TCS IT Analyst 1 Interview Questions and Answers

The question is asking about the candidate's knowledge in Core Java, Spring, Hibernate, Spring Boot, SQL, and AngularJS.

• Core Java is the foundation of Java programming language.

• Spring is a popular framework for building Java applications.

• Hibernate is an ORM tool used for mapping Java objects to database tables.

• Spring Boot is a framework for building microservices.

• SQL is a language used for managing relational databases...read more

To connect 2 DBs from a Spring Boot application, configure multiple data sources and use JdbcTemplate or EntityManager for each DB.

• Configure multiple data sources in the application.properties file

• Create separate configuration classes for each data source

• Use JdbcTemplate or EntityManager to interact with each DB

• Specify the appropriate data source in the repository or service classes

Abstract method implementation is mandatory while default method is optional.

• Abstract method has no implementation in the abstract class and must be implemented by the subclass.

• Default method has a default implementation in the interface and can be overridden by the implementing class.

• Abstract method is used to enforce a contract while default method is used to provide a default behavior.

• Example: abstract method - publ...read more

Java is a high-level, object-oriented programming language used to develop applications for various platforms.

• Java is platform-independent and can run on any platform with a JVM.

• It is used for developing web, mobile, desktop, and enterprise applications.

• Java has a vast library of pre-built classes and APIs.

• It supports multithreading, exception handling, and garbage collection.

• Java is widely used in the industry for its...read more

Java is a popular, versatile, and reliable programming language used for developing a wide range of applications.

• Java is platform-independent, making it easy to write code once and run it on multiple platforms.

• It has a vast library of pre-built classes and APIs, making development faster and easier.

• Java is highly secure and provides built-in features for encryption and authentication.

• It is widely used in enterprise app...read more

I have used the Singleton design pattern in my Java projects.

• Singleton pattern ensures that only one instance of a class is created and provides a global point of access to it.

• It is useful when we want to limit the number of instances of a class to one.

• Example: Creating a Logger class as a Singleton to ensure only one instance is used throughout the application.

Autoboxing is the automatic conversion of primitive data types to their corresponding object wrapper classes.

• Autoboxing is useful when working with collections that require objects instead of primitives.

• Example: int i = 5; Integer j = i; //autoboxing

• Unboxing is the opposite of autoboxing, where an object of a wrapper class is converted back to its corresponding primitive type.

• Example: Integer j = 5; int i = j; //unboxi

Typecasting up and down refers to converting a variable of one data type to another data type of higher or lower precision.

• Typecasting up involves converting a variable of lower precision to a variable of higher precision, such as converting an int to a double.

• Typecasting down involves converting a variable of higher precision to a variable of lower precision, such as converting a double to an int.

• Typecasting can resul...read more

To iterate a map in Java, use a for-each loop or an iterator.

• Use the entrySet() method to get a set of key-value pairs

• For-each loop: for(Map.Entry entry : map.entrySet())

• Iterator: Iterator> iterator = map.entrySet().iterator();

• Use hasNext() and next() methods to iterate through the map

Types of synchronization in Java

• Synchronized methods

• Synchronized statements

• ReentrantLock

• Semaphore

• CountDownLatch

Access modifiers in method overriding

• Access modifiers in the overriding method cannot be more restrictive than the overridden method

• The access modifier can be less restrictive or the same as the overridden method

• Private methods cannot be overridden

• Examples: public method can be overridden by public or protected method, but not by private method