What are the key features of Java Collections?

What are the key features of Java Collections?

Java Collections provide a framework for storing and manipulating groups of objects. Key features include: 1. Interfaces: Such as List, Set, and Map. 2. Implementations: Like ArrayList, HashSet, and HashMap. 3. Algorithms: Methods for sorting and searching. 4. Synchronization: Support for thread-safe collections. 5. Generics: Type safety for collections.

Can you explain the difference between List and Set?

Sure! 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 is the purpose of the Map interface?

The Map interface represents a collection of key-value pairs, where each key is unique. It allows for efficient retrieval, insertion, and deletion of values based on their keys.

How do I sort a List in Java?

You can sort a List in Java using the Collections.sort() method. For example: Collections.sort(myList); This will sort the list in natural order.

Are there any performance considerations I should be aware of?

Yes, different collections have different performance characteristics. For example, ArrayList provides fast random access, while LinkedList is better for insertions and deletions. Always choose the right collection based on your use case.