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Tata Motors Interview Questions and Answers

Updated 26 Dec 2024

Q1. What are the operations for adding and removing elements in an ArrayList in Java?

Ans.

Operations for adding and removing elements in an ArrayList in Java

  • To add an element to an ArrayList, use the add() method with the index where you want to insert the element

  • To remove an element from an ArrayList, use the remove() method with the index of the element you want to remove

  • Example: ArrayList<String> list = new ArrayList<>(); list.add("Apple"); list.add("Banana"); list.remove(0); // Removes Apple

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Q2. What is an example of session start and end in programming?

Ans.

Session start and end in programming refers to the beginning and termination of a user's session on a website or application.

  • Session start occurs when a user logs in or visits a website, creating a unique session ID.

  • Session end happens when the user logs out or closes the browser, terminating the session.

  • Example: In Java servlets, HttpSession object is used to manage session start and end.

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Q3. How would you call multiple APIs and fetch data from each API sequentially?

Ans.

To call multiple APIs and fetch data sequentially, use asynchronous calls and handle responses in order.

  • Use asynchronous calls to make API requests in parallel

  • Handle responses in order to ensure data is fetched sequentially

  • Use promises or callbacks to manage the flow of data retrieval

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Q4. What is the process to synchronize an ArrayList in Java?

Ans.

Use synchronizedList() method to synchronize an ArrayList in Java.

  • Create a synchronized list using Collections.synchronizedList() method.

  • Example: List<String> synchronizedList = Collections.synchronizedList(new ArrayList<>());

  • Access and modify the synchronized list using synchronized blocks to ensure thread safety.

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Q5. What is the default value of an ArrayList in Java?

Ans.

The default value of an ArrayList in Java is an empty ArrayList.

  • Default value is an empty ArrayList, which means it has a size of 0.

  • The ArrayList will not have any elements stored in it by default.

  • Example: ArrayList<String> list = new ArrayList<>(); // Default value is an empty list.

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Q6. What is a synchronous call in JavaScript?

Ans.

A synchronous call in JavaScript is a function call that blocks the execution of the code until it completes.

  • Synchronous calls wait for the function to finish before moving on to the next line of code.

  • They can cause the program to become unresponsive if the function takes a long time to complete.

  • Example: Using the 'fetch' API to make a synchronous call to a server.

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Q7. What is a concurrent HashMap?

Ans.

ConcurrentHashMap is a thread-safe version of HashMap in Java.

  • ConcurrentHashMap allows multiple threads to read and write to the map concurrently without the need for external synchronization.

  • It achieves this by dividing the map into segments, each of which can be locked independently for better performance.

  • ConcurrentHashMap is part of the java.util.concurrent package and was introduced in Java 5.

  • Example: ConcurrentHashMap<String, Integer> map = new ConcurrentHashMap<>();

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