Collection Interface in Java | Collection Framework | Collection Interface Methods | Java Tutorial

Veröffentlicht am: 20 Juni 2022
auf dem Kanal: Krishna Sakinala (Automation Testing)

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Collection:

It is the parent/root interface in collections framework.
Collection interface defines the most common methods which are applicable for any collection object.

Methods defined in Collection Interface:

boolean add(Object o): To add single object to collection.
boolean addAll(Collection c): To add group of objects to collection.
boolean remove(Object o): To remove single object from collection.
boolean removeAll(Collection c): To remove group of objects from collection.
boolean retainAll(Collection c): To remove all objects except those present in c.
void clear(): To clear all the objects from the collection.
boolean contains(Object o): To verify collection contains mentioned object or not?
boolean containsAll(Collection c): To verify collection contains group of objects or not?
boolean isEmpty(): To verify collection is empty or not?
int size(): To get the size(number of objects) of the collection.
Object[] toArray(): Convert collection to an Array.
Iterator iterator(): To get all the elements one by one from the collection.

No concrete class available which implements Collection interface directly.
No direct method available in collection interface to get the objects.

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