The collection classes

The collection framework has the following classes for all occasions:

  • List: This is an ordered collection that supports indexed access to elements and allows duplicate elements
  • Set: This is a collection of elements in which each element can occur only once
  • Queue: This is a collection that can be manipulated at both ends
  • Map: This is a collection of key-value pairs where each element is accessible by a unique key

All of them define their own specific way to add or remove elements from collections. Let's discuss each of them.


The List class implements the Iterable interface and intensively uses the indexed order to iterate over elements in the collection. The List class can be of a fixed or variable length. A fixed-length list ...

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