Core Java Complete Notes By Durga Sir Top -

The + operator overloaded behavior. If at least one operand is a String, it performs concatenation; otherwise, it performs arithmetic addition.

Distinction between keywords (active) and reserved literals like true , false , and null . :

The notes span the entire spectrum of Core Java, covering everything from basics to advanced features. 1. Introduction and Basics History of Java and its features (Platform independence). JVM, JRE, and JDK architecture explained simply. Data types, variables, type casting, and operators. Control flow statements (if-else, loops, switch-case). 2. Object-Oriented Programming (OOPs)

The java.lang package is automatically imported into every Java program. String manipulation is arguably the most exercised topic in software engineering. core java complete notes by durga sir top

Java features 8 primitive data types grouped into numeric, textual, and boolean categories.

Unchecked Exceptions: Occur at runtime (e.g., NullPointerException , ArithmeticException ). Usually caused by bad program logic. try , catch , finally , throw , and throws .

Abstraction hides internal complexities and exposes only essential features. The + operator overloaded behavior

TreeSet : Implements NavigableSet backed by a Red-Black tree structure. Elements are stored in sorted, natural ascending order ( performance).

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Reads and executes instructions line-by-line. It is fast to start but slow during execution loops. : The notes span the entire spectrum of

Mastery of while , do-while , for , and the enhanced for-each loop introduced for seamless collection iteration.

Throwable / \ / \ Error Exception / \ / \ RuntimeException IOException / SQLException (Unchecked) (Checked) Checked vs. Unchecked Exceptions

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Used to initialize an object.

The try block holds risky code, catch handles the exception, and finally executes clean-up code regardless of an exception occurring.