Core Java Complete Notes By Durga Sir May 2026

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7.2 Stream API

• Intermediate Operations: filter(), map(), sorted()
• Terminal Operations: forEach(), collect(), reduce()
• Parallel Streams: parallelStream() for multicore processing.

• Encapsulation concept: Encapsulation is the concept of hiding internal implementation details and exposing only necessary information
• Access modifiers: Access modifiers like public, private, and protected are used to control access to class members

Conclusion

OOP is a programming paradigm that revolves around the concept of objects and classes. Here are the basic OOP concepts in Java: Encapsulation concept : Encapsulation is the concept of

5.4 Generics

• Type Safety: ArrayList<String> only accepts Strings. Compile-time safety.
• Wildcards: ? extends Number (Upper bound) vs ? super Integer (Lower bound). The PECS rule (Producer Extends, Consumer Super).

Control structures determine the flow of a program's execution. Here are the basic control structures in Java: