Java Programming Questions & Answers

Q.1 Easy Spring Framework Basics

Which of the following best describes the purpose of Spring's Stereotype annotations (@Service, @Repository)?

A They improve code execution performance

B They mark classes for component scanning and provide semantic meaning

C They enforce specific design patterns

D They are purely optional and provide no functional benefit

Correct Answer: B. They mark classes for component scanning and provide semantic meaning

EXPLANATION

Stereotype annotations (@Service, @Repository, @Controller) enable classpath component scanning and convey the architectural role of the class.

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Q.2 Easy Spring Framework Basics

What does the @Scope annotation with value 'prototype' mean in Spring Framework?

A A new bean instance is created for each request

B The bean is shared across the entire application

C The bean is created once and reused

D The bean is never instantiated

Correct Answer: A. A new bean instance is created for each request

EXPLANATION

Prototype scope creates a new bean instance each time it's requested, unlike singleton which creates only one instance for the entire application.

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Q.3 Easy Spring Framework Basics

Which of the following is NOT a valid Spring Bean scope in Spring Framework 2024?

A Singleton

B Prototype

C Session

D Eternal

Correct Answer: D. Eternal

EXPLANATION

Spring supports singleton, prototype, request, session, application, and websocket scopes. 'Eternal' is not a valid scope in Spring Framework.

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Q.4 Easy Spring Framework Basics

What is the primary purpose of the ApplicationContext in Spring Framework?

A To manage HTTP requests and responses

B To create and manage Spring Beans and their lifecycle

C To handle database connections exclusively

D To configure security policies

Correct Answer: B. To create and manage Spring Beans and their lifecycle

EXPLANATION

ApplicationContext is the core container that instantiates, configures, and manages beans. It also resolves dependencies and manages bean lifecycle.

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Q.5 Easy Spring Framework Basics

Which annotation is used to mark a class as a Spring Bean in the latest Spring Framework 6.0?

A @Component

B @Bean

C @Service

D All of the above

Correct Answer: D. All of the above

EXPLANATION

@Component, @Service, @Repository, and @Controller are all stereotype annotations that mark classes as Spring Beans. @Bean is used for method-level bean definition.

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Q.6 Easy Spring Framework Basics

What is the default behavior of Spring when multiple beans of the same type are available for autowiring?

A Throws NoUniqueBeanDefinitionException

B Autowires the bean marked with @Primary

C Autowires the first bean registered in the container

D Skips autowiring and requires manual configuration

Correct Answer: A. Throws NoUniqueBeanDefinitionException

EXPLANATION

Spring raises NoUniqueBeanDefinitionException when ambiguity exists. Use @Primary or @Qualifier to resolve the ambiguity.

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Q.7 Easy Spring Framework Basics

What is the primary advantage of using Spring Dependency Injection over manual object creation?

A Reduces code coupling, improves testability, and simplifies bean management

B Increases application performance by caching objects in memory

C Eliminates the need for writing Java code

D Automatically implements all design patterns used in the application

Correct Answer: A. Reduces code coupling, improves testability, and simplifies bean management

EXPLANATION

DI reduces tight coupling between classes, making code more maintainable, testable, and flexible for changes or mock implementations during testing.

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Q.8 Easy Spring Framework Basics

What is the difference between @Component and @Service annotations in Spring?

A @Component is generic, while @Service is semantically used for business logic classes

B @Service provides additional database transaction management capabilities

C @Component requires manual bean registration, while @Service auto-registers

D There is no functional difference; they are completely interchangeable

Correct Answer: A. @Component is generic, while @Service is semantically used for business logic classes

EXPLANATION

@Component is a generic stereotype, while @Service is a specialized annotation indicating the class contains business logic, improving code readability.

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Q.9 Easy Spring Framework Basics

Which of the following correctly describes the lifecycle of a singleton-scoped Spring bean?

A Created once per HTTP request and destroyed after the request completes

B Created once when the ApplicationContext is initialized and persists throughout the application lifetime

C Created every time it is referenced and destroyed immediately after use

D Created in a separate thread context and shared across multiple threads

Correct Answer: B. Created once when the ApplicationContext is initialized and persists throughout the application lifetime

EXPLANATION

Singleton beans are instantiated once per Spring container and reused for the application's lifetime, making them memory-efficient for stateless objects.

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Q.10 Easy Spring Framework Basics

In Spring Framework, what is the primary purpose of the @Autowired annotation?

A To automatically inject dependent beans into a class

B To define a new bean in the Spring container

C To configure database connections

D To enable component scanning

Correct Answer: A. To automatically inject dependent beans into a class

EXPLANATION

@Autowired is used for dependency injection, allowing Spring to automatically resolve and inject bean dependencies without explicit configuration.

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