What Is a Java Collection Class

Java collection class is used exclusively with static methods that operate on or return collections. It inherits Object class. The important points about Java Collections class are: … Java Collection class throws a NullPointerException if the collections or class objects provided to them are null.

What is a collection class in Java?

Java collection class is used exclusively with static methods that operate on or return collections. It inherits Object class. The important points about Java Collections class are: … Java Collection class throws a NullPointerException if the collections or class objects provided to them are null.

What are the collection classes in Java explain with an example?

ClassDescriptionHashSetExtends AbstractSet for use with a hash table.LinkedHashSetExtends HashSet to allow insertion-order iterations.PriorityQueueExtends AbstractQueue to support a priority-based queue.TreeSetImplements a set stored in a tree. Extends AbstractSet.