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The notes feature clean, structural diagrams illustrating how objects are created in the Heap memory and how threads interact with the Stack memory.
Inheritance allows a new class (subclass/child) to acquire the properties and behaviors of an existing class (superclass/parent).
Access modifiers (private, default, protected, public) and setter/getter design. core java notes by natraj sir pdf free
A subclass provides a specific implementation of a method already defined in its superclass. The JVM resolves the method call at runtime based on the actual object instance, not the reference type. 4. Abstraction
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Multithreading allows concurrent execution of two or more pieces of a program to maximize CPU utilization. Creating a Thread
Differences between String , StringBuilder , and StringBuffer regarding performance and thread safety. Module 6: The Java Collections Framework This module is vital for cracking coding rounds: List Interface: ArrayList , LinkedList , and Vector . A subclass provides a specific implementation of a
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Preventing data race conditions using synchronized methods, synchronized blocks, and object-level/class-level locks.
final is a restrictive modifier for classes/methods/variables; finally is an execution block used for cleanup operations in exception handling; finalize() is a legacy method called by the Garbage Collector before reclaiming an object.