StringUtils (Spring Framework 4.0.4.RELEASE API)

java.lang.Object
- org.springframework.util.StringUtils

```
public abstract class StringUtils
extends Object
```
Miscellaneous String utility methods.
Mainly for internal use within the framework; consider Jakarta's Commons Lang for a more comprehensive suite of String utilities.
This class delivers some simple functionality that should really be provided by the core Java String and StringBuilder classes, such as the ability to replace(java.lang.String, java.lang.String, java.lang.String) all occurrences of a given substring in a target string. It also provides easy-to-use methods to convert between delimited strings, such as CSV strings, and collections and arrays.

Since:

16 April 2001

Author:

Rod Johnson, Juergen Hoeller, Keith Donald, Rob Harrop, Rick Evans, Arjen Poutsma

See Also:

StringUtils

Constructor Summary

Constructors
Constructor and Description

StringUtils()

Constructors
Constructor and Description
`StringUtils()`

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static String[]`	`addStringToArray(String[] array, String str)` Append the given String to the given String array, returning a new array consisting of the input array contents plus the given String.
`static String`	`applyRelativePath(String path, String relativePath)` Apply the given relative path to the given path, assuming standard Java folder separation (i.e.
`static String`	`arrayToCommaDelimitedString(Object[] arr)` Convenience method to return a String array as a CSV String.
`static String`	`arrayToDelimitedString(Object[] arr, String delim)` Convenience method to return a String array as a delimited (e.g.
`static String`	`capitalize(String str)` Capitalize a `String`, changing the first letter to upper case as per `Character.toUpperCase(char)`.
`static String`	`cleanPath(String path)` Normalize the path by suppressing sequences like "path/.." and inner simple dots.
`static String`	`collectionToCommaDelimitedString(Collection<?> coll)` Convenience method to return a Collection as a CSV String.
`static String`	`collectionToDelimitedString(Collection<?> coll, String delim)` Convenience method to return a Collection as a delimited (e.g.
`static String`	`collectionToDelimitedString(Collection<?> coll, String delim, String prefix, String suffix)` Convenience method to return a Collection as a delimited (e.g.
`static Set<String>`	`commaDelimitedListToSet(String str)` Convenience method to convert a CSV string list to a set.
`static String[]`	`commaDelimitedListToStringArray(String str)` Convert a CSV list into an array of Strings.
`static String[]`	`concatenateStringArrays(String[] array1, String[] array2)` Concatenate the given String arrays into one, with overlapping array elements included twice.
`static boolean`	`containsWhitespace(CharSequence str)` Check whether the given CharSequence contains any whitespace characters.
`static boolean`	`containsWhitespace(String str)` Check whether the given String contains any whitespace characters.
`static int`	`countOccurrencesOf(String str, String sub)` Count the occurrences of the substring in string s.
`static String`	`delete(String inString, String pattern)` Delete all occurrences of the given substring.
`static String`	`deleteAny(String inString, String charsToDelete)` Delete any character in a given String.
`static String[]`	`delimitedListToStringArray(String str, String delimiter)` Take a String which is a delimited list and convert it to a String array.
`static String[]`	`delimitedListToStringArray(String str, String delimiter, String charsToDelete)` Take a String which is a delimited list and convert it to a String array.
`static boolean`	`endsWithIgnoreCase(String str, String suffix)` Test if the given String ends with the specified suffix, ignoring upper/lower case.
`static String`	`getFilename(String path)` Extract the filename from the given path, e.g.
`static String`	`getFilenameExtension(String path)` Extract the filename extension from the given path, e.g.
`static boolean`	`hasLength(CharSequence str)` Check that the given CharSequence is neither `null` nor of length 0.
`static boolean`	`hasLength(String str)` Check that the given String is neither `null` nor of length 0.
`static boolean`	`hasText(CharSequence str)` Check whether the given CharSequence has actual text.
`static boolean`	`hasText(String str)` Check whether the given String has actual text.
`static boolean`	`isEmpty(Object str)` Check whether the given String is empty.
`static String[]`	`mergeStringArrays(String[] array1, String[] array2)` Merge the given String arrays into one, with overlapping array elements only included once.
`static Locale`	`parseLocaleString(String localeString)` Parse the given `localeString` value into a `Locale`.
`static TimeZone`	`parseTimeZoneString(String timeZoneString)` Parse the given `timeZoneString` value into a `TimeZone`.
`static boolean`	`pathEquals(String path1, String path2)` Compare two paths after normalization of them.
`static String`	`quote(String str)` Quote the given String with single quotes.
`static Object`	`quoteIfString(Object obj)` Turn the given Object into a String with single quotes if it is a String; keeping the Object as-is else.
`static String[]`	`removeDuplicateStrings(String[] array)` Remove duplicate Strings from the given array.
`static String`	`replace(String inString, String oldPattern, String newPattern)` Replace all occurrences of a substring within a string with another string.
`static String[]`	`sortStringArray(String[] array)` Turn given source String array into sorted array.
`static String[]`	`split(String toSplit, String delimiter)` Split a String at the first occurrence of the delimiter.
`static Properties`	`splitArrayElementsIntoProperties(String[] array, String delimiter)` Take an array Strings and split each element based on the given delimiter.
`static Properties`	`splitArrayElementsIntoProperties(String[] array, String delimiter, String charsToDelete)` Take an array Strings and split each element based on the given delimiter.
`static boolean`	`startsWithIgnoreCase(String str, String prefix)` Test if the given String starts with the specified prefix, ignoring upper/lower case.
`static String`	`stripFilenameExtension(String path)` Strip the filename extension from the given path, e.g.
`static boolean`	`substringMatch(CharSequence str, int index, CharSequence substring)` Test whether the given string matches the given substring at the given index.
`static String[]`	`tokenizeToStringArray(String str, String delimiters)` Tokenize the given String into a String array via a StringTokenizer.
`static String[]`	`tokenizeToStringArray(String str, String delimiters, boolean trimTokens, boolean ignoreEmptyTokens)` Tokenize the given String into a String array via a StringTokenizer.
`static String`	`toLanguageTag(Locale locale)` Determine the RFC 3066 compliant language tag, as used for the HTTP "Accept-Language" header.
`static String[]`	`toStringArray(Collection<String> collection)` Copy the given Collection into a String array.
`static String[]`	`toStringArray(Enumeration<String> enumeration)` Copy the given Enumeration into a String array.
`static String`	`trimAllWhitespace(String str)` Trim all whitespace from the given String: leading, trailing, and in between characters.
`static String[]`	`trimArrayElements(String[] array)` Trim the elements of the given String array, calling `String.trim()` on each of them.
`static String`	`trimLeadingCharacter(String str, char leadingCharacter)` Trim all occurrences of the supplied leading character from the given String.
`static String`	`trimLeadingWhitespace(String str)` Trim leading whitespace from the given String.
`static String`	`trimTrailingCharacter(String str, char trailingCharacter)` Trim all occurrences of the supplied trailing character from the given String.
`static String`	`trimTrailingWhitespace(String str)` Trim trailing whitespace from the given String.
`static String`	`trimWhitespace(String str)` Trim leading and trailing whitespace from the given String.
`static String`	`uncapitalize(String str)` Uncapitalize a `String`, changing the first letter to lower case as per `Character.toLowerCase(char)`.
`static String`	`unqualify(String qualifiedName)` Unqualify a string qualified by a '.' dot character.
`static String`	`unqualify(String qualifiedName, char separator)` Unqualify a string qualified by a separator character.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - StringUtils
```
public StringUtils()
```
- Method Detail
  - isEmpty
```
public static boolean isEmpty(Object str)
```
    Check whether the given String is empty.
    This method accepts any Object as an argument, comparing it to null and the empty String. As a consequence, this method will never return true for a non-null non-String object.
    The Object signature is useful for general attribute handling code that commonly deals with Strings but generally has to iterate over Objects since attributes may e.g. be primitive value objects as well.
    
    Parameters:
    
    str - the candidate String
    
    Since:
    
    3.2.1
  - hasLength
```
public static boolean hasLength(CharSequence str)
```
    Check that the given CharSequence is neither null nor of length 0. Note: Will return true for a CharSequence that purely consists of whitespace.
```
 StringUtils.hasLength(null) = false
 StringUtils.hasLength("") = false
 StringUtils.hasLength(" ") = true
 StringUtils.hasLength("Hello") = true
 
```
    Parameters:
    
    str - the CharSequence to check (may be null)
    
    Returns:
    
    true if the CharSequence is not null and has length
    
    See Also:
    
    hasText(String)
  - hasLength
```
public static boolean hasLength(String str)
```
    Check that the given String is neither null nor of length 0. Note: Will return true for a String that purely consists of whitespace.
    
    Parameters:
    
    str - the String to check (may be null)
    
    Returns:
    
    true if the String is not null and has length
    
    See Also:
    
    hasLength(CharSequence)
  - hasText
```
public static boolean hasText(CharSequence str)
```
    Check whether the given CharSequence has actual text. More specifically, returns true if the string not null, its length is greater than 0, and it contains at least one non-whitespace character.
```
 StringUtils.hasText(null) = false
 StringUtils.hasText("") = false
 StringUtils.hasText(" ") = false
 StringUtils.hasText("12345") = true
 StringUtils.hasText(" 12345 ") = true
 
```
    Parameters:
    
    str - the CharSequence to check (may be null)
    
    Returns:
    
    true if the CharSequence is not null, its length is greater than 0, and it does not contain whitespace only
    
    See Also:
    
    Character.isWhitespace(char)
  - hasText
```
public static boolean hasText(String str)
```
    Check whether the given String has actual text. More specifically, returns true if the string not null, its length is greater than 0, and it contains at least one non-whitespace character.
    
    Parameters:
    
    str - the String to check (may be null)
    
    Returns:
    
    true if the String is not null, its length is greater than 0, and it does not contain whitespace only
    
    See Also:
    
    hasText(CharSequence)
  - containsWhitespace
```
public static boolean containsWhitespace(CharSequence str)
```
    Check whether the given CharSequence contains any whitespace characters.
    
    Parameters:
    
    str - the CharSequence to check (may be null)
    
    Returns:
    
    true if the CharSequence is not empty and contains at least 1 whitespace character
    
    See Also:
    
    Character.isWhitespace(char)
  - containsWhitespace
```
public static boolean containsWhitespace(String str)
```
    Check whether the given String contains any whitespace characters.
    
    Parameters:
    
    str - the String to check (may be null)
    
    Returns:
    
    true if the String is not empty and contains at least 1 whitespace character
    
    See Also:
    
    containsWhitespace(CharSequence)
  - trimWhitespace
```
public static String trimWhitespace(String str)
```
    Trim leading and trailing whitespace from the given String.
    
    Parameters:
    
    str - the String to check
    
    Returns:
    
    the trimmed String
    
    See Also:
    
    Character.isWhitespace(char)
  - trimAllWhitespace
```
public static String trimAllWhitespace(String str)
```
    Trim all whitespace from the given String: leading, trailing, and in between characters.
    
    Parameters:
    
    str - the String to check
    
    Returns:
    
    the trimmed String
    
    See Also:
    
    Character.isWhitespace(char)
  - trimLeadingWhitespace
```
public static String trimLeadingWhitespace(String str)
```
    Trim leading whitespace from the given String.
    
    Parameters:
    
    str - the String to check
    
    Returns:
    
    the trimmed String
    
    See Also:
    
    Character.isWhitespace(char)
  - trimTrailingWhitespace
```
public static String trimTrailingWhitespace(String str)
```
    Trim trailing whitespace from the given String.
    
    Parameters:
    
    str - the String to check
    
    Returns:
    
    the trimmed String
    
    See Also:
    
    Character.isWhitespace(char)
  - trimLeadingCharacter
```
public static String trimLeadingCharacter(String str,
                                          char leadingCharacter)
```
    Trim all occurrences of the supplied leading character from the given String.
    
    Parameters:
    
    str - the String to check
    
    leadingCharacter - the leading character to be trimmed
    
    Returns:
    
    the trimmed String
  - trimTrailingCharacter
```
public static String trimTrailingCharacter(String str,
                                           char trailingCharacter)
```
    Trim all occurrences of the supplied trailing character from the given String.
    
    Parameters:
    
    str - the String to check
    
    trailingCharacter - the trailing character to be trimmed
    
    Returns:
    
    the trimmed String
  - startsWithIgnoreCase
```
public static boolean startsWithIgnoreCase(String str,
                                           String prefix)
```
    Test if the given String starts with the specified prefix, ignoring upper/lower case.
    
    Parameters:
    
    str - the String to check
    
    prefix - the prefix to look for
    
    See Also:
    
    String.startsWith(java.lang.String, int)
  - endsWithIgnoreCase
```
public static boolean endsWithIgnoreCase(String str,
                                         String suffix)
```
    Test if the given String ends with the specified suffix, ignoring upper/lower case.
    
    Parameters:
    
    str - the String to check
    
    suffix - the suffix to look for
    
    See Also:
    
    String.endsWith(java.lang.String)
  - substringMatch
```
public static boolean substringMatch(CharSequence str,
                                     int index,
                                     CharSequence substring)
```
    Test whether the given string matches the given substring at the given index.
    
    Parameters:
    
    str - the original string (or StringBuilder)
    
    index - the index in the original string to start matching against
    
    substring - the substring to match at the given index
  - countOccurrencesOf
```
public static int countOccurrencesOf(String str,
                                     String sub)
```
    Count the occurrences of the substring in string s.
    
    Parameters:
    
    str - string to search in. Return 0 if this is null.
    
    sub - string to search for. Return 0 if this is null.
  - replace
```
public static String replace(String inString,
                             String oldPattern,
                             String newPattern)
```
    Replace all occurrences of a substring within a string with another string.
    
    Parameters:
    
    inString - String to examine
    
    oldPattern - String to replace
    
    newPattern - String to insert
    
    Returns:
    
    a String with the replacements
  - delete
```
public static String delete(String inString,
                            String pattern)
```
    Delete all occurrences of the given substring.
    
    Parameters:
    
    inString - the original String
    
    pattern - the pattern to delete all occurrences of
    
    Returns:
    
    the resulting String
  - deleteAny
```
public static String deleteAny(String inString,
                               String charsToDelete)
```
    Delete any character in a given String.
    
    Parameters:
    
    inString - the original String
    
    charsToDelete - a set of characters to delete. E.g. "az\n" will delete 'a's, 'z's and new lines.
    
    Returns:
    
    the resulting String
  - quote
```
public static String quote(String str)
```
    Quote the given String with single quotes.
    
    Parameters:
    
    str - the input String (e.g. "myString")
    
    Returns:
    
    the quoted String (e.g. "'myString'"), or null if the input was null
  - quoteIfString
```
public static Object quoteIfString(Object obj)
```
    Turn the given Object into a String with single quotes if it is a String; keeping the Object as-is else.
    
    Parameters:
    
    obj - the input Object (e.g. "myString")
    
    Returns:
    
    the quoted String (e.g. "'myString'"), or the input object as-is if not a String
  - unqualify
```
public static String unqualify(String qualifiedName)
```
    Unqualify a string qualified by a '.' dot character. For example, "this.name.is.qualified", returns "qualified".
    
    Parameters:
    
    qualifiedName - the qualified name
  - unqualify
```
public static String unqualify(String qualifiedName,
                               char separator)
```
    Unqualify a string qualified by a separator character. For example, "this:name:is:qualified" returns "qualified" if using a ':' separator.
    
    Parameters:
    
    qualifiedName - the qualified name
    
    separator - the separator
  - capitalize
```
public static String capitalize(String str)
```
    Capitalize a String, changing the first letter to upper case as per Character.toUpperCase(char). No other letters are changed.
    
    Parameters:
    
    str - the String to capitalize, may be null
    
    Returns:
    
    the capitalized String, null if null
  - uncapitalize
```
public static String uncapitalize(String str)
```
    Uncapitalize a String, changing the first letter to lower case as per Character.toLowerCase(char). No other letters are changed.
    
    Parameters:
    
    str - the String to uncapitalize, may be null
    
    Returns:
    
    the uncapitalized String, null if null
  - getFilename
```
public static String getFilename(String path)
```
    Extract the filename from the given path, e.g. "mypath/myfile.txt" -> "myfile.txt".
    
    Parameters:
    
    path - the file path (may be null)
    
    Returns:
    
    the extracted filename, or null if none
  - getFilenameExtension
```
public static String getFilenameExtension(String path)
```
    Extract the filename extension from the given path, e.g. "mypath/myfile.txt" -> "txt".
    
    Parameters:
    
    path - the file path (may be null)
    
    Returns:
    
    the extracted filename extension, or null if none
  - stripFilenameExtension
```
public static String stripFilenameExtension(String path)
```
    Strip the filename extension from the given path, e.g. "mypath/myfile.txt" -> "mypath/myfile".
    
    Parameters:
    
    path - the file path (may be null)
    
    Returns:
    
    the path with stripped filename extension, or null if none
  - applyRelativePath
```
public static String applyRelativePath(String path,
                                       String relativePath)
```
    Apply the given relative path to the given path, assuming standard Java folder separation (i.e. "/" separators).
    
    Parameters:
    
    path - the path to start from (usually a full file path)
    
    relativePath - the relative path to apply (relative to the full file path above)
    
    Returns:
    
    the full file path that results from applying the relative path
  - cleanPath
```
public static String cleanPath(String path)
```
    Normalize the path by suppressing sequences like "path/.." and inner simple dots.
    The result is convenient for path comparison. For other uses, notice that Windows separators ("\") are replaced by simple slashes.
    
    Parameters:
    
    path - the original path
    
    Returns:
    
    the normalized path
  - pathEquals
```
public static boolean pathEquals(String path1,
                                 String path2)
```
    Compare two paths after normalization of them.
    
    Parameters:
    
    path1 - first path for comparison
    
    path2 - second path for comparison
    
    Returns:
    
    whether the two paths are equivalent after normalization
  - parseLocaleString
```
public static Locale parseLocaleString(String localeString)
```
    Parse the given localeString value into a Locale.
    This is the inverse operation of Locale's toString.
    
    Parameters:
    
    localeString - the locale String, following Locale's toString() format ("en", "en_UK", etc); also accepts spaces as separators, as an alternative to underscores
    
    Returns:
    
    a corresponding Locale instance
    
    Throws:
    
    IllegalArgumentException - in case of an invalid locale specification
  - toLanguageTag
```
public static String toLanguageTag(Locale locale)
```
    Determine the RFC 3066 compliant language tag, as used for the HTTP "Accept-Language" header.
    
    Parameters:
    
    locale - the Locale to transform to a language tag
    
    Returns:
    
    the RFC 3066 compliant language tag as String
  - parseTimeZoneString
```
public static TimeZone parseTimeZoneString(String timeZoneString)
```
    Parse the given timeZoneString value into a TimeZone.
    
    Parameters:
    
    timeZoneString - the time zone String, following TimeZone.getTimeZone(String) but throwing IllegalArgumentException in case of an invalid time zone specification
    
    Returns:
    
    a corresponding TimeZone instance
    
    Throws:
    
    IllegalArgumentException - in case of an invalid time zone specification
  - addStringToArray
```
public static String[] addStringToArray(String[] array,
                                        String str)
```
    Append the given String to the given String array, returning a new array consisting of the input array contents plus the given String.
    
    Parameters:
    
    array - the array to append to (can be null)
    
    str - the String to append
    
    Returns:
    
    the new array (never null)
  - concatenateStringArrays
```
public static String[] concatenateStringArrays(String[] array1,
                                               String[] array2)
```
    Concatenate the given String arrays into one, with overlapping array elements included twice.
    The order of elements in the original arrays is preserved.
    
    Parameters:
    
    array1 - the first array (can be null)
    
    array2 - the second array (can be null)
    
    Returns:
    
    the new array (null if both given arrays were null)
  - mergeStringArrays
```
public static String[] mergeStringArrays(String[] array1,
                                         String[] array2)
```
    Merge the given String arrays into one, with overlapping array elements only included once.
    The order of elements in the original arrays is preserved (with the exception of overlapping elements, which are only included on their first occurrence).
    
    Parameters:
    
    array1 - the first array (can be null)
    
    array2 - the second array (can be null)
    
    Returns:
    
    the new array (null if both given arrays were null)
  - sortStringArray
```
public static String[] sortStringArray(String[] array)
```
    Turn given source String array into sorted array.
    
    Parameters:
    
    array - the source array
    
    Returns:
    
    the sorted array (never null)
  - toStringArray
```
public static String[] toStringArray(Collection<String> collection)
```
    Copy the given Collection into a String array. The Collection must contain String elements only.
    
    Parameters:
    
    collection - the Collection to copy
    
    Returns:
    
    the String array (null if the passed-in Collection was null)
  - toStringArray
```
public static String[] toStringArray(Enumeration<String> enumeration)
```
    Copy the given Enumeration into a String array. The Enumeration must contain String elements only.
    
    Parameters:
    
    enumeration - the Enumeration to copy
    
    Returns:
    
    the String array (null if the passed-in Enumeration was null)
  - trimArrayElements
```
public static String[] trimArrayElements(String[] array)
```
    Trim the elements of the given String array, calling String.trim() on each of them.
    
    Parameters:
    
    array - the original String array
    
    Returns:
    
    the resulting array (of the same size) with trimmed elements
  - removeDuplicateStrings
```
public static String[] removeDuplicateStrings(String[] array)
```
    Remove duplicate Strings from the given array. Also sorts the array, as it uses a TreeSet.
    
    Parameters:
    
    array - the String array
    
    Returns:
    
    an array without duplicates, in natural sort order
  - split
```
public static String[] split(String toSplit,
                             String delimiter)
```
    Split a String at the first occurrence of the delimiter. Does not include the delimiter in the result.
    
    Parameters:
    
    toSplit - the string to split
    
    delimiter - to split the string up with
    
    Returns:
    
    a two element array with index 0 being before the delimiter, and index 1 being after the delimiter (neither element includes the delimiter); or null if the delimiter wasn't found in the given input String
  - splitArrayElementsIntoProperties
```
public static Properties splitArrayElementsIntoProperties(String[] array,
                                                          String delimiter)
```
    Take an array Strings and split each element based on the given delimiter. A Properties instance is then generated, with the left of the delimiter providing the key, and the right of the delimiter providing the value.
    Will trim both the key and value before adding them to the Properties instance.
    
    Parameters:
    
    array - the array to process
    
    delimiter - to split each element using (typically the equals symbol)
    
    Returns:
    
    a Properties instance representing the array contents, or null if the array to process was null or empty
  - splitArrayElementsIntoProperties
```
public static Properties splitArrayElementsIntoProperties(String[] array,
                                                          String delimiter,
                                                          String charsToDelete)
```
    Take an array Strings and split each element based on the given delimiter. A Properties instance is then generated, with the left of the delimiter providing the key, and the right of the delimiter providing the value.
    Will trim both the key and value before adding them to the Properties instance.
    
    Parameters:
    
    array - the array to process
    
    delimiter - to split each element using (typically the equals symbol)
    
    charsToDelete - one or more characters to remove from each element prior to attempting the split operation (typically the quotation mark symbol), or null if no removal should occur
    
    Returns:
    
    a Properties instance representing the array contents, or null if the array to process was null or empty
  - tokenizeToStringArray
```
public static String[] tokenizeToStringArray(String str,
                                             String delimiters)
```
    Tokenize the given String into a String array via a StringTokenizer. Trims tokens and omits empty tokens.
    The given delimiters string is supposed to consist of any number of delimiter characters. Each of those characters can be used to separate tokens. A delimiter is always a single character; for multi-character delimiters, consider using delimitedListToStringArray
    
    Parameters:
    
    str - the String to tokenize
    
    delimiters - the delimiter characters, assembled as String (each of those characters is individually considered as delimiter).
    
    Returns:
    
    an array of the tokens
    
    See Also:
    
    StringTokenizer, String.trim(), delimitedListToStringArray(java.lang.String, java.lang.String)
  - tokenizeToStringArray
```
public static String[] tokenizeToStringArray(String str,
                                             String delimiters,
                                             boolean trimTokens,
                                             boolean ignoreEmptyTokens)
```
    Tokenize the given String into a String array via a StringTokenizer.
    The given delimiters string is supposed to consist of any number of delimiter characters. Each of those characters can be used to separate tokens. A delimiter is always a single character; for multi-character delimiters, consider using delimitedListToStringArray
    
    Parameters:
    
    str - the String to tokenize
    
    delimiters - the delimiter characters, assembled as String (each of those characters is individually considered as delimiter)
    
    trimTokens - trim the tokens via String's trim
    
    ignoreEmptyTokens - omit empty tokens from the result array (only applies to tokens that are empty after trimming; StringTokenizer will not consider subsequent delimiters as token in the first place).
    
    Returns:
    
    an array of the tokens (null if the input String was null)
    
    See Also:
    
    StringTokenizer, String.trim(), delimitedListToStringArray(java.lang.String, java.lang.String)
  - delimitedListToStringArray
```
public static String[] delimitedListToStringArray(String str,
                                                  String delimiter)
```
    Take a String which is a delimited list and convert it to a String array.
    A single delimiter can consists of more than one character: It will still be considered as single delimiter string, rather than as bunch of potential delimiter characters - in contrast to tokenizeToStringArray.
    
    Parameters:
    
    str - the input String
    
    delimiter - the delimiter between elements (this is a single delimiter, rather than a bunch individual delimiter characters)
    
    Returns:
    
    an array of the tokens in the list
    
    See Also:
    
    tokenizeToStringArray(java.lang.String, java.lang.String)
  - delimitedListToStringArray
```
public static String[] delimitedListToStringArray(String str,
                                                  String delimiter,
                                                  String charsToDelete)
```
    Take a String which is a delimited list and convert it to a String array.
    A single delimiter can consists of more than one character: It will still be considered as single delimiter string, rather than as bunch of potential delimiter characters - in contrast to tokenizeToStringArray.
    
    Parameters:
    
    str - the input String
    
    delimiter - the delimiter between elements (this is a single delimiter, rather than a bunch individual delimiter characters)
    
    charsToDelete - a set of characters to delete. Useful for deleting unwanted line breaks: e.g. "\r\n\f" will delete all new lines and line feeds in a String.
    
    Returns:
    
    an array of the tokens in the list
    
    See Also:
    
    tokenizeToStringArray(java.lang.String, java.lang.String)
  - commaDelimitedListToStringArray
```
public static String[] commaDelimitedListToStringArray(String str)
```
    Convert a CSV list into an array of Strings.
    
    Parameters:
    
    str - the input String
    
    Returns:
    
    an array of Strings, or the empty array in case of empty input
  - commaDelimitedListToSet
```
public static Set<String> commaDelimitedListToSet(String str)
```
    Convenience method to convert a CSV string list to a set. Note that this will suppress duplicates.
    
    Parameters:
    
    str - the input String
    
    Returns:
    
    a Set of String entries in the list
  - collectionToDelimitedString
```
public static String collectionToDelimitedString(Collection<?> coll,
                                                 String delim,
                                                 String prefix,
                                                 String suffix)
```
    Convenience method to return a Collection as a delimited (e.g. CSV) String. E.g. useful for toString() implementations.
    
    Parameters:
    
    coll - the Collection to display
    
    delim - the delimiter to use (probably a ",")
    
    prefix - the String to start each element with
    
    suffix - the String to end each element with
    
    Returns:
    
    the delimited String
  - collectionToDelimitedString
```
public static String collectionToDelimitedString(Collection<?> coll,
                                                 String delim)
```
    Convenience method to return a Collection as a delimited (e.g. CSV) String. E.g. useful for toString() implementations.
    
    Parameters:
    
    coll - the Collection to display
    
    delim - the delimiter to use (probably a ",")
    
    Returns:
    
    the delimited String
  - collectionToCommaDelimitedString
```
public static String collectionToCommaDelimitedString(Collection<?> coll)
```
    Convenience method to return a Collection as a CSV String. E.g. useful for toString() implementations.
    
    Parameters:
    
    coll - the Collection to display
    
    Returns:
    
    the delimited String
  - arrayToDelimitedString
```
public static String arrayToDelimitedString(Object[] arr,
                                            String delim)
```
    Convenience method to return a String array as a delimited (e.g. CSV) String. E.g. useful for toString() implementations.
    
    Parameters:
    
    arr - the array to display
    
    delim - the delimiter to use (probably a ",")
    
    Returns:
    
    the delimited String
  - arrayToCommaDelimitedString
```
public static String arrayToCommaDelimitedString(Object[] arr)
```
    Convenience method to return a String array as a CSV String. E.g. useful for toString() implementations.
    
    Parameters:
    
    arr - the array to display
    
    Returns:
    
    the delimited String

Class StringUtils

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

StringUtils

Method Detail

isEmpty

hasLength

hasLength

hasText

hasText

containsWhitespace

containsWhitespace

trimWhitespace

trimAllWhitespace

trimLeadingWhitespace

trimTrailingWhitespace

trimLeadingCharacter

trimTrailingCharacter

startsWithIgnoreCase

endsWithIgnoreCase

substringMatch

countOccurrencesOf

replace

delete

deleteAny

quote

quoteIfString

unqualify

unqualify

capitalize

uncapitalize

getFilename

getFilenameExtension

stripFilenameExtension

applyRelativePath

cleanPath

pathEquals

parseLocaleString

toLanguageTag

parseTimeZoneString

addStringToArray

concatenateStringArrays

mergeStringArrays

sortStringArray

toStringArray

toStringArray

trimArrayElements

removeDuplicateStrings

split

splitArrayElementsIntoProperties

splitArrayElementsIntoProperties

tokenizeToStringArray

tokenizeToStringArray

delimitedListToStringArray

delimitedListToStringArray

commaDelimitedListToStringArray

commaDelimitedListToSet

collectionToDelimitedString

collectionToDelimitedString

collectionToCommaDelimitedString

arrayToDelimitedString

arrayToCommaDelimitedString