Consider the code: int x = 5; x += 3; What is the value of x?

The correct answer is B: 8. The compound assignment operator += means x = x + 3. So 5 + 3 = 8.

In Java, when an exception is thrown in a try block and caught in a catch block, if the catch block also throws an exception, what happens to the original exception?

The correct answer is C: The original exception is stored in the cause field if exception chaining is used. When exception chaining is explicitly used with initCause() or constructor parameters, the original exception becomes the cause of the new exception. Without explicit chaining, the original exception is lost. Exception chaining is not automatic in Java.

Which of the following is the correct syntax for a multi-line comment in Java?

The correct answer is B: /* This is a comment */. Multi-line comments in Java use /* */ syntax. Single-line comments use //. Other syntaxes are for different languages.

Which of the following lambda expressions has incorrect syntax?

The correct answer is D: (int x, int y) -> x > y ? x : y. Ternary operator inside lambda requires braces and explicit return statement for type inference.

What is the main difference between method overriding and method overloading?

The correct answer is C: Overriding is runtime polymorphism, overloading is compile-time polymorphism. Method overloading is compile-time (static) polymorphism with same method name but different parameters in the same class. Method overriding is runtime (dynamic) polymorphism where a child class provides a specific implementation of a parent method.

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Java OOP, collections, multithreading

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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.1 Hard Spring Framework Basics

In a multi-threaded Spring application with singleton beans, what thread-safety consideration must be kept in mind?

A Singleton beans are automatically thread-safe by Spring

B Developers must ensure singleton bean implementations are thread-safe

C Use synchronized keyword on all methods in singleton beans

D Convert singleton beans to prototype scope for thread safety

Correct Answer: B. Developers must ensure singleton bean implementations are thread-safe

EXPLANATION

Spring doesn't enforce thread-safety for singleton beans. Developers must implement thread-safe code, use immutable objects, or utilize synchronization where necessary.

Test

Q.2 Hard Spring Framework Basics

Consider a Spring application where you need different bean implementations based on the deployment environment. Which approach is most suitable?

A Use @Profile annotation on bean definitions

B Use @Conditional annotation with custom conditions

C Use @ConditionalOnProperty for property-based selection

D All of the above are valid approaches

Correct Answer: D. All of the above are valid approaches

EXPLANATION

@Profile is for environment-based activation, @Conditional for custom logic, and @ConditionalOnProperty for property-driven bean registration. Choice depends on specific requirements.

Test

Q.3 Hard Spring Framework Basics

In a complex Spring application, when would you prefer to use ObjectFactory over direct bean injection?

A To get a new instance of the bean each time it's accessed

B To defer bean creation until it's actually needed

C To break circular dependencies between beans

D All of the above scenarios

Correct Answer: D. All of the above scenarios

EXPLANATION

ObjectFactory enables lazy initialization, provides new instances for prototype beans, and can help resolve circular dependencies through deferred access.

Test

Q.4 Hard Spring Framework Basics

What is the primary difference between BeanFactory and ApplicationContext in Spring?

A ApplicationContext is a subinterface of BeanFactory with additional features

B BeanFactory is more feature-rich than ApplicationContext

C They are completely different unrelated interfaces

D ApplicationContext only works with XML configuration

Correct Answer: A. ApplicationContext is a subinterface of BeanFactory with additional features

EXPLANATION

ApplicationContext extends BeanFactory and adds features like event publishing, message resource handling, and easier AOP integration.

Test

Q.5 Hard Spring Framework Basics

In Spring framework, what is the purpose of FactoryBean interface?

A To create complex bean instances with custom initialization logic

B To define factory methods for creating beans

C To implement the Factory design pattern

D To manage bean lifecycle events

Correct Answer: A. To create complex bean instances with custom initialization logic

EXPLANATION

FactoryBean allows creating beans with sophisticated initialization logic through getObject() method, useful for complex object creation.

Test

Q.6 Hard Spring Framework Basics

Consider a Spring application where method execution time tracking is required across multiple methods. Which approach is most appropriate?

A Using Spring AOP with custom aspect to track execution time

B Adding timing logic manually in each method

C Using @Timed annotation from Spring Actuator

D Implementing a custom servlet filter

Correct Answer: A. Using Spring AOP with custom aspect to track execution time

EXPLANATION

Spring AOP with a custom aspect provides centralized, reusable cross-cutting concern implementation without code duplication in individual methods.

Test

Q.7 Hard Spring Framework Basics

An enterprise application requires different bean implementations based on runtime conditions. Which Spring feature is most suitable?

A @Conditional annotation with custom Condition implementations

B @Profile annotation for environment-specific beans

C Factory pattern with factory beans

D All of the above can be used depending on the scenario

Correct Answer: D. All of the above can be used depending on the scenario

EXPLANATION

@Conditional provides fine-grained control, @Profile handles environment-specific beans, and factory beans offer explicit creation logic. Choice depends on use case requirements.

Test

Q.8 Hard Spring Framework Basics

How does Spring handle circular dependency between two beans?

A Automatically resolves it using setter injection for one of the beans

B Throws BeanCurrentlyInCreationException at startup

C Silently ignores one of the dependencies

D Uses a proxy pattern to defer initialization of one bean

Correct Answer: A. Automatically resolves it using setter injection for one of the beans

EXPLANATION

Spring can resolve circular dependencies when at least one injection is done via setter method rather than constructor, allowing lazy initialization.

Test

Q.9 Hard Spring Framework Basics

A microservices architecture uses Spring with circular dependency between ServiceA and ServiceB. What is the best solution?

A Increase heap memory to handle circular references

B Refactor to introduce a third service or use setter injection with @Lazy

C Use @Autowired on both constructor and setter

D Switch to manual bean management

Correct Answer: B. Refactor to introduce a third service or use setter injection with @Lazy

EXPLANATION

Circular dependencies indicate design issues. Best solutions: refactor code, use setter injection (instead of constructor) combined with @Lazy, or introduce an intermediary service to break the cycle.

Test

Q.10 Hard Spring Framework Basics

In Spring Framework 2024-25, which feature allows lazy initialization of beans?

A @Lazy annotation on @Bean or @Component

B @DeferredInit annotation

C Setting lazy-init='true' only in XML

D Spring automatically detects and lazily initializes all beans

Correct Answer: A. @Lazy annotation on @Bean or @Component

EXPLANATION

@Lazy annotation (available in modern Spring versions) marks beans for lazy initialization. It can be used on class level or with @Bean methods. XML also supports lazy-init attribute.

Test

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