1968         if (coder() == str.coder()) {

  1968         return StringConcatHelper.simpleConcat(this, str);

  1969             byte[] val = this.value;

  1970             byte[] oval = str.value;

  1971             int len = val.length + oval.length;

  1972             byte[] buf = Arrays.copyOf(val, len);

  1973             System.arraycopy(oval, 0, buf, val.length, oval.length);

  1974             return new String(buf, coder);

  1975         }

  1976         int len = length();

  1977         int olen = str.length();

  1978         byte[] buf = StringUTF16.newBytesFor(len + olen);

  1979         getBytes(buf, 0, UTF16);

  1980         str.getBytes(buf, len, UTF16);

  1981         return new String(buf, UTF16);