Hitachi Digital Services Interview Questions and Answers

Multi threading in Java can be implemented using two ways: extending the Thread class or implementing the Runnable interface.

• Extend the Thread class and override the run() method.

• Implement the Runnable interface and provide the implementation for the run() method.

• Create an instance of the Thread class and pass an instance of the class implementing Runnable as a parameter.

• Start the thread using the start() method.

• Exampl...read more

Finally, final, and finalize are related words with different meanings.

• Finally is an adverb used to indicate the end of something.

• Final is an adjective used to describe the last or ultimate stage of something.

• Finalize is a verb used to complete or make something final.

• Examples: Finally, I finished my project. The final exam is tomorrow. I need to finalize the contract.

Thrashing is a phenomenon in computer systems where excessive paging or swapping occurs, leading to a decrease in performance.

• Occurs when the system spends more time swapping pages than executing instructions

• Caused by insufficient memory or poorly optimized programs

• Can be observed through high disk activity and low CPU utilization

• Example: A computer running multiple memory-intensive applications simultaneously

The seven layers of the OSI model are: Physical, Data Link, Network, Transport, Session, Presentation, and Application.

• Physical layer: deals with the physical transmission of data

• Data Link layer: responsible for error-free transfer of data between nodes

• Network layer: handles routing and forwarding of data packets

• Transport layer: ensures reliable delivery of data between end systems

• Session layer: establishes, manages, a...read more