TCS Technical Lead 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

Java is a high-level programming language known for its platform independence and object-oriented approach.

• Java is widely used for developing desktop, web, and mobile applications.

• It is known for its write once, run anywhere (WORA) capability.

• Java uses a virtual machine (JVM) to execute code, providing portability across different operating systems.

• It supports multithreading, exception handling, and dynamic memory allo...read more

Inheritance is a mechanism in object-oriented programming where a new class is created from an existing class.

• Allows for code reuse and promotes code organization

• The new class (subclass) inherits properties and methods from the existing class (superclass)

• Subclass can add new properties and methods or override existing ones

• Example: A Car class can inherit properties and methods from a Vehicle class

Strong OOPS concept is essential for Java developers to write efficient and maintainable code.

• Understanding of classes, objects, inheritance, polymorphism, and encapsulation

• Ability to design and implement complex systems using OOPS principles

• Experience with design patterns and SOLID principles

• Knowledge of interfaces, abstract classes, and access modifiers

• Familiarity with UML diagrams for modeling software systems