Core Java Complete Notes By Durga Sir _hot_ Jun 2026

Maps unique keys to value payloads; operates outside the Collection root. Hash Buckets ( HashMap ) or Balanced Tree Systems ( TreeMap ).

Java is a popular programming language that is widely used for developing various types of applications, including web, mobile, and desktop applications. Core Java is a fundamental concept in Java programming that covers the basic syntax, data types, operators, control structures, and object-oriented programming (OOP) concepts.

Java remains one of the most popular, robust, and secure programming languages in the software industry. Understanding Java requires a deep dive into its unique architectural components, which ensure platform independence and high performance. The Java Virtual Machine (JVM), JRE, and JDK core java complete notes by durga sir

Fields marked with the transient keyword are skipped during serialization and revert to default values upon deserialization. Reflection API

Protecting internal data from direct outside modification. This is achieved by declaring class variables as private and exposing them through public getter and setter methods. Maps unique keys to value payloads; operates outside

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Abstraction hides internal implementation complexities and reveals only the essential features to the user. Core Java is a fundamental concept in Java

Animal myDog = new Dog(); myDog.makeSound(); // Executes Dog's method at runtime Use code with caution. Abstraction

float (4 bytes), double (8 bytes). Textual: char (2 bytes, uses Unicode character encoding). Logical: boolean (true/false, size is JVM dependent). Reference Data Types