Uses of Interface
java.util.Comparator

Packages that use Comparator

Package	Description
java.lang	Provides classes that are fundamental to the design of the Java programming language.
java.text	Provides classes and interfaces for handling text, dates, numbers, and messages in a manner independent of natural languages.
java.time	The main API for dates, times, instants, and durations.
java.time.chrono	Generic API for calendar systems other than the default ISO.
java.util	Contains the collections framework, legacy collection classes, event model, date and time facilities, internationalization, and miscellaneous utility classes (a string tokenizer, a random-number generator, and a bit array).
java.util.concurrent	Utility classes commonly useful in concurrent programming.
java.util.function	Functional interfaces provide target types for lambda expressions and method references.
java.util.stream	Classes to support functional-style operations on streams of elements, such as map-reduce transformations on collections.
javax.swing	Provides a set of "lightweight" (all-Java language) components that, to the maximum degree possible, work the same on all platforms.
javax.swing.table	Provides classes and interfaces for dealing with javax.swing.JTable.

Uses of Comparator in java.lang

Fields in java.lang declared as Comparator

Modifier and Type	Field and Description
static Comparator<String>	String.CASE_INSENSITIVE_ORDER A Comparator that orders String objects as by compareToIgnoreCase.

Uses of Comparator in java.text

Classes in java.text that implement Comparator

Modifier and Type	Class and Description
class	Collator The Collator class performs locale-sensitive String comparison.
class	RuleBasedCollator The RuleBasedCollator class is a concrete subclass of Collator that provides a simple, data-driven, table collator.

Uses of Comparator in java.time

Methods in java.time that return Comparator

Modifier and Type	Method and Description
static Comparator<OffsetDateTime>	OffsetDateTime.timeLineOrder() Gets a comparator that compares two OffsetDateTime instances based solely on the instant.

Uses of Comparator in java.time.chrono

Methods in java.time.chrono that return Comparator

Modifier and Type	Method and Description
static Comparator<ChronoLocalDateTime<?>>	ChronoLocalDateTime.timeLineOrder() Gets a comparator that compares ChronoLocalDateTime in time-line order ignoring the chronology.
static Comparator<ChronoLocalDate>	ChronoLocalDate.timeLineOrder() Gets a comparator that compares ChronoLocalDate in time-line order ignoring the chronology.
static Comparator<ChronoZonedDateTime<?>>	ChronoZonedDateTime.timeLineOrder() Gets a comparator that compares ChronoZonedDateTime in time-line order ignoring the chronology.

Uses of Comparator in java.util

Methods in java.util that return Comparator

Modifier and Type	Method and Description
Comparator<? super E>	TreeSet.comparator()
Comparator<? super E>	PriorityQueue.comparator() Returns the comparator used to order the elements in this queue, or null if this queue is sorted according to the natural ordering of its elements.
Comparator<? super E>	SortedSet.comparator() Returns the comparator used to order the elements in this set, or null if this set uses the natural ordering of its elements.
Comparator<? super K>	TreeMap.comparator()
Comparator<? super K>	SortedMap.comparator() Returns the comparator used to order the keys in this map, or null if this map uses the natural ordering of its keys.
static <T,U extends Comparable<? super U>> Comparator<T>	Comparator.comparing(Function<? super T,? extends U> keyExtractor) Accepts a function that extracts a Comparable sort key from a type T, and returns a Comparator<T> that compares by that sort key.
static <T,U> Comparator<T>	Comparator.comparing(Function<? super T,? extends U> keyExtractor, Comparator<? super U> keyComparator) Accepts a function that extracts a sort key from a type T, and returns a Comparator<T> that compares by that sort key using the specified Comparator.
static <K extends Comparable<? super K>,V> Comparator<Map.Entry<K,V>>	Map.Entry.comparingByKey() Returns a comparator that compares Map.Entry in natural order on key.
static <K,V> Comparator<Map.Entry<K,V>>	Map.Entry.comparingByKey(Comparator<? super K> cmp) Returns a comparator that compares Map.Entry by key using the given Comparator.
static <K,V extends Comparable<? super V>> Comparator<Map.Entry<K,V>>	Map.Entry.comparingByValue() Returns a comparator that compares Map.Entry in natural order on value.
static <K,V> Comparator<Map.Entry<K,V>>	Map.Entry.comparingByValue(Comparator<? super V> cmp) Returns a comparator that compares Map.Entry by value using the given Comparator.
static <T> Comparator<T>	Comparator.comparingDouble(ToDoubleFunction<? super T> keyExtractor) Accepts a function that extracts a double sort key from a type T, and returns a Comparator<T> that compares by that sort key.
static <T> Comparator<T>	Comparator.comparingInt(ToIntFunction<? super T> keyExtractor) Accepts a function that extracts an int sort key from a type T, and returns a Comparator<T> that compares by that sort key.
static <T> Comparator<T>	Comparator.comparingLong(ToLongFunction<? super T> keyExtractor) Accepts a function that extracts a long sort key from a type T, and returns a Comparator<T> that compares by that sort key.
default Comparator<? super T>	Spliterator.getComparator() If this Spliterator's source is Spliterator.SORTED by a Comparator, returns that Comparator.
static <T extends Comparable<? super T>> Comparator<T>	Comparator.naturalOrder() Returns a comparator that compares Comparable objects in natural order.
static <T> Comparator<T>	Comparator.nullsFirst(Comparator<? super T> comparator) Returns a null-friendly comparator that considers null to be less than non-null.
static <T> Comparator<T>	Comparator.nullsLast(Comparator<? super T> comparator) Returns a null-friendly comparator that considers null to be greater than non-null.
default Comparator<T>	Comparator.reversed() Returns a comparator that imposes the reverse ordering of this comparator.
static <T> Comparator<T>	Collections.reverseOrder() Returns a comparator that imposes the reverse of the natural ordering on a collection of objects that implement the Comparable interface.
static <T extends Comparable<? super T>> Comparator<T>	Comparator.reverseOrder() Returns a comparator that imposes the reverse of the natural ordering.
static <T> Comparator<T>	Collections.reverseOrder(Comparator<T> cmp) Returns a comparator that imposes the reverse ordering of the specified comparator.
default Comparator<T>	Comparator.thenComparing(Comparator<? super T> other) Returns a lexicographic-order comparator with another comparator.
default <U extends Comparable<? super U>> Comparator<T>	Comparator.thenComparing(Function<? super T,? extends U> keyExtractor) Returns a lexicographic-order comparator with a function that extracts a Comparable sort key.
default <U> Comparator<T>	Comparator.thenComparing(Function<? super T,? extends U> keyExtractor, Comparator<? super U> keyComparator) Returns a lexicographic-order comparator with a function that extracts a key to be compared with the given Comparator.
default Comparator<T>	Comparator.thenComparingDouble(ToDoubleFunction<? super T> keyExtractor) Returns a lexicographic-order comparator with a function that extracts a double sort key.
default Comparator<T>	Comparator.thenComparingInt(ToIntFunction<? super T> keyExtractor) Returns a lexicographic-order comparator with a function that extracts a int sort key.
default Comparator<T>	Comparator.thenComparingLong(ToLongFunction<? super T> keyExtractor) Returns a lexicographic-order comparator with a function that extracts a long sort key.

Methods in java.util with parameters of type Comparator

Modifier and Type	Method and Description
static <T> int	Collections.binarySearch(List<? extends T> list, T key, Comparator<? super T> c) Searches the specified list for the specified object using the binary search algorithm.
static <T> int	Arrays.binarySearch(T[] a, int fromIndex, int toIndex, T key, Comparator<? super T> c) Searches a range of the specified array for the specified object using the binary search algorithm.
static <T> int	Arrays.binarySearch(T[] a, T key, Comparator<? super T> c) Searches the specified array for the specified object using the binary search algorithm.
static <T> int	Objects.compare(T a, T b, Comparator<? super T> c) Returns 0 if the arguments are identical and c.compare(a, b) otherwise.
static <T,U> Comparator<T>	Comparator.comparing(Function<? super T,? extends U> keyExtractor, Comparator<? super U> keyComparator) Accepts a function that extracts a sort key from a type T, and returns a Comparator<T> that compares by that sort key using the specified Comparator.
static <K,V> Comparator<Map.Entry<K,V>>	Map.Entry.comparingByKey(Comparator<? super K> cmp) Returns a comparator that compares Map.Entry by key using the given Comparator.
static <K,V> Comparator<Map.Entry<K,V>>	Map.Entry.comparingByValue(Comparator<? super V> cmp) Returns a comparator that compares Map.Entry by value using the given Comparator.
static <T> T	Collections.max(Collection<? extends T> coll, Comparator<? super T> comp) Returns the maximum element of the given collection, according to the order induced by the specified comparator.
static <T> T	Collections.min(Collection<? extends T> coll, Comparator<? super T> comp) Returns the minimum element of the given collection, according to the order induced by the specified comparator.
static <T> Comparator<T>	Comparator.nullsFirst(Comparator<? super T> comparator) Returns a null-friendly comparator that considers null to be less than non-null.
static <T> Comparator<T>	Comparator.nullsLast(Comparator<? super T> comparator) Returns a null-friendly comparator that considers null to be greater than non-null.
static <T> void	Arrays.parallelSort(T[] a, Comparator<? super T> cmp) Sorts the specified array of objects according to the order induced by the specified comparator.
static <T> void	Arrays.parallelSort(T[] a, int fromIndex, int toIndex, Comparator<? super T> cmp) Sorts the specified range of the specified array of objects according to the order induced by the specified comparator.
static <T> Comparator<T>	Collections.reverseOrder(Comparator<T> cmp) Returns a comparator that imposes the reverse ordering of the specified comparator.
void	ArrayList.sort(Comparator<? super E> c)
void	Vector.sort(Comparator<? super E> c)
default void	List.sort(Comparator<? super E> c) Sorts this list according to the order induced by the specified Comparator.
static <T> void	Collections.sort(List<T> list, Comparator<? super T> c) Sorts the specified list according to the order induced by the specified comparator.
static <T> void	Arrays.sort(T[] a, Comparator<? super T> c) Sorts the specified array of objects according to the order induced by the specified comparator.
static <T> void	Arrays.sort(T[] a, int fromIndex, int toIndex, Comparator<? super T> c) Sorts the specified range of the specified array of objects according to the order induced by the specified comparator.
default Comparator<T>	Comparator.thenComparing(Comparator<? super T> other) Returns a lexicographic-order comparator with another comparator.
default <U> Comparator<T>	Comparator.thenComparing(Function<? super T,? extends U> keyExtractor, Comparator<? super U> keyComparator) Returns a lexicographic-order comparator with a function that extracts a key to be compared with the given Comparator.

Constructors in java.util with parameters of type Comparator

Constructor and Description
PriorityQueue(Comparator<? super E> comparator) Creates a PriorityQueue with the default initial capacity and whose elements are ordered according to the specified comparator.
PriorityQueue(int initialCapacity, Comparator<? super E> comparator) Creates a PriorityQueue with the specified initial capacity that orders its elements according to the specified comparator.
TreeMap(Comparator<? super K> comparator) Constructs a new, empty tree map, ordered according to the given comparator.
TreeSet(Comparator<? super E> comparator) Constructs a new, empty tree set, sorted according to the specified comparator.

Uses of Comparator in java.util.concurrent

Methods in java.util.concurrent that return Comparator

Modifier and Type	Method and Description
Comparator<? super E>	PriorityBlockingQueue.comparator() Returns the comparator used to order the elements in this queue, or null if this queue uses the natural ordering of its elements.
Comparator<? super E>	ConcurrentSkipListSet.comparator()
Comparator<? super K>	ConcurrentSkipListMap.comparator()

Methods in java.util.concurrent with parameters of type Comparator

Modifier and Type	Method and Description
void	CopyOnWriteArrayList.sort(Comparator<? super E> c)

Constructors in java.util.concurrent with parameters of type Comparator

Constructor and Description
ConcurrentSkipListMap(Comparator<? super K> comparator) Constructs a new, empty map, sorted according to the specified comparator.
ConcurrentSkipListSet(Comparator<? super E> comparator) Constructs a new, empty set that orders its elements according to the specified comparator.
PriorityBlockingQueue(int initialCapacity, Comparator<? super E> comparator) Creates a PriorityBlockingQueue with the specified initial capacity that orders its elements according to the specified comparator.

Uses of Comparator in java.util.function

Methods in java.util.function with parameters of type Comparator

Modifier and Type	Method and Description
static <T> BinaryOperator<T>	BinaryOperator.maxBy(Comparator<? super T> comparator) Returns a BinaryOperator which returns the greater of two elements according to the specified Comparator.
static <T> BinaryOperator<T>	BinaryOperator.minBy(Comparator<? super T> comparator) Returns a BinaryOperator which returns the lesser of two elements according to the specified Comparator.

Uses of Comparator in java.util.stream

Methods in java.util.stream with parameters of type Comparator

Modifier and Type	Method and Description
Optional<T>	Stream.max(Comparator<? super T> comparator) Returns the maximum element of this stream according to the provided Comparator.
static <T> Collector<T,?,Optional<T>>	Collectors.maxBy(Comparator<? super T> comparator) Returns a Collector that produces the maximal element according to a given Comparator, described as an Optional<T>.
Optional<T>	Stream.min(Comparator<? super T> comparator) Returns the minimum element of this stream according to the provided Comparator.
static <T> Collector<T,?,Optional<T>>	Collectors.minBy(Comparator<? super T> comparator) Returns a Collector that produces the minimal element according to a given Comparator, described as an Optional<T>.
Stream<T>	Stream.sorted(Comparator<? super T> comparator) Returns a stream consisting of the elements of this stream, sorted according to the provided Comparator.

Uses of Comparator in javax.swing

Methods in javax.swing that return Comparator

Modifier and Type	Method and Description
protected Comparator<? super Component>	SortingFocusTraversalPolicy.getComparator() Returns the Comparator which will be used to sort the Components in a focus traversal cycle.
Comparator<?>	DefaultRowSorter.getComparator(int column) Returns the Comparator for the specified column.

Methods in javax.swing with parameters of type Comparator

Modifier and Type	Method and Description
protected void	SortingFocusTraversalPolicy.setComparator(Comparator<? super Component> comparator) Sets the Comparator which will be used to sort the Components in a focus traversal cycle.
void	DefaultRowSorter.setComparator(int column, Comparator<?> comparator) Sets the Comparator to use when sorting the specified column.

Constructors in javax.swing with parameters of type Comparator

Constructor and Description
SortingFocusTraversalPolicy(Comparator<? super Component> comparator) Constructs a SortingFocusTraversalPolicy with the specified Comparator.

Uses of Comparator in javax.swing.table

Methods in javax.swing.table that return Comparator

Modifier and Type	Method and Description
Comparator<?>	TableRowSorter.getComparator(int column) Returns the Comparator for the specified column.