.

Demo Code

/* This software was developed by employees of the National Institute of
 * Standards and Technology (NIST), an agency of the Federal Government.
 * Pursuant to title 15 United States Code Section 105, works of NIST
 * employees are not subject to copyright protection in the United States
 * and are considered to be in the public domain.  As a result, a formal
 * license is not needed to use the software.
 * //from w  w w .  j  a va2s.  c om
 * This software is provided by NIST as a service and is expressly
 * provided "AS IS".  NIST MAKES NO WARRANTY OF ANY KIND, EXPRESS, IMPLIED
 * OR STATUTORY, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTY OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT
 * AND DATA ACCURACY.  NIST does not warrant or make any representations
 * regarding the use of the software or the results thereof including, but
 * not limited to, the correctness, accuracy, reliability or usefulness of
 * the software.
 * 
 * Permission to use this software is contingent upon your acceptance
 * of the terms of this agreement.
 */
//package com.java2s;
import java.nio.ByteBuffer;

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

    /** Number of bytes in a Java int. */
    public static final int NUM_BYTES_IN_INT = 4;

    /**
     * Convert a Java int to a 4-byte array.
     * 
     * @param i
     *            A Java int value.
     * @return A 4-byte array representing the int value.
     */
    public static byte[] intToBytes(int i) {

        ByteBuffer byteBuffer = ByteBuffer.allocate(NUM_BYTES_IN_INT);
        byteBuffer.putInt(i);
        return byteBuffer.array();

    }
}

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