TEKsystems Interview Questions and Answers

A linked list is a linear data structure where elements are stored in nodes, each pointing to the next node.

• A linked list consists of nodes, where each node contains data and a reference to the next node.

• Types of linked lists include singly linked lists, doubly linked lists, and circular linked lists.

• Example of a singly linked list: Node1 -> Node2 -> Node3 -> NULL.

• In a doubly linked list, each node has re...read more

Interfaces define contracts for classes, enabling polymorphism and promoting loose coupling in software design.

• 1. **Polymorphism**: Interfaces allow different classes to be treated as the same type. For example, both 'Dog' and 'Cat' can implement an 'Animal' interface.

• 2. **Loose Coupling**: By programming to an interface rather than a concrete class, systems become more flexible and easier to maintain.

• 3. **Multipl...read more

I often face challenges like tight deadlines, communication issues, and adapting to new technologies in software development.

• Tight deadlines can lead to stress; for example, delivering a project in two weeks instead of a month.

• Communication issues arise when team members are remote, making it hard to align on project goals.

• Adapting to new technologies can be daunting; for instance, learning a new framework in a sh...read more

JUnit is a popular framework for writing and running unit tests in Java, ensuring code reliability and correctness.

• JUnit annotations: Use @Test to indicate a test method.

• Assertions: Use assertEquals(expected, actual) to verify outcomes.

• Setup and teardown: Use @Before and @After for initializing and cleaning up resources.

• Parameterized tests: Use @RunWith(Parameterized.class) for testing multiple inputs.

Understanding basic data structures and algorithms is crucial for coding interviews.

• Data Structures: Arrays, Linked Lists, Stacks, Queues, Trees, Graphs.

• Algorithms: Sorting (e.g., Quick Sort, Merge Sort), Searching (e.g., Binary Search).

• Complexity Analysis: Big O notation to evaluate performance.

• Example: Use a stack to reverse a string efficiently.

Iterate through the array and return the index of the first occurrence of 1.

• Iterate through the array using a loop.

• Check each element of the array, if it is 1 then return its index.

• If no 1 is found, return -1.

Spring Boot is a framework that simplifies the development of Java applications by providing pre-configured settings and tools.

• Spring Boot eliminates the need for manual configuration by providing defaults for most settings.

• It allows for the creation of stand-alone, production-grade Spring-based applications.

• Spring Boot includes embedded servers like Tomcat, Jetty, or Undertow for easy deployment.

• It promotes conve...read more