Greetings!
Collection interface is the base interface for most of the classes in Collection Framework. It mainly contains methods for add, remove and iteration.
Other than that this contains a lot of common utility methods.
Java 8 has introduced new default methods to convert the Collection into a stream.
Collection interface is the base interface for most of the classes in Collection Framework. It mainly contains methods for add, remove and iteration.
public interface Collection<E> {
boolean add(E element);
Iterator<E> iterator();
boolean remove(Object o);
// ....
}
Other than that this contains a lot of common utility methods.
int size()
boolean isEmpty()
boolean contains(Object obj)
boolean containsAll(Collection<?> c)
boolean equals(Object other)
boolean addAll(Collection<? extends E> from)
boolean remove(Object obj)
boolean removeAll(Collection<?> c)
void clear()
boolean retainAll(Collection<?> c)
Object[] toArray()
<T> T[] toArray(T[] arrayToFill)
Java 8 has introduced new default methods to convert the Collection into a stream.
default Stream<E> stream()
default Stream<E> parallelStream()
default boolean removeIf(Predicate<? super E> filter)
- There is no concrete implementation of Collection interface. Instead it has several sub interfaces to handle different kind of Collections.
- Because most of the utility methods are common, there is partially implemented AbstractCollection that other implementation can extend. (this can be removed with Java 8 default methods)
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