Comprehensive Core Java Guide: Master the Fundamentals Inspired by Durga Sir's Teaching Methodology Introduction to Java and its Architecture
throws : Used in method declarations to delegate exception handling to the caller. 4. Multi-Threading
To traverse collection instances sequentially, Java provides three primary tools:
Trigger the stream processing to produce results or side effects (e.g., collect() , forEach() , reduce() ). core java complete notes by durga sir
List Interface (Duplicates allowed, preserves insertion order)
Java supports Single , Multilevel , and Hierarchical inheritance. Java does not support Multiple Inheritance through classes to avoid the ambiguity problem (Diamond Problem). It can, however, be achieved via interfaces. Polymorphism
Are you reviewing this material for an , a university exam , or a practical project ? Polymorphism Are you reviewing this material for an
Occur at runtime (e.g., NullPointerException , ArithmeticException ). They typically indicate programming logic errors. The Keywords: try, catch, finally, throw, throws try: Encloses risky code that might throw an exception.
An array is a collection of homogeneous data elements stored in contiguous memory locations.
The Stream API offers a declarative approach to processing collections of objects using pipeline functions. Floating-Point: float (4 bytes)
finally : An optional block that , regardless of whether an exception is thrown or caught. Ideal for clean-up tasks like closing database connections or file streams.
The JVM acts as the engine driving Java applications. Durga Sir's notes categorize the internal memory model into distinct sections:
Allows threads to coordinate activities smoothly using wait() , notify() , and notifyAll() . These methods must be called strictly within a synchronized context to avoid a IllegalMonitorStateException . The Java Collection Framework
byte (1 byte), short (2 bytes), int (4 bytes), long (8 bytes). Floating-Point: float (4 bytes), double (8 bytes).