How to use

substring

method

in

java.lang.StringBuilder

  protected String getResult() {
    return result.length() != 0 ? result.substring(1) : "";
  }
}

private void removeFirstEmptyLine() {
  int len = NL.length();
  if (buf.substring(0, len).equals(NL)) {
    buf.delete(0, len);
  }
}

/**
 * @param addr byte array of a MAC address.
 * @return hex formatted MAC address.
 */
public static String formatAddress(byte[] addr) {
  StringBuilder buf = new StringBuilder(24);
  for (byte b: addr) {
    buf.append(String.format("%02x:", b & 0xff));
  }
  return buf.substring(0, buf.length() - 1);
}

/**
 * Creates a new ephemeral port based on the ID of the specified channel.
 * Note that we prepend an upper-case character so that it never conflicts with
 * the addresses created by a user, which are always lower-cased on construction time.
 */
LocalAddress(Channel channel) {
  StringBuilder buf = new StringBuilder(16);
  buf.append("local:E");
  buf.append(Long.toHexString(channel.hashCode() & 0xFFFFFFFFL | 0x100000000L));
  buf.setCharAt(7, ':');
  id = buf.substring(6);
  strVal = buf.toString();
}

/**
 * @param addr byte array of a MAC address.
 * @return hex formatted MAC address.
 */
public static String formatAddress(byte[] addr) {
  StringBuilder buf = new StringBuilder(24);
  for (byte b: addr) {
    buf.append(String.format("%02x:", b & 0xff));
  }
  return buf.substring(0, buf.length() - 1);
}

private boolean regionMatch(final StringBuilder string, final int index, final String test) {
  boolean matches = false;
  if( index >= 0 &&
    index + test.length() - 1 < string.length() ) {
    final String substring = string.substring( index, index + test.length());
    matches = substring.equals( test );
  }
  return matches;
}

private CodeBlock generateSeeMethodJavadocInternal(
  TypeName nameOfClassContainingMethod, String methodName,
  List<Object> safeParameterNames) {
 StringBuilder javadocString = new StringBuilder("@see $T#$L(");
 List<Object> javadocArgs = new ArrayList<>();
 javadocArgs.add(nameOfClassContainingMethod);
 javadocArgs.add(methodName);
 for (Object param : safeParameterNames) {
  javadocString.append("$T, ");
  javadocArgs.add(param);
 }
 if (javadocArgs.size() > 2) {
  javadocString = new StringBuilder(javadocString.substring(0, javadocString.length() - 2));
 }
 javadocString.append(")\n");
 return CodeBlock.of(javadocString.toString(), javadocArgs.toArray(new Object[0]));
}

/**
 * Creates a new ephemeral port based on the ID of the specified channel.
 * Note that we prepend an upper-case character so that it never conflicts with
 * the addresses created by a user, which are always lower-cased on construction time.
 */
LocalAddress(Channel channel) {
  StringBuilder buf = new StringBuilder(16);
  buf.append("local:E");
  buf.append(Long.toHexString(channel.hashCode() & 0xFFFFFFFFL | 0x100000000L));
  buf.setCharAt(7, ':');
  id = buf.substring(6);
  strVal = buf.toString();
}

/**
 * Joins Strings with EOL character
 *
 * @param start the starting String
 * @param linePrefix the prefix for each line to be joined
 * @param lines collection to join
 */
public static String join(String start, String linePrefix, Collection<?> lines) {
  if (lines.isEmpty()) {
    return "";
  }
  StringBuilder out = new StringBuilder(start);
  for (Object line : lines) {
    out.append(linePrefix).append(line).append("\n");
  }
  return out.substring(0, out.length() - 1); //lose last EOL
}

/**
 * Append the query string of the current request to the target redirect URL.
 * @param targetUrl the StringBuilder to append the properties to
 * @param request the current request
 * @since 4.1
 */
protected void appendCurrentQueryParams(StringBuilder targetUrl, HttpServletRequest request) {
  String query = request.getQueryString();
  if (StringUtils.hasText(query)) {
    // Extract anchor fragment, if any.
    String fragment = null;
    int anchorIndex = targetUrl.indexOf("#");
    if (anchorIndex > -1) {
      fragment = targetUrl.substring(anchorIndex);
      targetUrl.delete(anchorIndex, targetUrl.length());
    }
    if (targetUrl.toString().indexOf('?') < 0) {
      targetUrl.append('?').append(query);
    }
    else {
      targetUrl.append('&').append(query);
    }
    // Append anchor fragment, if any, to end of URL.
    if (fragment != null) {
      targetUrl.append(fragment);
    }
  }
}

private StringBuilder createNewOptionAndCall(boolean memoize,
  MethodSpec.Builder methodSpecBuilder,
  String start, List<ParameterSpec> specs) {
 StringBuilder createNewOptionAndCall = new StringBuilder(start);
 if (!specs.isEmpty()) {
  methodSpecBuilder.addParameters(specs);
  for (ParameterSpec parameter : specs) {
   createNewOptionAndCall.append(parameter.name);
   // use the Application Context to avoid memory leaks.
   if (memoize && isAndroidContext(parameter)) {
    createNewOptionAndCall.append(".getApplicationContext()");
   }
   createNewOptionAndCall.append(", ");
  }
  createNewOptionAndCall = new StringBuilder(
    createNewOptionAndCall.substring(0, createNewOptionAndCall.length() - 2));
 }
 createNewOptionAndCall.append(")");
 return createNewOptionAndCall;
}

private static String mergeLeavesIntoCollocatedString(Tree[] trees) {
 StringBuilder sb = new StringBuilder(160);
 for (Tree t: trees) {
  ArrayList<TaggedWord> sent = t.taggedYield();
  for (TaggedWord aSent : sent) {
   sb.append(aSent.word()).append('_');
  }
 }
 return sb.substring(0,sb.length() -1);
}

public String ackSetsToString(){
  StringBuilder sb = new StringBuilder();
  for (QuorumVerifierAcksetPair qvAckset : qvAcksetPairs) {
    sb.append(qvAckset.getAckset().toString()).append(",");
  }
  return sb.substring(0, sb.length()-1);
}

private static String mergeLeavesIntoCollocatedString(Tree t) {
 StringBuilder sb = new StringBuilder(160);
 ArrayList<TaggedWord> sent = t.taggedYield();
 for (TaggedWord aSent : sent) {
  sb.append(aSent.word()).append('_');
 }
 return sb.substring(0,sb.length() -1);
}

private String layoutInspect() {
  ThreadContext context = getRuntime().getCurrentContext();
  StringBuilder sb = new StringBuilder();
  for (Descriptors.FieldDescriptor fdef : descriptor.getFields()) {
    sb.append(Utils.unescapeIdentifier(fdef.getName()));
    sb.append(": ");
    sb.append(getField(context, fdef).inspect());
    sb.append(", ");
  }
  return sb.substring(0, sb.length() - 2);
}

private String newLongValue() {
  StringBuilder buf = new StringBuilder(2 * data.length + 5);
  int i = 0;
  i = appendHexDumpField(buf, i, MACHINE_ID.length);
  i = appendHexDumpField(buf, i, PROCESS_ID_LEN);
  i = appendHexDumpField(buf, i, SEQUENCE_LEN);
  i = appendHexDumpField(buf, i, TIMESTAMP_LEN);
  i = appendHexDumpField(buf, i, RANDOM_LEN);
  assert i == data.length;
  return buf.substring(0, buf.length() - 1);
}

private static TypeSpec generate(List<TypeElement> libraryModules,
  Class<? extends Annotation> annotation) {
 AnnotationSpec.Builder annotationBuilder =
   AnnotationSpec.builder(Index.class);
 String value = getAnnotationValue(annotation);
 for (TypeElement childModule : libraryModules) {
  annotationBuilder.addMember(value, "$S", ClassName.get(childModule).toString());
 }
 StringBuilder indexerName = new StringBuilder(
   INDEXER_NAME_PREFIX + annotation.getSimpleName() + "_");
 for (TypeElement element : libraryModules) {
  indexerName.append(element.getQualifiedName().toString().replace(".", "_"));
  indexerName.append("_");
 }
 indexerName = new StringBuilder(indexerName.substring(0, indexerName.length() - 1));
 return TypeSpec.classBuilder(indexerName.toString())
   .addAnnotation(annotationBuilder.build())
   .addModifiers(Modifier.PUBLIC)
   .build();
}

private String newLongValue() {
  StringBuilder buf = new StringBuilder(2 * data.length + 5);
  int i = 0;
  i = appendHexDumpField(buf, i, MACHINE_ID.length);
  i = appendHexDumpField(buf, i, PROCESS_ID_LEN);
  i = appendHexDumpField(buf, i, SEQUENCE_LEN);
  i = appendHexDumpField(buf, i, TIMESTAMP_LEN);
  i = appendHexDumpField(buf, i, RANDOM_LEN);
  assert i == data.length;
  return buf.substring(0, buf.length() - 1);
}

void run() throws IOException {
 List<String> results = new ArrayList<>();
 for (TestCase testCase : testCases) {
  results.addAll(testCase.test(strategy));
 }
 if (results.isEmpty()) {
  return;
 }
 StringBuilder failure = new StringBuilder("Failing Tests:\n");
 for (String result : results) {
  failure.append(result).append("\n");
 }
 fail(failure.substring(0, failure.length() - 1));
}

public CodeWriter startLineWithNum(int sourceLine) {
  if (sourceLine == 0) {
    startLine();
    return this;
  }
  if (ADD_LINE_NUMBERS) {
    newLine();
    attachSourceLine(sourceLine);
    String ln = "/* " + sourceLine + " */ ";
    add(ln);
    if (indentStr.length() > ln.length()) {
      add(indentStr.substring(ln.length()));
    }
  } else {
    startLine();
    attachSourceLine(sourceLine);
  }
  return this;
}