StringUtil (jsoup Java HTML Parser 1.12.1 API)

java.lang.Object
- org.jsoup.internal.StringUtil

```
public final class StringUtil
extends Object
```
A minimal String utility class. Designed for internal jsoup use only.

Constructor Summary

Constructors
Constructor	Description
`StringUtil()`

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static void`	`appendNormalisedWhitespace(StringBuilder accum, String string, boolean stripLeading)`	After normalizing the whitespace within a string, appends it to a string builder.
`static StringBuilder`	`borrowBuilder()`	Maintains cached StringBuilders in a flyweight pattern, to minimize new StringBuilder GCs.
`static boolean`	`in(String needle, String... haystack)`
`static boolean`	`inSorted(String needle, String[] haystack)`
`static boolean`	`isActuallyWhitespace(int c)`	Tests if a code point is "whitespace" as defined by what it looks like.
`static boolean`	`isBlank(String string)`	Tests if a string is blank: null, empty, or only whitespace (" ", \r\n, \t, etc)
`static boolean`	`isInvisibleChar(int c)`
`static boolean`	`isNumeric(String string)`	Tests if a string is numeric, i.e.
`static boolean`	`isWhitespace(int c)`	Tests if a code point is "whitespace" as defined in the HTML spec.
`static String`	`join(String[] strings, String sep)`	Join an array of strings by a separator
`static String`	`join(Collection strings, String sep)`	Join a collection of strings by a separator
`static String`	`join(Iterator strings, String sep)`	Join a collection of strings by a separator
`static String`	`normaliseWhitespace(String string)`	Normalise the whitespace within this string; multiple spaces collapse to a single, and all whitespace characters (e.g.
`static String`	`padding(int width)`	Returns space padding
`static String`	`releaseBuilder(StringBuilder sb)`	Release a borrowed builder.
`static String`	`resolve(String baseUrl, String relUrl)`	Create a new absolute URL, from a provided existing absolute URL and a relative URL component.
`static URL`	`resolve(URL base, String relUrl)`	Create a new absolute URL, from a provided existing absolute URL and a relative URL component.

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

- Constructor Detail
  - StringUtil
```
public StringUtil()
```
- Method Detail
  - join
```
public static String join(Collection strings,
                          String sep)
```
    Join a collection of strings by a separator
    
    Parameters:
    
    strings - collection of string objects
    
    sep - string to place between strings
    
    Returns:
    
    joined string
  - join
```
public static String join(Iterator strings,
                          String sep)
```
    Join a collection of strings by a separator
    
    Parameters:
    
    strings - iterator of string objects
    
    sep - string to place between strings
    
    Returns:
    
    joined string
  - join
```
public static String join(String[] strings,
                          String sep)
```
    Join an array of strings by a separator
    
    Parameters:
    
    strings - collection of string objects
    
    sep - string to place between strings
    
    Returns:
    
    joined string
  - padding
```
public static String padding(int width)
```
    Returns space padding
    
    Parameters:
    
    width - amount of padding desired
    
    Returns:
    
    string of spaces * width
  - isBlank
```
public static boolean isBlank(String string)
```
    Tests if a string is blank: null, empty, or only whitespace (" ", \r\n, \t, etc)
    
    Parameters:
    
    string - string to test
    
    Returns:
    
    if string is blank
  - isNumeric
```
public static boolean isNumeric(String string)
```
    Tests if a string is numeric, i.e. contains only digit characters
    
    Parameters:
    
    string - string to test
    
    Returns:
    
    true if only digit chars, false if empty or null or contains non-digit chars
  - isWhitespace
```
public static boolean isWhitespace(int c)
```
    Tests if a code point is "whitespace" as defined in the HTML spec. Used for output HTML.
    
    Parameters:
    
    c - code point to test
    
    Returns:
    
    true if code point is whitespace, false otherwise
    
    See Also:
    
    isActuallyWhitespace(int)
  - isActuallyWhitespace
```
public static boolean isActuallyWhitespace(int c)
```
    Tests if a code point is "whitespace" as defined by what it looks like. Used for Element.text etc.
    
    Parameters:
    
    c - code point to test
    
    Returns:
    
    true if code point is whitespace, false otherwise
  - isInvisibleChar
```
public static boolean isInvisibleChar(int c)
```
  - normaliseWhitespace
```
public static String normaliseWhitespace(String string)
```
    Normalise the whitespace within this string; multiple spaces collapse to a single, and all whitespace characters (e.g. newline, tab) convert to a simple space
    
    Parameters:
    
    string - content to normalise
    
    Returns:
    
    normalised string
  - appendNormalisedWhitespace
```
public static void appendNormalisedWhitespace(StringBuilder accum,
                                              String string,
                                              boolean stripLeading)
```
    After normalizing the whitespace within a string, appends it to a string builder.
    
    Parameters:
    
    accum - builder to append to
    
    string - string to normalize whitespace within
    
    stripLeading - set to true if you wish to remove any leading whitespace
  - in
```
public static boolean in(String needle,
                         String... haystack)
```
  - inSorted
```
public static boolean inSorted(String needle,
                               String[] haystack)
```
  - resolve
```
public static URL resolve(URL base,
                          String relUrl)
                   throws MalformedURLException
```
    Create a new absolute URL, from a provided existing absolute URL and a relative URL component.
    
    Parameters:
    
    base - the existing absolute base URL
    
    relUrl - the relative URL to resolve. (If it's already absolute, it will be returned)
    
    Returns:
    
    the resolved absolute URL
    
    Throws:
    
    MalformedURLException - if an error occurred generating the URL
  - resolve
```
public static String resolve(String baseUrl,
                             String relUrl)
```
    Create a new absolute URL, from a provided existing absolute URL and a relative URL component.
    
    Parameters:
    
    baseUrl - the existing absolute base URL
    
    relUrl - the relative URL to resolve. (If it's already absolute, it will be returned)
    
    Returns:
    
    an absolute URL if one was able to be generated, or the empty string if not
  - borrowBuilder
```
public static StringBuilder borrowBuilder()
```
    Maintains cached StringBuilders in a flyweight pattern, to minimize new StringBuilder GCs. The StringBuilder is prevented from growing too large.
    Care must be taken to release the builder once its work has been completed, with {@see #releaseBuilder}
    
    Returns:
    
    an empty StringBuilder
  - releaseBuilder
```
public static String releaseBuilder(StringBuilder sb)
```
    Release a borrowed builder. Care must be taken not to use the builder after it has been returned, as its contents may be changed by this method, or by a concurrent thread.
    
    Parameters:
    
    sb - the StringBuilder to release.
    
    Returns:
    
    the string value of the released String Builder (as an incentive to release it!).

Class StringUtil

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

StringUtil

Method Detail

join

join

join

padding

isBlank

isNumeric

isWhitespace

isActuallyWhitespace

isInvisibleChar

normaliseWhitespace

appendNormalisedWhitespace

in

inSorted

resolve

resolve

borrowBuilder

releaseBuilder