Core Java Complete Notes By Durga Sir Link -

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: A class declared with the abstract keyword. It can contain both abstract methods (without bodies) and concrete methods.

Java categorizes variables based on their scope and location within memory:

(Preferred because it preserves the ability to inherit from another class). core java complete notes by durga sir

Stores all created objects and their instance variables. This is the primary target for Garbage Collection.

The notes are famous for their "Thread Diagrams" and "Flowcharts."

[ Source Code (.java) ] ---> Compiler (javac) ---> [ Bytecode (.class) ] | +--------------------+-----------------------+ | | | [ Windows JVM ] [ Linux JVM ] [ macOS JVM ] | | | (Windows Machine) (Linux Machine) (macOS Machine) This public link is valid for 7 days

List Interface (Duplicates allowed, preserves insertion order)

Always pair your reading with hands-on coding. Conclusion: From Student to Theorist

while (pre-testing), do-while (post-testing, executes at least once), and for / for-each (iteration). Can’t copy the link right now

(Note: The Map interface is also part of the framework but does not inherit from the Collection root interface. It maps unique keys to values, implemented by classes like HashMap and TreeMap .) Key Differences at a Glance LinkedList Resizable Array Doubly Linked List Balanced Tree Duplicates Not Allowed Not Allowed Insertion Order Sorted (Natural/Custom) Best Used For Fast retrieval ( O(1) ) Frequent insert/delete Quick unique checks Sorted unique tracking 6. Advanced Core Modules

= , += , -= , and (condition) ? trueValue : falseValue . Control Flow Statements Selection Statements if-else blocks for conditional routing.

Locking mechanisms to prevent data inconsistency. 7. Java Collection Framework Detailed hierarchy of List, Set, and Map. Cursors (Enumeration, Iterator, ListIterator).