ImmutableCollection<T>, ImmutableSetIterable<T>, InternalIterable<T>, java.lang.Iterable<T>, RichIterable<T>, SetIterable<T>, UnsortedSetIterable<T>AbstractImmutableSetpublic interface ImmutableSet<T> extends UnsortedSetIterable<T>, ImmutableSetIterable<T>
MutableSet. MutableSet.toImmutable() will
 give you an appropriately trimmed implementation of ImmutableSet.  All ImmutableSet implementations must implement
 the java.util.Set interface so they can satisfy the equals() contract and be compared against other set structures
 like UnifiedSet or HashSet.| Modifier and Type | Method | Description | 
|---|---|---|
| java.util.Set<T> | castToSet() | |
| <V> ImmutableSet<V> | collect(Function<? super T,? extends V> function) | Returns a new collection with the results of applying the specified function on each element of the source
 collection. | 
| ImmutableBooleanSet | collectBoolean(BooleanFunction<? super T> booleanFunction) | Returns a new primitive  booleaniterable with the results of applying the specified function on each element
 of the source collection. | 
| ImmutableByteSet | collectByte(ByteFunction<? super T> byteFunction) | Returns a new primitive  byteiterable with the results of applying the specified function on each element
 of the source collection. | 
| ImmutableCharSet | collectChar(CharFunction<? super T> charFunction) | Returns a new primitive  chariterable with the results of applying the specified function on each element
 of the source collection. | 
| ImmutableDoubleSet | collectDouble(DoubleFunction<? super T> doubleFunction) | Returns a new primitive  doubleiterable with the results of applying the specified function on each element
 of the source collection. | 
| ImmutableFloatSet | collectFloat(FloatFunction<? super T> floatFunction) | Returns a new primitive  floatiterable with the results of applying the specified function on each element
 of the source collection. | 
| <V> ImmutableSet<V> | collectIf(Predicate<? super T> predicate,
         Function<? super T,? extends V> function) | Returns a new collection with the results of applying the specified function on each element of the source
 collection, but only for those elements which return true upon evaluation of the predicate. | 
| ImmutableIntSet | collectInt(IntFunction<? super T> intFunction) | Returns a new primitive  intiterable with the results of applying the specified function on each element
 of the source collection. | 
| ImmutableLongSet | collectLong(LongFunction<? super T> longFunction) | Returns a new primitive  longiterable with the results of applying the specified function on each element
 of the source collection. | 
| ImmutableShortSet | collectShort(ShortFunction<? super T> shortFunction) | Returns a new primitive  shortiterable with the results of applying the specified function on each element
 of the source collection. | 
| <P,V> ImmutableSet<V> | collectWith(Function2<? super T,? super P,? extends V> function,
           P parameter) | Same as  RichIterable.collect(Function)with aFunction2and specified parameter which is passed to the block. | 
| ImmutableSet<T> | difference(SetIterable<? extends T> subtrahendSet) | Returns the set of all members of  thisthat are not members ofsubtrahendSet. | 
| <V> ImmutableSet<V> | flatCollect(Function<? super T,? extends java.lang.Iterable<V>> function) | flatCollectis a special case ofRichIterable.collect(Function). | 
| default <P,V> ImmutableSet<V> | flatCollectWith(Function2<? super T,? super P,? extends java.lang.Iterable<V>> function,
               P parameter) | |
| <V> ImmutableSetMultimap<V,T> | groupBy(Function<? super T,? extends V> function) | For each element of the iterable, the function is evaluated and the results of these evaluations are collected
 into a new multimap, where the transformed value is the key and the original values are added to the same (or similar)
 species of collection as the source iterable. | 
| <V> ImmutableSetMultimap<V,T> | groupByEach(Function<? super T,? extends java.lang.Iterable<V>> function) | Similar to  RichIterable.groupBy(Function), except the result of evaluating function will return a collection of keys
 for each value. | 
| ImmutableSet<T> | intersect(SetIterable<? extends T> set) | Returns the set of all objects that are members of both  thisandset. | 
| ImmutableSet<T> | newWith(T element) | This method is similar to the  withmethod inMutableCollectionwith the difference that a new copy of this collection with the element appended will be returned. | 
| ImmutableSet<T> | newWithAll(java.lang.Iterable<? extends T> elements) | This method is similar to the  withAllmethod inMutableCollectionwith the difference that a new copy of this collection with the elements appended will be returned. | 
| ImmutableSet<T> | newWithout(T element) | This method is similar to the  withoutmethod inMutableCollectionwith the difference that a new copy of this collection with the element removed will be returned. | 
| ImmutableSet<T> | newWithoutAll(java.lang.Iterable<? extends T> elements) | This method is similar to the  withoutAllmethod inMutableCollectionwith the difference that a new copy of this collection with the elements removed will be returned. | 
| PartitionImmutableSet<T> | partition(Predicate<? super T> predicate) | Filters a collection into a PartitionedIterable based on the evaluation of the predicate. | 
| <P> PartitionImmutableSet<T> | partitionWith(Predicate2<? super T,? super P> predicate,
             P parameter) | Filters a collection into a PartitionIterable based on the evaluation of the predicate. | 
| ImmutableSet<UnsortedSetIterable<T>> | powerSet() | Returns the set whose members are all possible subsets of  this. | 
| ImmutableSet<T> | reject(Predicate<? super T> predicate) | Returns all elements of the source collection that return false when evaluating of the predicate. | 
| <P> ImmutableSet<T> | rejectWith(Predicate2<? super T,? super P> predicate,
          P parameter) | Similar to  RichIterable.reject(Predicate), except with an evaluation parameter for the second generic argument inPredicate2. | 
| ImmutableSet<T> | select(Predicate<? super T> predicate) | Returns all elements of the source collection that return true when evaluating the predicate. | 
| <S> ImmutableSet<S> | selectInstancesOf(java.lang.Class<S> clazz) | Returns all elements of the source collection that are instances of the Class  clazz. | 
| <P> ImmutableSet<T> | selectWith(Predicate2<? super T,? super P> predicate,
          P parameter) | Similar to  RichIterable.select(Predicate), except with an evaluation parameter for the second generic argument inPredicate2. | 
| ImmutableSet<T> | symmetricDifference(SetIterable<? extends T> setB) | Returns the set of all objects that are a member of exactly one of  thisandsetB(elements which
 are in one of the sets, but not in both). | 
| ImmutableSet<T> | tap(Procedure<? super T> procedure) | Executes the Procedure for each element in the iterable and returns  this. | 
| ImmutableSet<T> | union(SetIterable<? extends T> set) | Returns the set of all objects that are a member of  thisorsetor both. | 
| <S> ImmutableSet<Pair<T,S>> | zip(java.lang.Iterable<S> that) | Deprecated. 
 in 6.0. Use  OrderedIterable.zip(Iterable)instead. | 
| ImmutableSet<Pair<T,java.lang.Integer>> | zipWithIndex() | Deprecated. 
 in 6.0. Use  OrderedIterable.zipWithIndex()instead. | 
aggregateBy, aggregateInPlaceBy, castToCollection, countBy, countByWith, groupByUniqueKey, parallelStream, spliterator, stream, sumByDouble, sumByFloat, sumByInt, sumByLongforEach, forEach, forEachWith, forEachWithIndexallSatisfy, allSatisfyWith, anySatisfy, anySatisfyWith, appendString, appendString, appendString, asLazy, chunk, collect, collectBoolean, collectByte, collectChar, collectDouble, collectFloat, collectIf, collectInt, collectLong, collectShort, collectWith, contains, containsAll, containsAllArguments, containsAllIterable, count, countBy, countByWith, countWith, detect, detectIfNone, detectOptional, detectWith, detectWithIfNone, detectWithOptional, each, flatCollect, flatCollectWith, getFirst, getLast, getOnly, groupBy, groupByEach, groupByUniqueKey, injectInto, injectInto, injectInto, injectInto, injectInto, into, isEmpty, makeString, makeString, makeString, max, max, maxBy, maxByOptional, maxOptional, maxOptional, min, min, minBy, minByOptional, minOptional, minOptional, noneSatisfy, noneSatisfyWith, notEmpty, reduce, reduceInPlace, reduceInPlace, reject, rejectWith, select, selectWith, size, summarizeDouble, summarizeFloat, summarizeInt, summarizeLong, sumOfDouble, sumOfFloat, sumOfInt, sumOfLong, toArray, toArray, toBag, toList, toMap, toSet, toSortedBag, toSortedBag, toSortedBagBy, toSortedList, toSortedList, toSortedListBy, toSortedMap, toSortedMap, toSortedMapBy, toSortedSet, toSortedSet, toSortedSetBy, toString, zip, zipWithIndexcartesianProduct, differenceInto, equals, hashCode, intersectInto, isProperSubsetOf, isSubsetOf, symmetricDifferenceInto, unionIntoasParallel, toImmutableImmutableSet<T> newWith(T element)
ImmutableCollectionwith method in MutableCollection
 with the difference that a new copy of this collection with the element appended will be returned.newWith in interface ImmutableCollection<T>ImmutableSet<T> newWithout(T element)
ImmutableCollectionwithout method in MutableCollection
 with the difference that a new copy of this collection with the element removed will be returned.newWithout in interface ImmutableCollection<T>ImmutableSet<T> newWithAll(java.lang.Iterable<? extends T> elements)
ImmutableCollectionwithAll method in MutableCollection
 with the difference that a new copy of this collection with the elements appended will be returned.newWithAll in interface ImmutableCollection<T>ImmutableSet<T> newWithoutAll(java.lang.Iterable<? extends T> elements)
ImmutableCollectionwithoutAll method in MutableCollection
 with the difference that a new copy of this collection with the elements removed will be returned.newWithoutAll in interface ImmutableCollection<T>ImmutableSet<T> tap(Procedure<? super T> procedure)
RichIterablethis.
 Example using a Java 8 lambda expression:
 RichIterable<Person> tapped =
     people.tap(person -> LOGGER.info(person.getName()));
 
 Example using an anonymous inner class:
 RichIterable<Person> tapped =
     people.tap(new Procedure<Person>()
     {
         public void value(Person person)
         {
             LOGGER.info(person.getName());
         }
     });
 tap in interface ImmutableCollection<T>tap in interface ImmutableSetIterable<T>tap in interface RichIterable<T>tap in interface SetIterable<T>tap in interface UnsortedSetIterable<T>RichIterable.each(Procedure), 
InternalIterable.forEach(Procedure)ImmutableSet<T> select(Predicate<? super T> predicate)
RichIterableExample using a Java 8 lambda expression:
 RichIterable<Person> selected =
     people.select(person -> person.getAddress().getCity().equals("London"));
 
 Example using an anonymous inner class:
 RichIterable<Person> selected =
     people.select(new Predicate<Person>()
     {
         public boolean accept(Person person)
         {
             return person.getAddress().getCity().equals("London");
         }
     });select in interface ImmutableCollection<T>select in interface ImmutableSetIterable<T>select in interface RichIterable<T>select in interface SetIterable<T>select in interface UnsortedSetIterable<T><P> ImmutableSet<T> selectWith(Predicate2<? super T,? super P> predicate, P parameter)
RichIterableRichIterable.select(Predicate), except with an evaluation parameter for the second generic argument in Predicate2.
 
 E.g. return a Collection of Person elements where the person has an age greater than or equal to 18 years
 
Example using a Java 8 lambda expression:
 RichIterable<Person> selected =
     people.selectWith((Person person, Integer age) -> person.getAge() >= age, Integer.valueOf(18));
 
 Example using an anonymous inner class:
 RichIterable<Person> selected =
     people.selectWith(new Predicate2<Person, Integer>()
     {
         public boolean accept(Person person, Integer age)
         {
             return person.getAge() >= age;
         }
     }, Integer.valueOf(18));
 selectWith in interface ImmutableCollection<T>selectWith in interface ImmutableSetIterable<T>selectWith in interface RichIterable<T>selectWith in interface SetIterable<T>selectWith in interface UnsortedSetIterable<T>predicate - a Predicate2 to use as the select criteriaparameter - a parameter to pass in for evaluation of the second argument P in predicateRichIterable.select(Predicate)ImmutableSet<T> reject(Predicate<? super T> predicate)
RichIterableExample using a Java 8 lambda expression:
 RichIterable<Person> rejected =
     people.reject(person -> person.person.getLastName().equals("Smith"));
 
 Example using an anonymous inner class:
 RichIterable<Person> rejected =
     people.reject(new Predicate<Person>()
     {
         public boolean accept(Person person)
         {
             return person.person.getLastName().equals("Smith");
         }
     });
 reject in interface ImmutableCollection<T>reject in interface ImmutableSetIterable<T>reject in interface RichIterable<T>reject in interface SetIterable<T>reject in interface UnsortedSetIterable<T>predicate - a Predicate to use as the reject criteriaPredicate.accept(Object) method to evaluate to false<P> ImmutableSet<T> rejectWith(Predicate2<? super T,? super P> predicate, P parameter)
RichIterableRichIterable.reject(Predicate), except with an evaluation parameter for the second generic argument in Predicate2.
 
 E.g. return a Collection of Person elements where the person has an age greater than or equal to 18 years
 
Example using a Java 8 lambda expression:
 RichIterable<Person> rejected =
     people.rejectWith((Person person, Integer age) -> person.getAge() < age, Integer.valueOf(18));
 
 Example using an anonymous inner class:
 MutableList<Person> rejected =
     people.rejectWith(new Predicate2<Person, Integer>()
     {
         public boolean accept(Person person, Integer age)
         {
             return person.getAge() < age;
         }
     }, Integer.valueOf(18));
 rejectWith in interface ImmutableCollection<T>rejectWith in interface ImmutableSetIterable<T>rejectWith in interface RichIterable<T>rejectWith in interface SetIterable<T>rejectWith in interface UnsortedSetIterable<T>predicate - a Predicate2 to use as the select criteriaparameter - a parameter to pass in for evaluation of the second argument P in predicateRichIterable.select(Predicate)PartitionImmutableSet<T> partition(Predicate<? super T> predicate)
RichIterableExample using a Java 8 lambda expression:
 PartitionIterable<Person> newYorkersAndNonNewYorkers =
     people.partition(person -> person.getAddress().getState().getName().equals("New York"));
 
 Example using an anonymous inner class:
 PartitionIterable<Person> newYorkersAndNonNewYorkers =
     people.partition(new Predicate<Person>()
     {
         public boolean accept(Person person)
         {
             return person.getAddress().getState().getName().equals("New York");
         }
     });
 partition in interface ImmutableCollection<T>partition in interface ImmutableSetIterable<T>partition in interface RichIterable<T>partition in interface SetIterable<T><P> PartitionImmutableSet<T> partitionWith(Predicate2<? super T,? super P> predicate, P parameter)
RichIterableExample using a Java 8 lambda expression:
 PartitionIterable<Person>> newYorkersAndNonNewYorkers =
     people.partitionWith((Person person, String state) -> person.getAddress().getState().getName().equals(state), "New York");
 
 Example using an anonymous inner class:
 PartitionIterable<Person>> newYorkersAndNonNewYorkers =
     people.partitionWith(new Predicate2<Person, String>()
     {
         public boolean accept(Person person, String state)
         {
             return person.getAddress().getState().getName().equals(state);
         }
     }, "New York");
 partitionWith in interface ImmutableCollection<T>partitionWith in interface ImmutableSetIterable<T>partitionWith in interface RichIterable<T>partitionWith in interface SetIterable<T><S> ImmutableSet<S> selectInstancesOf(java.lang.Class<S> clazz)
RichIterableclazz.
 
 RichIterable<Integer> integers =
     List.mutable.with(new Integer(0), new Long(0L), new Double(0.0)).selectInstancesOf(Integer.class);
 selectInstancesOf in interface ImmutableCollection<T>selectInstancesOf in interface ImmutableSetIterable<T>selectInstancesOf in interface RichIterable<T>selectInstancesOf in interface SetIterable<T>selectInstancesOf in interface UnsortedSetIterable<T><V> ImmutableSet<V> collect(Function<? super T,? extends V> function)
RichIterableExample using a Java 8 lambda expression:
 RichIterable<String> names =
     people.collect(person -> person.getFirstName() + " " + person.getLastName());
 
 Example using an anonymous inner class:
 RichIterable<String> names =
     people.collect(new Function<Person, String>()
     {
         public String valueOf(Person person)
         {
             return person.getFirstName() + " " + person.getLastName();
         }
     });
 collect in interface ImmutableCollection<T>collect in interface RichIterable<T>collect in interface UnsortedSetIterable<T>ImmutableBooleanSet collectBoolean(BooleanFunction<? super T> booleanFunction)
RichIterableboolean iterable with the results of applying the specified function on each element
 of the source collection.  This method is also commonly called transform or map.
 Example using a Java 8 lambda expression:
 BooleanIterable licenses =
     people.collectBoolean(person -> person.hasDrivingLicense());
 
 Example using an anonymous inner class:
 BooleanIterable licenses =
     people.collectBoolean(new BooleanFunction<Person>()
     {
         public boolean booleanValueOf(Person person)
         {
             return person.hasDrivingLicense();
         }
     });
 collectBoolean in interface ImmutableCollection<T>collectBoolean in interface RichIterable<T>collectBoolean in interface UnsortedSetIterable<T>ImmutableByteSet collectByte(ByteFunction<? super T> byteFunction)
RichIterablebyte iterable with the results of applying the specified function on each element
 of the source collection.  This method is also commonly called transform or map.
 Example using a Java 8 lambda expression:
 ByteIterable bytes =
     people.collectByte(person -> person.getCode());
 
 Example using an anonymous inner class:
 ByteIterable bytes =
     people.collectByte(new ByteFunction<Person>()
     {
         public byte byteValueOf(Person person)
         {
             return person.getCode();
         }
     });
 collectByte in interface ImmutableCollection<T>collectByte in interface RichIterable<T>collectByte in interface UnsortedSetIterable<T>ImmutableCharSet collectChar(CharFunction<? super T> charFunction)
RichIterablechar iterable with the results of applying the specified function on each element
 of the source collection.  This method is also commonly called transform or map.
 Example using a Java 8 lambda expression:
 CharIterable chars =
     people.collectChar(person -> person.getMiddleInitial());
 
 Example using an anonymous inner class:
 CharIterable chars =
     people.collectChar(new CharFunction<Person>()
     {
         public char charValueOf(Person person)
         {
             return person.getMiddleInitial();
         }
     });
 collectChar in interface ImmutableCollection<T>collectChar in interface RichIterable<T>collectChar in interface UnsortedSetIterable<T>ImmutableDoubleSet collectDouble(DoubleFunction<? super T> doubleFunction)
RichIterabledouble iterable with the results of applying the specified function on each element
 of the source collection.  This method is also commonly called transform or map.
 Example using a Java 8 lambda expression:
 DoubleIterable doubles =
     people.collectDouble(person -> person.getMilesFromNorthPole());
 
 Example using an anonymous inner class:
 DoubleIterable doubles =
     people.collectDouble(new DoubleFunction<Person>()
     {
         public double doubleValueOf(Person person)
         {
             return person.getMilesFromNorthPole();
         }
     });
 collectDouble in interface ImmutableCollection<T>collectDouble in interface RichIterable<T>collectDouble in interface UnsortedSetIterable<T>ImmutableFloatSet collectFloat(FloatFunction<? super T> floatFunction)
RichIterablefloat iterable with the results of applying the specified function on each element
 of the source collection.  This method is also commonly called transform or map.
 Example using a Java 8 lambda expression:
 FloatIterable floats =
     people.collectFloat(person -> person.getHeightInInches());
 
 Example using an anonymous inner class:
 FloatIterable floats =
     people.collectFloat(new FloatFunction<Person>()
     {
         public float floatValueOf(Person person)
         {
             return person.getHeightInInches();
         }
     });
 collectFloat in interface ImmutableCollection<T>collectFloat in interface RichIterable<T>collectFloat in interface UnsortedSetIterable<T>ImmutableIntSet collectInt(IntFunction<? super T> intFunction)
RichIterableint iterable with the results of applying the specified function on each element
 of the source collection.  This method is also commonly called transform or map.
 Example using a Java 8 lambda expression:
 IntIterable ints =
     people.collectInt(person -> person.getAge());
 
 Example using an anonymous inner class:
 IntIterable ints =
     people.collectInt(new IntFunction<Person>()
     {
         public int intValueOf(Person person)
         {
             return person.getAge();
         }
     });
 collectInt in interface ImmutableCollection<T>collectInt in interface RichIterable<T>collectInt in interface UnsortedSetIterable<T>ImmutableLongSet collectLong(LongFunction<? super T> longFunction)
RichIterablelong iterable with the results of applying the specified function on each element
 of the source collection.  This method is also commonly called transform or map.
 Example using a Java 8 lambda expression:
 LongIterable longs =
     people.collectLong(person -> person.getGuid());
 
 Example using an anonymous inner class:
 LongIterable longs =
     people.collectLong(new LongFunction<Person>()
     {
         public long longValueOf(Person person)
         {
             return person.getGuid();
         }
     });
 collectLong in interface ImmutableCollection<T>collectLong in interface RichIterable<T>collectLong in interface UnsortedSetIterable<T>ImmutableShortSet collectShort(ShortFunction<? super T> shortFunction)
RichIterableshort iterable with the results of applying the specified function on each element
 of the source collection.  This method is also commonly called transform or map.
 Example using a Java 8 lambda expression:
 ShortIterable shorts =
     people.collectShort(person -> person.getNumberOfJunkMailItemsReceivedPerMonth());
 
 Example using an anonymous inner class:
 ShortIterable shorts =
     people.collectShort(new ShortFunction<Person>()
     {
         public short shortValueOf(Person person)
         {
             return person.getNumberOfJunkMailItemsReceivedPerMonth();
         }
     });
 collectShort in interface ImmutableCollection<T>collectShort in interface RichIterable<T>collectShort in interface UnsortedSetIterable<T><P,V> ImmutableSet<V> collectWith(Function2<? super T,? super P,? extends V> function, P parameter)
RichIterableRichIterable.collect(Function) with a Function2 and specified parameter which is passed to the block.
 Example using a Java 8 lambda expression:
 RichIterable<Integer> integers =
     Lists.mutable.with(1, 2, 3).collectWith((each, parameter) -> each + parameter, Integer.valueOf(1));
 
 Example using an anonymous inner class:
 Function2<Integer, Integer, Integer> addParameterFunction =
     new Function2<Integer, Integer, Integer>()
     {
         public Integer value(Integer each, Integer parameter)
         {
             return each + parameter;
         }
     };
 RichIterable<Integer> integers =
     Lists.mutable.with(1, 2, 3).collectWith(addParameterFunction, Integer.valueOf(1));
 collectWith in interface ImmutableCollection<T>collectWith in interface RichIterable<T>collectWith in interface UnsortedSetIterable<T>function - A Function2 to use as the collect transformation functionparameter - A parameter to pass in for evaluation of the second argument P in functionRichIterable that contains the transformed elements returned by Function2.value(Object, Object)RichIterable.collect(Function)<V> ImmutableSet<V> collectIf(Predicate<? super T> predicate, Function<? super T,? extends V> function)
RichIterableExample using a Java 8 lambda and method reference:
RichIterable<String> strings = Lists.mutable.with(1, 2, 3).collectIf(e -> e != null, Object::toString);
Example using Predicates factory:
RichIterable<String> strings = Lists.mutable.with(1, 2, 3).collectIf(Predicates.notNull(), Functions.getToString());
collectIf in interface ImmutableCollection<T>collectIf in interface RichIterable<T>collectIf in interface UnsortedSetIterable<T><V> ImmutableSet<V> flatCollect(Function<? super T,? extends java.lang.Iterable<V>> function)
RichIterableflatCollect is a special case of RichIterable.collect(Function). With collect, when the Function returns
 a collection, the result is a collection of collections. flatCollect outputs a single "flattened" collection
 instead.  This method is commonly called flatMap.
 
 Consider the following example where we have a Person class, and each Person has a list of Address objects.  Take the following Function:
 
Function<Person, List<Address>> addressFunction = Person::getAddresses; RichIterable<Person> people = ...;Using
collect returns a collection of collections of addresses.
 RichIterable<List<Address>> addresses = people.collect(addressFunction);Using
flatCollect returns a single flattened list of addresses.
 RichIterable<Address> addresses = people.flatCollect(addressFunction);
flatCollect in interface ImmutableCollection<T>flatCollect in interface RichIterable<T>flatCollect in interface UnsortedSetIterable<T>function - The Function to applyfunctiondefault <P,V> ImmutableSet<V> flatCollectWith(Function2<? super T,? super P,? extends java.lang.Iterable<V>> function, P parameter)
flatCollectWith in interface ImmutableCollection<T>flatCollectWith in interface RichIterable<T>flatCollectWith in interface UnsortedSetIterable<T><V> ImmutableSetMultimap<V,T> groupBy(Function<? super T,? extends V> function)
RichIterableExample using a Java 8 method reference:
 Multimap<String, Person> peopleByLastName =
     people.groupBy(Person::getLastName);
 
 Example using an anonymous inner class:
 Multimap<String, Person> peopleByLastName =
     people.groupBy(new Function<Person, String>()
     {
         public String valueOf(Person person)
         {
             return person.getLastName();
         }
     });
 groupBy in interface ImmutableCollection<T>groupBy in interface ImmutableSetIterable<T>groupBy in interface RichIterable<T>groupBy in interface UnsortedSetIterable<T><V> ImmutableSetMultimap<V,T> groupByEach(Function<? super T,? extends java.lang.Iterable<V>> function)
RichIterableRichIterable.groupBy(Function), except the result of evaluating function will return a collection of keys
 for each value.groupByEach in interface ImmutableCollection<T>groupByEach in interface ImmutableSetIterable<T>groupByEach in interface RichIterable<T>groupByEach in interface UnsortedSetIterable<T>@Deprecated <S> ImmutableSet<Pair<T,S>> zip(java.lang.Iterable<S> that)
OrderedIterable.zip(Iterable) instead.RichIterableRichIterable formed from this RichIterable and another RichIterable by
 combining corresponding elements in pairs. If one of the two RichIterables is longer than the other, its
 remaining elements are ignored.zip in interface ImmutableCollection<T>zip in interface RichIterable<T>zip in interface UnsortedSetIterable<T>S - the type of the second half of the returned pairsthat - The RichIterable providing the second half of each result pairRichIterable containing pairs consisting of corresponding elements of this 
 RichIterable and that. The length of the returned RichIterable is the minimum of the lengths of
 this RichIterable and that.@Deprecated ImmutableSet<Pair<T,java.lang.Integer>> zipWithIndex()
OrderedIterable.zipWithIndex() instead.RichIterableRichIterable with its indices.zipWithIndex in interface ImmutableCollection<T>zipWithIndex in interface ImmutableSetIterable<T>zipWithIndex in interface RichIterable<T>zipWithIndex in interface SetIterable<T>zipWithIndex in interface UnsortedSetIterable<T>RichIterable containing pairs consisting of all elements of this RichIterable
 paired with their index. Indices start at 0.RichIterable.zip(Iterable)java.util.Set<T> castToSet()
ImmutableSet<T> union(SetIterable<? extends T> set)
SetIterablethis or set or both. The union of [1, 2, 3]
 and [2, 3, 4] is the set [1, 2, 3, 4]. If equal elements appear in both sets, then the output will contain the
 copy from this.union in interface SetIterable<T>union in interface UnsortedSetIterable<T>ImmutableSet<T> intersect(SetIterable<? extends T> set)
SetIterablethis and set. The intersection of
 [1, 2, 3] and [2, 3, 4] is the set [2, 3]. The output will contain instances from this, not set.intersect in interface SetIterable<T>intersect in interface UnsortedSetIterable<T>ImmutableSet<T> difference(SetIterable<? extends T> subtrahendSet)
SetIterablethis that are not members of subtrahendSet. The difference of
 [1, 2, 3] and [2, 3, 4] is [1].difference in interface SetIterable<T>difference in interface UnsortedSetIterable<T>ImmutableSet<T> symmetricDifference(SetIterable<? extends T> setB)
SetIterablethis and setB (elements which
 are in one of the sets, but not in both). For instance, for the sets [1, 2, 3] and [2, 3, 4], the symmetric
 difference set is [1, 4] . It is the set difference of the union and the intersection.symmetricDifference in interface SetIterable<T>symmetricDifference in interface UnsortedSetIterable<T>ImmutableSet<UnsortedSetIterable<T>> powerSet()
UnsortedSetIterablethis. For example, the powerset of [1, 2] is
 [[], [1], [2], [1, 2]].powerSet in interface UnsortedSetIterable<T>Copyright © 2004–2018. All rights reserved.