java的byte array如何擴充或相加

多個byte array 要加起來,很簡的作法

import java.io.ByteArrayOutputStream;
import java.io.IOException;
public class Tester {
   public static void main(String[] args) throws IOException {
      byte[] ArrayA = { 1,2,3};
      byte[] ArrayB = { 4,5,6};
      ByteArrayOutputStream baos = new ByteArrayOutputStream();
      baos.write(ArrayA);
      baos.write(ArrayB);
      byte[] c = baos.toByteArray();
      for(int i=0; i< c.length ; i++) {
         System.out.print(c[i] +" ");
      }
   }
}