Simple, but limits your class from inheriting other classes.
> , >= , < , <= , == , != . These always return a boolean value. Logical vs. Short-Circuit Operators:
+-------------------------------------------------------+ | Class Loader | +-------------------------------------------------------+ | v +-------------------------------------------------------+ | Runtime Data | | +--------+ +--------+ +-------+ +----+ +------+ | | | Method | | Heap | | Stack | | PC | |Native| | | | Area | | Area | | Area | |Reg | | Stack| | | +--------+ +--------+ +-------+ +----+ +------+ | +-------------------------------------------------------+ | v +-------------------------------------------------------+ | Execution Engine | | +--------------------+ +-------------------------+ | | | Interpreter | | JIT Compiler | | | +--------------------+ +-------------------------+ | | | Garbage Collector | | +-------------------------------------------------------+ Class Loader Subsystem
| Learner Type | Benefit | |--------------|---------| | Beginner | Clear, step-by-step from zero | | College student | Covers syllabus + beyond (placements) | | Working professional | Quick reference & deep dives | | Interview candidate | Top 100+ tricky Q&As included |
Ready to run and waiting for CPU allocation from the thread scheduler. Running: Actively executing its code inside run() .
LinkedHashSet : Maintains a doubly-linked list running through its hash buckets to preserve insertion order.
: Backed by a doubly-linked list structure. Excels at sequential insertions, modifications, or deletions. Set Interface A collection that strictly prohibits duplicate elements.
Note: These notes are widely circulated in the student community. For the most updated content regarding newer Java versions (Java 8 features like Streams and Lambdas are included, but later versions vary), ensure you have a recent edition or supplement with the official Oracle documentation.
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: A block that executes regardless of whether an exception is raised or skipped, commonly used to release file streams or database connections.
The notes are specifically designed to help with OCJP/SCJP certification and job interviews, featuring dedicated sections for frequently asked interview questions and ample solved examples.
: Executes specific blocks based on boolean evaluations.
Runtime anomalies can crash systems. Exception handling keeps your software running smoothly when unexpected errors occur. The Hierarchy
: Checked by the compiler at compile-time (e.g., IOException , SQLException ). The programmer must explicitly handle or declare them.
throw : Used to explicitly throw a user-defined or built-in exception.
