TCS iON Java Developer Interview Questions, Process, and Tips

Q1. What is a wrapper class in java
Ans. 
Wrapper classes in Java are classes that allow primitive data types to be accessed as objects.
• Wrapper classes provide a way to convert primitive data types into objects.

• They are used when an object is required, such as in collections or generics.

• Examples include Integer for int, Double for double, Boolean for boolean, etc.
Answered by AI
Add your answer
Q2. Encapsulation with an example?
Ans. 
Encapsulation is the concept of bundling data and methods that operate on the data into a single unit.
• Encapsulation helps in hiding the internal state of an object and restricting access to it.

• It allows for better control over the data by preventing external code from directly modifying it.

• Example: A class 'Car' with private variables like 'model', 'year', and public methods like 'getYear()' and 'setModel()'.
Answered by AI
Add your answer
Q3. What is the difference between hashmap and hashset
Ans. 
HashMap is a key-value pair collection while HashSet is a collection of unique elements.
• HashMap stores key-value pairs while HashSet stores unique elements.

• HashMap allows duplicate values but keys must be unique, while HashSet does not allow duplicates.

• HashMap uses keys to retrieve values, while HashSet does not have keys and values are the same.

• Example: HashMap map = new HashMap<>(); HashSet set = new
Answered by AI
Add your answer
Q4. What is the usage of optinal class
Ans. 
Optional class is used to handle null values in Java, preventing NullPointerExceptions.
• Optional class was introduced in Java 8 to provide a more elegant way of handling null values.

• It encourages developers to explicitly handle the presence or absence of a value, rather than relying on null checks.

• Optional class has methods like isPresent(), get(), orElse(), etc. to work with optional values.

• Using Optional class can mak...read more
Answered by AI
Add your answer

Q1. Just basic question tell me about yourself
Add your answer

Duration is 1 hr and topic is core java

Q1. What i sth OOPS
Add your answer
Q2. What i s abstract class
Add your answer

Q1. Java 8 Questions were asked
Add your answer
Q2. Explain stream api and lambda expression
Ans. 
Stream API is a set of classes in Java that allow processing collections of objects in a functional style. Lambda expressions are used to write concise code for functional interfaces.
• Stream API provides a way to perform operations on collections like filter, map, reduce, etc.

• Lambda expressions are used to define anonymous functions in a concise way.

• Example: List names = Arrays.asList("Alice", "Bob", "Charlie"); names....read more
Answered by AI
Add your answer

Q1. What is the salary expected
Ans. 
Salary expectations are based on experience, skills, location, and company size.
• Consider factors like years of experience, specialized skills, industry demand, and cost of living in the area.

• Research average salaries for Java Developers in your location and industry.

• Be prepared to negotiate based on the job responsibilities and benefits offered.

• Provide a salary range rather than a specific number to allow for negotiati
Answered by AI
Add your answer
Q2. Ho soon you can join
Add your answer

Quants,logical,verbal questions were asked in this round

Gd was held within 10 participants with a abstract topic

Q1. Tell me about yourself and your key strength and weakness
Add your answer
Q2. The rest of the interview was entirely filled with technical questions
Add your answer
Q3. Data structures questions were asked
Add your answer