if (target1 == null || target2 == null) {
            return false;
        }
        final int length1 = target1.length();
        final int length2 = target2.length();
        if (length1 < length2) {
            return false;
        }
        final String s1 = target1.substring(length1 - length2);
        return s1.equalsIgnoreCase(target2);
    }

    /**
     * 大文字小文字を無視して特定の文字で始まっているのかどうかを返します。

	r := rand.New(rand.NewSource(UTCNow().UnixNano()))

	buf := &bytes.Buffer{}

	// Verify erasure.Decode() for random offsets and lengths.
	for i := 0; i < iterations; i++ {
		offset := r.Int63n(length)
		readLen := r.Int63n(length - offset)

		expected := data[offset : offset+readLen]

		// Get the checksums of the current part.
		bitrotReaders := make([]io.ReaderAt, len(disks))

            int workstationLength = (workstation != null) ?
                    workstation.length : 0;
            byte[] lmResponse = getLMResponse();
            int lmLength = (lmResponse != null) ? lmResponse.length : 0;
            byte[] ntResponse = getNTResponse();
            int ntLength = (ntResponse != null) ? ntResponse.length : 0;
            byte[] sessionKey = getSessionKey();

      offset = Math.min(offset, this.length);
      length = Math.min(length, this.length - offset);
      int newOffset = this.offset + (int) offset;
      return new ByteArrayByteSource(bytes, newOffset, (int) length);
    }

    @Override
    public String toString() {
      return "ByteSource.wrap("

   */
  public static byte[] concat(byte[]... arrays) {
    int length = 0;
    for (byte[] array : arrays) {
      length += array.length;
    }
    byte[] result = new byte[length];
    int pos = 0;
    for (byte[] array : arrays) {
      System.arraycopy(array, 0, result, pos, array.length);
      pos += array.length;
    }
    return result;
  }

  /**

            return a;
        }
        if (a.length == 0) {
            return b;
        }
        if (b.length == 0) {
            return a;
        }
        final boolean[] array = (boolean[]) Array.newInstance(boolean.class, a.length + b.length);
        System.arraycopy(a, 0, array, 0, a.length);
        System.arraycopy(b, 0, array, a.length, b.length);
        return array;
    }

    /**

   */
  public static float[] concat(float[]... arrays) {
    int length = 0;
    for (float[] array : arrays) {
      length += array.length;
    }
    float[] result = new float[length];
    int pos = 0;
    for (float[] array : arrays) {
      System.arraycopy(array, 0, result, pos, array.length);
      pos += array.length;
    }
    return result;
  }

   */
  public static char[] concat(char[]... arrays) {
    int length = 0;
    for (char[] array : arrays) {
      length += array.length;
    }
    char[] result = new char[length];
    int pos = 0;
    for (char[] array : arrays) {
      System.arraycopy(array, 0, result, pos, array.length);
      pos += array.length;
    }
    return result;
  }

  /**

    @Override
    public InputStream openStream() {
      return new In();
    }

    public void append(byte[] b) {
      byte[] newBytes = Arrays.copyOf(bytes, bytes.length + b.length);
      System.arraycopy(b, 0, newBytes, bytes.length, b.length);
      bytes = newBytes;
    }

    private class In extends InputStream {
      private int pos;

      @Override
      public int read() throws IOException {

   */
  public static double[] concat(double[]... arrays) {
    int length = 0;
    for (double[] array : arrays) {
      length += array.length;
    }
    double[] result = new double[length];
    int pos = 0;
    for (double[] array : arrays) {
      System.arraycopy(array, 0, result, pos, array.length);
      pos += array.length;
    }
    return result;
  }