10+ Interview Questions and Answers

API to get logs of a Spring Boot app in Kibana way, reading from the back.

• Use Spring Boot Actuator to expose endpoints for log retrieval

• Configure Logstash to read logs from the application and send to Elasticsearch

• Use Kibana to visualize and search logs

• Implement pagination to read logs from the back

Exceptions encountered during automation testing can include element not found, timeout, invalid input, etc.

• ElementNotVisibleException: When an element is present in the DOM but not visible on the page

• TimeoutException: When a command takes longer than the timeout specified

• NoSuchElementException: When an element could not be found in the DOM

• StaleElementReferenceException: When an element is no longer attached to the DOM

• InvalidInputException: When invalid input is provided to a...read more

Java program to reverse a string

• Create a char array from the input string

• Use two pointers to swap characters from start and end of the array

• Convert the char array back to a string and return

API error codes are numerical or alphanumeric codes that indicate the type of error that occurred during an API request.

• API error codes help developers identify and troubleshoot issues with their API requests.

• Common API error codes include 400 Bad Request, 401 Unauthorized, 404 Not Found, 500 Internal Server Error.

• Each API error code has a specific meaning and can provide valuable information for debugging.

Design a car rental platform like ZoomCar.

• Create a user-friendly website and mobile app for booking cars.

• Integrate GPS and other technologies for easy tracking and navigation.

• Offer a wide range of cars for rent, from hatchbacks to luxury cars.

• Provide flexible rental options, including hourly, daily, and weekly rentals.

• Implement a secure payment gateway for hassle-free transactions.

• Ensure proper maintenance and cleaning of cars before and after each rental.

• Offer 24/7 customer ...read more

Parallel stream allows processing elements concurrently, while stream processes elements sequentially.

• Parallel stream can improve performance by utilizing multiple threads for processing.

• Stream processes elements one by one in a sequential manner.

• Example: stream().parallel() vs stream().sequential()

JDK is a development kit that includes JRE and tools for developing Java applications. JRE is a runtime environment for executing Java programs. JVM is a virtual machine that runs Java bytecode.

• JDK (Java Development Kit) includes JRE (Java Runtime Environment) and development tools like compiler and debugger.

• JRE (Java Runtime Environment) is a software package that provides the libraries and components necessary for running Java applications.

• JVM (Java Virtual Machine) is an a...read more

Final keyword is used in Java to declare constants, prevent method overriding, and prevent class inheritance.

• Used to declare constants - value cannot be changed once assigned

• Prevents method overriding - method cannot be overridden in child classes

• Prevents class inheritance - class cannot be extended

Streams are used in Java to process collections of objects in a functional style.

• Streams allow for concise and readable code when working with collections.

• They support operations like filter, map, reduce, and collect.

• Streams can be sequential or parallel, depending on the processing requirements.

• Example: List names = Arrays.asList("Alice", "Bob", "Charlie"); names.stream().filter(name -> name.startsWith("A")).forEach(System.out::println);