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What is the difference between HashMap and ConcurrentHashMap? Explain the difference between ArrayList and LinkedList. When would you use each? What is multithreading in Java? How do you create a thread? What is the difference between == and .equals()? Explain the concepts of OOP (Encapsulation, Inheritance, Polymorphism, Abstraction) with examples. What is the difference between checked and unchecked exceptions? How does Garbage Collection work in Java? What are Java Streams? Give an example using filter() and map(). What is the difference between String, StringBuilder, and StringBuffer? Explain the Collections Framework and common interfaces like List, Set, Map, and Queue. How would you optimize a slow Selenium automation framework? How do you implement Page Object Model (POM) in Selenium? How do you handle dynamic web elements in Selenium? Explain explicit wait, implicit wait, and fluent wait. How do you run Selenium tests in parallel using TestNG?
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SW test team lead

Interviewed at Infosys

3.6★
Jul 7, 2026

What is the difference between HashMap and ConcurrentHashMap? Explain the difference between ArrayList and LinkedList. When would you use each? What is multithreading in Java? How do you create a thread? What is the difference between == and .equals()? Explain the concepts of OOP (Encapsulation, Inheritance, Polymorphism, Abstraction) with examples. What is the difference between checked and unchecked exceptions? How does Garbage Collection work in Java? What are Java Streams? Give an example using filter() and map(). What is the difference between String, StringBuilder, and StringBuffer? Explain the Collections Framework and common interfaces like List, Set, Map, and Queue. How would you optimize a slow Selenium automation framework? How do you implement Page Object Model (POM) in Selenium? How do you handle dynamic web elements in Selenium? Explain explicit wait, implicit wait, and fluent wait. How do you run Selenium tests in parallel using TestNG?

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