Core Java Complete Notes By Durga Sir Top !!link!! Here

Integer : byte (1 byte), short (2 bytes), int (4 bytes), long (8 bytes). Floating-point : float (4 bytes), double (8 bytes). Character : char (2 bytes, using Unicode system).

Created individually for each thread. It allocates a unique Stack Frame every time a thread invokes a method. A frame stores local variables, intermediate calculations, and method return addresses.

HashSet : Backed by a hash table. Provides near-instant performance (

Runnable r = () -> System.out.println("run"); new Thread(r).start(); core java complete notes by durga sir top

Allowed characters: [a-z] , [A-Z] , [0-9] , _ (underscore), and $ (dollar sign). Cannot begin with a digit. Case-sensitive ( total and Total are different).

: A literal is a constant value assigned to a variable. Examples include integral literals (decimal, octal, hexadecimal, and binary), floating-point literals, character literals (including escape sequences), and string literals.

If two objects are equal according to the equals(Object) method, they must return the identical integer hash value via hashCode() . Failing to do so breaks collection types like HashMap and HashSet . Integer : byte (1 byte), short (2 bytes),

One of the main reasons these notes are labeled "Top" is their historical alignment with the .

Preserves insertion order; permits duplicates; fast random access. LinkedList Doubly Linked List Fast elements insertion/deletion; slow random access. Vector Resizable Array Legacy class; fully synchronized; slower than ArrayList . HashSet Hash Table Disallows duplicates; makes no order guarantees. LinkedHashSet Hash Table + Linked List Disallows duplicates; strictly maintains insertion order. TreeSet Red-Black Tree

Updates include modern additions like Lambda expressions and Streams. Pros & Cons Created individually for each thread

Multiple methods in the same class share the exact same name but feature distinct method signatures (different parameter counts, types, or order).

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Prevents data inconsistency by allowing only one thread to access a critical section at a time using the synchronized keyword.

Goes beyond basic declaration to cover , multidimensional array construction, and the critical difference between length (variable) and length() (method). JVM Memory Management :

: Includes common interview topics like "length vs length()" and "Serialization vs Externalization".