int分解为byte Java利用移位运算将int型分解成四个byte型的方法

package 移位运算;
public class 移位运算 {
 public static void main(String[] args) {
 //00000111 01011011 11001101 00010101
 int n=123456789; //n为需要进行移位处理的32位int型初始值
 byte[] a =chai(n);
 for (int i = 0; i < a.length; i++) {
 byte b=a[i];
 System.out.print(b+" ");
 }
 //将数组重新合并成一个int型
 System.out.println(hebing(a));
 }
 private static int hebing(byte[] arr) {
 int n=0;
 /*for (int i = 0; i < arr.length; i++) { //循环位或
 n=n|arr[i]<<8*(arr.length-1)>>>8*i;
 }
 *
 * n=n|arr[0]<<24;
 * n=n|arr[1]<<24>>>8;
 * n=n|arr[2]<<24>>>16;
 * n=n|arr[3]<<24>>>24;
 */
 for (int i = 0; i < arr.length; i++) { //循环位或
 n+=(arr[i]&0x000000ff)<<8*(arr.length-1-i);
 }
 return n;
 }
 private static byte[] chai(int n) {
 // 新建四个长度的byte数组
 byte[] arr = new byte[4];
 for (int i = 0; i < arr.length; i++) {
 arr[i] = (byte) (n>>8*(arr.length-i-1));
 }
 return arr;
 }
}