What is the behavior of get() method in LinkedHashMap with accessOrder=true?

The correct answer is B: Moves accessed element to end (updates access order). LinkedHashMap with accessOrder=true maintains access-order. get() moves the element to the end (LRU cache behavior).

Which annotation is used to define configuration classes in Spring that replace XML configuration?

The correct answer is C: @Configuration. @Configuration marks a class as a source of bean definitions. It's equivalent to an XML element and works with @Bean methods.

In Java 8, a lambda expression can access local variables from its enclosing scope. What is the constraint on these variables?

The correct answer is A: They must be declared as final or effectively final. Lambda expressions can only access local variables that are final or effectively final to ensure thread safety and immutability.

What is the difference between execute() and executeUpdate() methods?

The correct answer is C: Both A and B are correct. execute() returns true/false and handles any SQL, while executeUpdate() returns affected rows count for DML statements only.

Which interface must be implemented by a class to make its objects serializable?

The correct answer is B: Serializable. The Serializable interface is a marker interface that indicates a class can be serialized. It's found in java.io package and requires no methods to be implemented.

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Java Programming
Spring Framework Basics

Java OOP, collections, multithreading

31 Q 10 Topics Take Mock Test

Difficulty: All Easy Medium Hard 31–31 of 31

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.31 Medium Spring Framework Basics

A Spring application requires constructor-based dependency injection for a mandatory dependency. Which approach is best?

A @Autowired on setter method

B @Autowired on constructor

C @Resource annotation

D Manual object creation

Correct Answer: B. @Autowired on constructor

EXPLANATION

Constructor-based DI ensures mandatory dependencies are provided at object creation time and is considered a best practice for required dependencies.

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