Durga Sir: Core Java Complete Notes By

| Interface | Implementations | Ordering | Duplicates | Null values | | :--- | :--- | :--- | :--- | :--- | | List | ArrayList, LinkedList | Indexed | Yes | Yes | | Set | HashSet, LinkedHashSet | Unordered | No | One null | | SortedSet | TreeSet | Sorted | No | No (throws NPE) | | Map | HashMap, LinkedHashMap | Key-Value pair | Unique keys | One null key |

If you want, I can expand any section into detailed notes, add code examples for specific topics, or generate a printable PDF of these notes. core java complete notes by durga sir

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This is a comprehensive guide and summary structured around the famous "Core Java" notes by Durga Sir (Durga Software Solutions). His notes are widely considered the gold standard for Java beginners and students preparing for interviews and certifications. | Interface | Implementations | Ordering | Duplicates

The notes generally follow a strict hierarchy, moving from basic programming concepts to advanced Object-Oriented Programming (OOP). Below is a structured guide organized by his typical teaching modules. Every code snippet in the notes should be

Every code snippet in the notes should be typed (not copy-pasted) into an IDE or a plain text editor. Change variable names, add new methods, and break the code to see the exceptions.

Durga Sir’s notes dedicate a full section to array declarations:

int[] x; // Recommended
int []x;
int x[];