How to use

lastIndexOf

method

in

java.lang.String

/**
 * Returns the package name of {@code classFullName} according to the Java Language Specification
 * (section 6.7). Unlike {@link Class#getPackage}, this method only parses the class name, without
 * attempting to define the {@link Package} and hence load files.
 */
public static String getPackageName(String classFullName) {
 int lastDot = classFullName.lastIndexOf('.');
 return (lastDot < 0) ? "" : classFullName.substring(0, lastDot);
}

/**
 * Unqualify a string qualified by a separator character. For example,
 * "this:name:is:qualified" returns "qualified" if using a ':' separator.
 * @param qualifiedName the qualified name
 * @param separator the separator
 */
public static String unqualify(String qualifiedName, char separator) {
  return qualifiedName.substring(qualifiedName.lastIndexOf(separator) + 1);
}

/**
 * Determine the name of the package of the given fully-qualified class name,
 * e.g. "java.lang" for the {@code java.lang.String} class name.
 * @param fqClassName the fully-qualified class name
 * @return the package name, or the empty String if the class
 * is defined in the default package
 */
public static String getPackageName(String fqClassName) {
  Assert.notNull(fqClassName, "Class name must not be null");
  int lastDotIndex = fqClassName.lastIndexOf(PACKAGE_SEPARATOR);
  return (lastDotIndex != -1 ? fqClassName.substring(0, lastDotIndex) : "");
}

/**
 * Extract the URL filename from the given request URI.
 * @param uri the request URI; for example {@code "/index.html"}
 * @return the extracted URI filename; for example {@code "index"}
 */
protected String extractViewNameFromUrlPath(String uri) {
  int start = (uri.charAt(0) == '/' ? 1 : 0);
  int lastIndex = uri.lastIndexOf('.');
  int end = (lastIndex < 0 ? uri.length() : lastIndex);
  return uri.substring(start, end);
}

/**
 * Determine the name of the class file, relative to the containing
 * package: e.g. "String.class"
 * @param clazz the class
 * @return the file name of the ".class" file
 */
public static String getClassFileName(Class<?> clazz) {
  Assert.notNull(clazz, "Class must not be null");
  String className = clazz.getName();
  int lastDotIndex = className.lastIndexOf(PACKAGE_SEPARATOR);
  return className.substring(lastDotIndex + 1) + CLASS_FILE_SUFFIX;
}

public static String simpleClassName(Class<?> clazz) {
  if (clazz == null) {
    throw new NullPointerException("clazz");
  }
  String className = clazz.getName();
  final int lastDotIdx = className.lastIndexOf(PACKAGE_SEPARATOR_CHAR);
  if (lastDotIdx > -1) {
    return className.substring(lastDotIdx + 1);
  }
  return className;
}

 private static String getSubmittedFileName(Part part) {
  for (String cd : part.getHeader("content-disposition").split(";")) {
    if (cd.trim().startsWith("filename")) {
      String fileName = cd.substring(cd.indexOf('=') + 1).trim().replace("\"", "");
      return fileName.substring(fileName.lastIndexOf('/') + 1).substring(fileName.lastIndexOf('\\') + 1); // MSIE fix.
    }
  }
  return null;
}

@Override
public String extractVersion(String requestPath) {
  Matcher matcher = pattern.matcher(requestPath);
  if (matcher.find()) {
    String match = matcher.group(1);
    return (match.contains("-") ? match.substring(match.lastIndexOf('-') + 1) : match);
  }
  else {
    return null;
  }
}

@Override
@Nullable
public String extractVersion(String requestPath) {
  Matcher matcher = pattern.matcher(requestPath);
  if (matcher.find()) {
    String match = matcher.group(1);
    return (match.contains("-") ? match.substring(match.lastIndexOf('-') + 1) : match);
  }
  else {
    return null;
  }
}

private String getEntityName(Class<?> entityClass) {
  String shortName = ClassUtils.getShortName(entityClass);
  int lastDot = shortName.lastIndexOf('.');
  if (lastDot != -1) {
    return shortName.substring(lastDot + 1);
  }
  else {
    return shortName;
  }
}

@Override
public int lastIndexOf(@Nullable Object object) {
 return (object instanceof Character) ? string.lastIndexOf((Character) object) : -1;
}

private static @Nullable String convertDottedQuadToHex(String ipString) {
 int lastColon = ipString.lastIndexOf(':');
 String initialPart = ipString.substring(0, lastColon + 1);
 String dottedQuad = ipString.substring(lastColon + 1);
 byte[] quad = textToNumericFormatV4(dottedQuad);
 if (quad == null) {
  return null;
 }
 String penultimate = Integer.toHexString(((quad[0] & 0xff) << 8) | (quad[1] & 0xff));
 String ultimate = Integer.toHexString(((quad[2] & 0xff) << 8) | (quad[3] & 0xff));
 return initialPart + penultimate + ":" + ultimate;
}

public URL setAddress(String address) {
  int i = address.lastIndexOf(':');
  String host;
  int port = this.port;
  if (i >= 0) {
    host = address.substring(0, i);
    port = Integer.parseInt(address.substring(i + 1));
  } else {
    host = address;
  }
  return new URL(protocol, username, password, host, port, path, getParameters());
}

public static Method findMethod(String desc, ClassLoader loader) {
  try {
    int lparen = desc.indexOf('(');
    int dot = desc.lastIndexOf('.', lparen);
    String className = desc.substring(0, dot).trim();
    String methodName = desc.substring(dot + 1, lparen).trim();
    return getClass(className, loader).getDeclaredMethod(methodName, parseTypes(desc, loader));
  }
  catch (ClassNotFoundException | NoSuchMethodException ex) {
    throw new CodeGenerationException(ex);
  }
}

private void adaptForwardedHost(String hostToUse) {
  int portSeparatorIdx = hostToUse.lastIndexOf(':');
  if (portSeparatorIdx > hostToUse.lastIndexOf(']')) {
    host(hostToUse.substring(0, portSeparatorIdx));
    port(Integer.parseInt(hostToUse.substring(portSeparatorIdx + 1)));
  }
  else {
    host(hostToUse);
    port(null);
  }
}

private List<URL> toUrlsWithEmpty(URL consumer, String path, List<String> providers) {
  List<URL> urls = toUrlsWithoutEmpty(consumer, providers);
  if (urls == null || urls.isEmpty()) {
    int i = path.lastIndexOf(Constants.PATH_SEPARATOR);
    String category = i < 0 ? path : path.substring(i + 1);
    URL empty = consumer.setProtocol(Constants.EMPTY_PROTOCOL).addParameter(Constants.CATEGORY_KEY, category);
    urls.add(empty);
  }
  return urls;
}

private String getInputTag(String output) {
  int inputStart = output.indexOf("<", 1);
  int inputEnd = output.lastIndexOf(">", output.length() - 2);
  return output.substring(inputStart, inputEnd + 1);
}

@Nullable
private String decodeAndNormalizePath(@Nullable String path, HttpServletRequest request) {
  if (path != null) {
    path = getUrlPathHelper().decodeRequestString(request, path);
    if (path.charAt(0) != '/') {
      String requestUri = getUrlPathHelper().getRequestUri(request);
      path = requestUri.substring(0, requestUri.lastIndexOf('/') + 1) + path;
      path = StringUtils.cleanPath(path);
    }
  }
  return path;
}

private String getFormTag(String output) {
  int inputStart = output.indexOf("<", 1);
  int inputEnd = output.lastIndexOf(">", output.length() - 2);
  return output.substring(0, inputStart) + output.substring(inputEnd + 1);
}

protected final void assertBlockTagContains(String output, String desiredContents) {
  String contents = output.substring(output.indexOf(">") + 1, output.lastIndexOf("<"));
  assertTrue("Expected to find '" + desiredContents + "' in the contents of block tag '" + output + "'",
      contents.contains(desiredContents));
}