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What is the Collection interface in Java?
The collection interface is the foundation upon which the collection framework is built. It declares the core methods that all collections will have.
A class cast exception is generated when objects are incompatible with another, Such as when an attempt is made to add an incompatible object to a collection. The following are methods defined in the collection interface.
Boolean add (object obj):
Adds an object to the invoking collection. Returns true if the object was added to the collection. Return false if the object is already a member of the collection, or if the collection does not allow duplicates.
Boolean add all (Collection c):
Adds all the elements of c to the invoking collection, Return true if the elements were added otherwise, return false.
Void clear ():
This removes all the elements from the invoking collection.
Boolean contains (object obj):
Return true if the object is an element of the invoking collection, otherwise, return false.
Boolean contains all (Collection c):
Return true if the invoking collections contain all elements of C, otherwise, return false.
Boolean equals (Object obj):
Returns true if the invoking collection and object are equal, otherwise, return false.
Int hash code ():
This returns the hash code for the invoking collection.
Boolean is empty ():
Returns true if the invoking collection is empty, otherwise, return false.
Boolean remove:
Remove one instance of the object from the invoking collection and returns true if the elements were removed, else return false.
Boolean removes all (Collection c):
Removes all the elements from the invoking collection except those in c. Returns true if the elements were removed, otherwise returns false.
Boolean retain all:
Removes all elements from the invoking collection except those in c. return true, if the elements were removed otherwise, return false.
Int size ():
Returns the number of elements held in the invoking collection.
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