Java Collections API Design FAQ

This document answers frequently asked questions concerning the design of the Java collections framework. It is derived from the large volume of traffic on the collections-comments alias. It serves as a design rationale for the collections framework.

This article is must read for Java developers who wants know why java have built some of the design in particular way and have doubts and concerns. This will be helpful in their job and interview as well.

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Lets Dive into Common FAQS,

Core Interfaces — General Questions

Why don’t you support immutability directly in the core collection interfaces so that you can do away with optional operations (and UnsupportedOperationException)?