Tests whether two arrays are the same length, treating {@code null} arrays as length {@code 0}. @param array1 the first array, may be {@code null}. @

Returns the string representation of the {@code char} array or null. @param value the character array. @return a String or null. @see String#valueOf(

Gets the value of this mutable. @return the stored value. @since 3.18.0

Gets the (initialized) class represented by {@code className} using the {@code classLoader}. This implementation supports the syntaxes "{@code java.ut

Tests whether the Java version matches. <p> This method is package private instead of private to support unit test invocation. </p> @param version

Tests whether the Java version is at least the requested version. <p> The result is based on the system property saved in {@link #JAVA_SPECIFICATION_V

Tests whether the Java version is at most the requested version. <p> The result is based on the system property saved in {@link #JAVA_SPECIFICATION_VE

Asserts that execution of the given {@code executable} throws a {@link IllegalArgumentException}. <p> The assertion passes if the thrown exception ty

Asserts that execution of the given {@code executable} throws a {@link NullPointerException}. <p> The assertion passes if the thrown exception type i

Gets an array's component type. @param <T> The array type. @param array The array. @return The component type. @since 3.13.0

Gets a String version of the string builder, creating a new instance each time the method is called. <p> Note that unlike StringBuffer, the string ver

Appends a boolean value to the string builder. @param value the value to append. @return {@code this} instance.

Equivalent to DateFormat.parse(String). See {@link java.text.DateFormat#parse(String)} for more information. @param source A {@link String} whose be

Checks whether the specified element occurs within this range. @param element the element to check for, null returns false. @return true if the spec

Tests whether two arrays have equal content, using equals(), handling multidimensional arrays correctly. <p> Multi-dimensional primitive arrays are al

Tests whether one {@link Class} can be assigned to a variable of another {@link Class}. <p> Unlike the {@link Class#isAssignableFrom(java.lang.Class)

Returns a negative integer, a positive integer, or zero as the {@code builder} has judged the "left-hand" side as less than, greater than, or equal to

Creates a {@link Fraction} instance from a {@code double} value. <p> This method uses the <a href="https://web.archive.org/web/20210516065058/http%3A/

Gets the length of the string builder. <p> This method is the same as {@link #length()} and is provided to match the API of Collections. </p> @return

Gets a CharSequence length or {@code 0} if the CharSequence is {@code null}. @param cs a CharSequence or {@code null}. @return CharSequence length or

Formats a {@link Calendar} object. The TimeZone set on the Calendar is only used to adjust the time offset. The TimeZone specified during the construc

Gets a System property, defaulting to {@code null} if the property cannot be read. <p> If a {@link SecurityException} is caught, the return value is {

Gets the message for string presentation. @return the message for string presentation. @since 3.10

Null-safe version of {@code cls.getName()} @param cls the class for which to get the class name; may be null. @return the class name or the empty str

Gets the time on this StopWatch. <p> This is either the time between the start and the moment this method is called, or the amount of time between st

Gets the character at the specified index. @param index the index to retrieve, must be valid. @return the character at the index. @throws IndexOutOf

Removes the elements at the specified positions from the specified array. All remaining elements are shifted to the left. <p> This method returns a ne

Asserts that execution of the given {@code executable} throws a {@link IndexOutOfBoundsException}. <p> The assertion passes if the thrown exception t

Evaluates this predicate on the given thread. @param thread the thread @return {@code true} if the thread matches the predicate, otherwise {@code fal

Finds the index of the given value in the array. <p> This method returns {@link #INDEX_NOT_FOUND} ({@code -1}) for a {@code null} input array. </p> @

Gets the length of the string builder. @return the length

Sets the bit at the specified indexes to {@code true}. @param bitIndexArray a bit index array. @throws IndexOutOfBoundsException if the specified ind

Gets the value of the bit with the specified index. The value is {@code true} if the bit with the index {@code bitIndex} is currently set in this {@li

Joins the elements of the provided array into a single String containing the provided list of elements. <p> No delimiter is added before or after the

Creates a {@link Number} from a {@link String}. <p> If the string starts with {@code 0x} or {@code -0x} (lower or upper case) or {@code #} or {@code

Finds the last index of the given value within the array. <p> This method returns {@link #INDEX_NOT_FOUND} ({@code -1}) if {@code null} array input. <

Tests if the subject type may be implicitly cast to the target class following the Java generics rules. @param type the subject type to be assigne

Finds the indices of the given value in the array. <p> This method returns an empty BitSet for a {@code null} input array. </p> @param array the arr

Produces a new {@code boolean} array containing the elements between the start and end indices. <p> The start index is inclusive, the end index exclus

Swaps two elements in the given boolean array. <p>There is no special handling for multi-dimensional arrays. This method does nothing for a {@code nu

Tests whether an array of primitive booleans is empty or {@code null}. @param array the array to test. @return {@code true} if the array is empty or

Creates a range with the specified minimum and maximum values (both inclusive). <p>The range uses the natural ordering of the elements to determine w

Performs a mutable reduction operation on the elements of this stream using a {@link Collector}. A {@link Collector} encapsulates the functions used

Gets an accessible {@link Field} by name respecting scope. Only the specified class will be considered. @param cls the {@link Class} to re

Gets the denominator part of the fraction. @return the denominator fraction part

Gets the numerator part of the fraction. <p> This method may return a value greater than the denominator, an improper fraction, such as the seven in 7

Shifts the order of the given boolean array. <p>There is no special handling for multi-dimensional arrays. This method does nothing for {@code null}

Performs the operation given the specified arguments. @param k the first input argument @param v the second input argument @param s the third input a

Returns a reference to the object being constructed or result being calculated by the builder. @return the object constructed or result calculated by

Clones an array or returns {@code null}. <p> This method returns {@code null} for a {@code null} input array. </p> @param array the array to clone, m

Removes occurrences of specified elements, in specified quantities, from the specified array. All subsequent elements are shifted left. For any elemen

Copies the given array and adds the given element at the end of the new array. <p> The new array contains the same elements of the input array plus th

Inserts elements into an array at the given index (starting from zero). <p> When an array is returned, it is always a new array. </p> <pre> ArrayUti

Tests if a CharSequence is empty ("") or null. <pre> StringUtils.isEmpty(null) = true StringUtils.isEmpty("") = true StringUtils.isEmpty(

Gets a substring from the specified String avoiding exceptions. <p> A negative start position can be used to start {@code n} characters from the end

Gets the next token. @return the next String token. @throws NoSuchElementException if there are no more elements.

Applies this function to the given arguments. @param t the first function argument @param u the second function argument @param v the third function

Copies the builder's character array into a new character array. @return a new array that represents the contents of the builder.

A fluent version of {@link System#arraycopy(Object, int, Object, int, int)} that returns the destination array. @param <T> the type. @param sou

Checks if the value is in the given array. <p> The method returns {@code false} if a {@code null} array is passed in. </p> @param array the array to

Searches the string builder to find the first reference to the specified char. @param ch the character to find. @return the first index of the chara

Rounds a date, leaving the field specified as the most significant field. <p>For example, if you had the date-time of 28 Mar 2002 13:45:01.231, if th

Returns the computed {@code hashCode}. @return {@code hashCode} based on the fields appended

Tests whether the number of matching characters, zero for no match. <p> This method is called to check for a match. The parameter {@code pos} represen

Tests whether this range is overlapped by the specified range. <p>Two ranges overlap if there is at least one element in common.</p> <p>This method

Is the character specified contained in this range. @param ch the character to check. @return {@code true} if this range contains the input characte

Converts an array of object Booleans to primitives. <p> This method returns {@code null} for a {@code null} input array. </p> <p> Null array elements

Uses reflection to determine if the two {@link Object}s are equal. <p>It uses {@code AccessibleObject.setAccessible} to gain access to private fields

Removes the element at the specified position from the specified array. All subsequent elements are shifted to the left (subtracts one from their indi

Returns a new {@link List} containing the tokenizer elements. @return a new {@link List}.

Appends to the {@code toString} a {@code boolean} value. @param buffer the {@link StringBuffer} to populate. @param fieldName the field name. @par

Searches the string builder to find the last reference to the specified char. @param ch the character to find. @return the last index of the charact

Formats the time gap as a string, using the specified format, and padding with zeros. <p> This method formats durations using the days and lower field

Creates a new CharSet using the syntax described below. <ul> <li>{@code null} or empty string ("") - set containing no characters</li> <li>Single c

Defensive programming technique to change a {@code null} reference to an empty one. <p> This method returns an empty array for a {@code null} input ar

Truncates a date, leaving the field specified as the most significant field. <p>For example, if you had the date-time of 28 Mar 2002 13:45:01.231, if

Search a CharSequence to find the first index of any character in the given set of characters. <p> A {@code null} String will return {@code -1}. A {@

Extracts the initial characters from each word in the String. <p>All first characters after whitespace are returned as a new string. Their case is no

Returns the maximum value in an array. @param array an array, must not be null or empty. @return the maximum value in the array. @throws NullPointerE

Checks whether this range contains all the elements of the specified range. <p>This method may fail if the ranges have two different comparators or e

Gets the fraction as an {@code int}. This returns the whole number part of the fraction. @return the whole number fraction part