Byte Array : Byte Array « File Input Output « Java

Byte Array

 * This file is distributed under the GPL
 * $Id: 1619 2008-09-16 16:15:45Z scotta $

//package net.bnubot.util;


 * @author scotta
public final class ByteArray {
  private final byte[] data;

  public ByteArray(byte b) { = new byte[] {b};

  public ByteArray(byte[] data) { = data.clone();

  public ByteArray(String text) {
    byte[] data;
    try {
      data = text.getBytes("UTF-8");
    } catch(UnsupportedEncodingException e) {
      data = text.getBytes();
    } = data;

  public ByteArray(byte[] data, int beginIndex, int endIndex) { = new byte[endIndex - beginIndex];
    System.arraycopy(data, beginIndex,, 0,;

  public final byte[] getBytes() {
    return data;

  public ByteArray concat(byte[] str) {
    byte[] out = new byte[data.length + str.length];
    System.arraycopy(data, 0, out, 0, data.length);
    System.arraycopy(str, 0, out, data.length, str.length);
    return new ByteArray(out);

  public ByteArray concat(ByteArray str) {
    return concat(;

  public ByteArray removeFirst() {
    return substring(1);

  public String toString() {
    try {
      return new String(data, "UTF-8");
    } catch (UnsupportedEncodingException e) {
      return new String(data);

  public int length() {
    return data.length;

  public byte byteAt(int i) {
    return data[i];

  public boolean equals(Object obj) {
    if(obj instanceof byte[]) {
      byte[] x = (byte[])obj;
      if(x.length != data.length)
        return false;
      for(int i = 0; i < x.length; i++) {
        if(x[i] != data[i])
          return false;
      return true;
    if(obj instanceof ByteArray)
      return equals(((ByteArray)obj).data);
    if(obj instanceof String)
      return toString().equals(obj);
    return false;

  public ByteArray substring(int beginIndex) {
    return substring(beginIndex, data.length);

  public ByteArray substring(int beginIndex, int endIndex) {
    return new ByteArray(data, beginIndex, endIndex);
 * This file is distributed under the GPL
 * $Id: 1619 2008-09-16 16:15:45Z scotta $
package net.bnubot.util;

import junit.framework.TestCase;

// * @author scotta
public class ByteArrayTest extends TestCase {

  public void testRemoveFirst() {
    ByteArray ba = new ByteArray("abcdefgh");
    assertEquals("bcdefgh", ba.removeFirst().toString());

  public void testConcat() {
    ByteArray ba1 = new ByteArray("abcd");
    ByteArray ba2 = new ByteArray("efgh");
    assertEquals("abcdefgh", ba1.concat(ba2).toString());

  public void testSubString() {
    ByteArray ba = new ByteArray("abcdefgh");
    assertEquals("bcdefgh", ba.removeFirst().toString());




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