Virtusa Consulting Services Senior Java Developer Interview Questions and Answers

Computer networking is the practice of connecting devices together to share resources and communicate with each other.

• Computer networking involves the use of hardware and software to connect devices together, such as computers, printers, and servers.

• Networking protocols, such as TCP/IP, are used to facilitate communication between devices.

• Examples of computer networks include local area networks (LANs), wide area netwo...read more

Interfaces define a contract for classes to implement certain methods and properties.

• Interfaces allow for polymorphism and loose coupling.

• Classes can implement multiple interfaces.

• Interfaces cannot be instantiated on their own.

• Interfaces can have default method implementations.

• Interfaces can be used to enforce design patterns like the adapter pattern.

Program to print a pattern and implement bubble sort on an array of strings.

• For pattern printing, use nested loops to print the desired pattern.

• For bubble sort, compare adjacent elements and swap if necessary.

• Use a loop to iterate through the array until no more swaps are needed.

Network layers are a hierarchical way of organizing communication protocols.

• Network layers provide a modular approach to networking.

• Each layer has a specific function and communicates with adjacent layers.

• The OSI model has 7 layers, while the TCP/IP model has 4 layers.

• Examples of layers include the physical layer, data link layer, network layer, transport layer, and application layer.

Deadlock is a situation where two or more processes are unable to proceed because they are waiting for each other to release resources.

• Occurs in multi-threaded/multi-process environments

• Can lead to system freeze or crash

• Prevention techniques include resource ordering and timeouts

• Example: Process A holds resource X and waits for resource Y, while Process B holds resource Y and waits for resource X

Paging and Segmentation are memory management techniques used by operating systems.

• Paging divides memory into fixed-size pages and stores them in physical memory.

• Segmentation divides memory into logical segments and stores them in physical memory.

• Paging allows for efficient use of physical memory and reduces fragmentation.

• Segmentation allows for protection and sharing of memory between processes.

• Examples of operating s...read more