Uses of Interface
java.util.Comparator

Packages that use Comparator

Package	Description
java.lang
java.util

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.util

Methods in java.util that return Comparator

Modifier and Type	Method and Description
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.
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 extends Comparable<? super T>> Comparator<T>	Comparator.reverseOrder() Returns a comparator that imposes the reverse of the natural ordering.
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	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> 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 void	List.sort(Comparator<? super E> c) Sorts this list 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.