What is the output of the following code? try { int x = 10/0; } catch(ArithmeticException e) { System.out.println("Caught"); } finally { System.out.println("Finally"); } System.out.println("After");

The correct answer is A: Caught\nFinally\nAfter. When ArithmeticException occurs, it's caught by the catch block printing 'Caught'. The finally block always executes, printing 'Finally'. Then normal program flow continues, printing 'After'.

In Spring Framework, what does the @Autowired annotation do when autowiring candidates are ambiguous?

The correct answer is D: Both B and C are correct. When multiple beans match the injection point, Spring throws an exception unless @Primary is used to indicate the preferred bean or @Qualifier specifies which bean to inject.

Consider a scenario where you have nested try-catch blocks. If both inner and outer catch blocks match the thrown exception type, which one executes?

The correct answer is B: Only the inner catch block executes. The innermost matching catch block executes first. If it doesn't rethrow the exception, the outer catch block won't execute. The exception is considered handled after the first matching catch block.

Which of the following is true about abstract classes?

The correct answer is A: They can have constructors. Abstract classes can have constructors to initialize instance variables. They can contain both abstract and concrete methods, and they cannot be directly instantiated.

Consider the following code. What is the behavior? Collection col = new ArrayList(); col.add("Java"); Iterator it = col.iterator(); while(it.hasNext()) { String s = it.next(); col.remove(s); }

The correct answer is B: Throws ConcurrentModificationException. Modifying collection directly while iterating throws ConcurrentModificationException. Use iterator.remove() instead.

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Java Programming

Java OOP, collections, multithreading

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Difficulty: All Easy Medium Hard 11–20 of 476

Topics in Java Programming

All Basics & Syntax 100 OOP in Java 100 Collections Framework 100 Multithreading 100 Exception Handling 100 I/O Streams 100 JDBC 100 Generics 100 Lambda Expressions 100 Spring Framework Basics 58

Q.11 Medium Spring Framework Basics

What is the difference between constructor injection and setter injection in Spring?

A Constructor injection provides immutability and mandatory dependencies; setter injection allows optional dependencies

B Constructor injection is deprecated in Spring 5.0+

C Setter injection is more secure and recommended for sensitive data

D There is no practical difference; both have identical performance

Correct Answer: A. Constructor injection provides immutability and mandatory dependencies; setter injection allows optional dependencies

EXPLANATION

Constructor injection enforces required dependencies and creates immutable objects; setter injection allows optional dependencies and partial initialization.

Test

Q.12 Medium Spring Framework Basics

When would you use request-scoped beans in a Spring web application?

A To store request-specific data that should not be shared across different HTTP requests

B To reduce memory consumption by reusing beans across requests

C To improve application performance significantly

D To simplify configuration by avoiding singleton bean management

Correct Answer: A. To store request-specific data that should not be shared across different HTTP requests

EXPLANATION

Request-scoped beans are instantiated per HTTP request and destroyed after request completion, ideal for storing user-specific or request-specific information.

Test

Q.13 Medium Spring Framework Basics

What does the @EnableCaching annotation enable in a Spring application?

A Declarative caching support using @Cacheable, @CacheEvict, and similar annotations

B Automatic HTTP response caching by the server

C Database query result caching with Redis integration

D Browser-level caching of static resources

Correct Answer: A. Declarative caching support using @Cacheable, @CacheEvict, and similar annotations

EXPLANATION

@EnableCaching activates Spring's caching infrastructure, allowing method-level caching through annotations like @Cacheable to store and retrieve results.

Test

Q.14 Medium Spring Framework Basics

What is the significance of the @ConfigurationProperties annotation in Spring Boot?

A It binds external configuration properties to Java objects with type-safe access

B It encrypts sensitive configuration values automatically

C It validates configuration file syntax during application startup

D It generates configuration files from Java classes

Correct Answer: A. It binds external configuration properties to Java objects with type-safe access

EXPLANATION

@ConfigurationProperties enables binding of external properties (from application.properties/yml) to POJO classes, providing type safety and validation.

Test

Q.15 Medium Spring Framework Basics

What does the @Transactional annotation do in Spring?

A Manages database transactions, handling commit and rollback automatically

B Encrypts data being transmitted across the network

C Logs all database operations performed by the method

D Validates input parameters before method execution

Correct Answer: A. Manages database transactions, handling commit and rollback automatically

EXPLANATION

@Transactional delegates transaction management to Spring, automatically committing on success and rolling back on exceptions, following ACID principles.

Test

Q.16 Medium Spring Framework Basics

In Spring AOP, what does the term 'Join Point' refer to?

A A specific point during program execution where an aspect can be applied

B The code written in an aspect to handle cross-cutting concerns

C A method that connects multiple beans together

D The configuration file that defines AOP rules

Correct Answer: A. A specific point during program execution where an aspect can be applied

EXPLANATION

A Join Point is a candidate point in program execution (method call, exception throw) where advice can be applied. Pointcuts select specific Join Points.

Test

Q.17 Medium Spring Framework Basics

What is the function of the BeanFactory interface in Spring?

A To create and manage bean instances with lazy initialization capability

B To provide enterprise features like AOP and transaction management

C To store all bean metadata in an internal registry

D To enforce naming conventions for beans

Correct Answer: A. To create and manage bean instances with lazy initialization capability

EXPLANATION

BeanFactory is the core interface for accessing beans, providing lazy initialization. ApplicationContext extends BeanFactory with additional enterprise features.

Test

Q.18 Medium Spring Framework Basics

In Spring Data JPA, what does the @Repository annotation signify?

A It marks a class as a data access object and enables exception translation

B It automatically generates SQL queries from method names

C It configures the database connection pool

D It enables caching for database queries

Correct Answer: A. It marks a class as a data access object and enables exception translation

EXPLANATION

@Repository marks a class as a data access component and enables Spring to translate persistence-specific exceptions into Spring's DataAccessException hierarchy.

Test

Q.19 Medium Spring Framework Basics

What is the role of PropertySource annotation in Spring Framework?

A To define external property files and load their values into the environment

B To create new properties dynamically at runtime

C To encrypt sensitive properties automatically

D To validate property values against defined constraints

Correct Answer: A. To define external property files and load their values into the environment

EXPLANATION

@PropertySource allows loading properties from external files (like .properties or .yml) into the Spring Environment for use throughout the application.

Test

Q.20 Medium Spring Framework Basics

Consider a scenario where you have two bean implementations of the same interface. How would you specify which one to inject using Spring annotations?

A Use @Primary on one bean and @Autowired on the injection point

B Use @Qualifier annotation with the bean name at the injection point

C Use @Autowired with @Primary or @Qualifier; both approaches work

D Use @Bean with explicit configuration in @Configuration class

Correct Answer: C. Use @Autowired with @Primary or @Qualifier; both approaches work

EXPLANATION

Both @Primary (default choice) and @Qualifier (explicit selection by name) can resolve bean ambiguity. @Qualifier is more explicit and takes precedence over @Primary.

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