Java Key Concepts

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Subpages consolidates the questions on foundational and intermediate Java topics such as:

• Object-Oriented Programming principles (Inheritance, Encapsulation, Polymorphism, Abstraction).

• Core APIs: Collections, Streams, Exceptions, Concurrency utilities.

• JVM internals, garbage collection, memory management.

• Java 8+ features: Lambdas, Functional Interfaces, Optionals, and Stream pipelines.