HashSet : Uses a hash table; offers constant-time performance for basic operations.
Understanding how Class Loaders, Method Areas, and Garbage Collection function elevates you from a syntax-writer to a true software engineer.
Arrays in Java are objects. You must master single-dimensional and multi-dimensional array declaration, construction, and initialization. Remember that array size cannot be changed once allocated. core java complete notes by durga sir top
PriorityQueue , Deque , and ArrayDeque . Map Interface (Key-Value Pairs, Keys are unique): HashMap : Non-synchronized, allows one null key. LinkedHashMap : Preserves insertion order of keys. TreeMap : Keys are sorted. Hashtable : Legacy, synchronized, no nulls allowed. 7. Java Input/Output (I/O) & Serialization How Java interacts with external files and networks.
Java provides four levels of visibility to control access to classes, methods, and variables: Subclass (Outer Package) default protected Yes (via inheritance only) public 4. Exceptional Handling HashSet : Uses a hash table; offers constant-time
Exceptions disrupt the normal flow of a program. Java's robust exception framework ensures applications don't crash unexpectedly.
Evaluated by the compiler at compile-time (e.g., IOException , SQLException ). The programmer must handle them using try-catch blocks or declare them using the throws keyword. Map Interface (Key-Value Pairs, Keys are unique): HashMap
Java owes its global popularity to several distinct characteristics:
For the Core Java round – 100% Yes . These notes cover internal working of HashMap, Concurrent modifications, and memory management which are standard MAANG interview questions for junior roles.
Caused by the application logic and are recoverable (e.g., IOException , NullPointerException ).
Lambda expressions, Stream API, and Functional Interfaces. How to Utilize "Durga Sir Top Notes" Effectively
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