What are the key features of Java Collections Framework?

What are the key features of the Java Collections Framework?

The Java Collections Framework provides a set of classes and interfaces for storing and manipulating groups of data. Key features include: 1. Unified architecture: All collections implement the Collection interface. 2. Data structures: Includes lists, sets, maps, and queues. 3. Algorithms: Provides methods for sorting and searching. 4. Flexibility: Supports both mutable and immutable collections.

Can you explain the difference between List and Set?

Certainly! A List allows duplicate elements and maintains the order of insertion, while a Set does not allow duplicates and does not guarantee any specific order.

What are some common implementations of the Map interface?

Common implementations of the Map interface include HashMap, TreeMap, and LinkedHashMap. HashMap is fast and allows null values, TreeMap sorts the keys, and LinkedHashMap maintains the insertion order.

How do I iterate over a collection in Java?

You can iterate over a collection using a for-each loop, an Iterator, or Java Streams. For example, using a for-each loop: for (ElementType element : collection) { // process element }.