将整数转换为长度为4的字节数组。

//package com.nowjava;
// 来 自 时 代      J a v a   公   众 号 - nowjava.com

public class Main {

    public static void main(String[] argv) throws Exception {

        int a = 2;

        byte[] buf = new byte[] { 34, 35, 36, 37, 37, 37, 67, 68, 69 };

        integerToByteArray(a, buf);

    }


    /**

     * Converts an integer to a byte array with a length of 4.

     * @param a - The integer to convert.

     * @param buf - The byte array to store the integer in. This must be a length of at least 4.

     */

    public static void integerToByteArray(int a, byte[] buf) {

        buf[0] = (byte) ((a >> 24) & 0xFF);

        buf[1] = (byte) ((a &