Which package contains the built-in functional interfaces in Java?

The correct answer is A: java.util.function. The java.util.function package contains functional interfaces like Predicate, Consumer, Function, Supplier, and BiFunction introduced in Java 8.

What is the output of exception chaining in Java?

The correct answer is B: One exception wraps another exception preserving the original cause. Exception chaining wraps a caught exception within another exception using initCause() or constructor, preserving the original exception for debugging and stack trace analysis.

Consider the following code. What will be printed? String s = "Java"; s = s.concat(" Programming"); System.out.println(s.length());

The correct answer is C: 17. "Java" has 4 characters. After concatenation with " Programming" (12 characters including space), the total length is 4 + 13 = 17 characters.

Which interface must be implemented to create a thread in Java?

The correct answer is A: Runnable. The Runnable interface is the correct interface to implement for creating threads in Java. It has a single abstract method run().

In Spring Framework, which interface represents a factory pattern implementation for creating objects?

The correct answer is D: All of the above. BeanFactory is the basic container, ObjectFactory is for lazy bean retrieval, and FactoryBean allows custom bean creation logic. All represent factory patterns in Spring.

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Java Programming
JDBC

Java OOP, collections, multithreading

46 Q 10 Topics Take Mock Test

Difficulty: All Easy Medium Hard 41–46 of 46

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.41 Medium JDBC

Which DriverManager method is used to establish a database connection?

A createConnection()

B getConnection()

C establishConnection()

D openConnection()

Correct Answer: B. getConnection()

EXPLANATION

DriverManager.getConnection() is the standard method that takes URL, username, and password to establish a connection to the database.

Test

Q.42 Medium JDBC

What is Connection pooling in JDBC?

A Storing multiple database connections in a pool for reuse

B Combining multiple queries into one

C Creating backup connections

D Automatic connection switching

Correct Answer: A. Storing multiple database connections in a pool for reuse

EXPLANATION

Connection pooling maintains a pool of reusable database connections to improve performance and reduce overhead of creating new connections repeatedly.

Test

Q.43 Medium JDBC

Which method must be called to move cursor to the next row in ResultSet?

A next()

B moveNext()

C advance()

D fetch()

Correct Answer: A. next()

EXPLANATION

The next() method moves the ResultSet cursor to the next row and returns true if a row exists, false if no more rows. It's essential for iterating through results.

Test

Q.44 Medium JDBC

What is the primary advantage of using PreparedStatement over Statement?

A Faster execution and SQL injection prevention

B Larger result set size

C Better memory management

D Automatic type conversion

Correct Answer: A. Faster execution and SQL injection prevention

EXPLANATION

PreparedStatement offers faster execution due to precompilation and prevents SQL injection through parameterized queries using placeholders (?).

Test

Q.45 Medium JDBC

Which interface is used to execute precompiled SQL statements in JDBC?

A Statement

B PreparedStatement

C CallableStatement

D BatchStatement

Correct Answer: B. PreparedStatement

EXPLANATION

PreparedStatement is used for precompiled SQL statements with parameters. It provides better performance and prevents SQL injection compared to Statement.

Test

Q.46 Medium JDBC

What does the executeUpdate() method return in JDBC?

A A ResultSet object

B Number of rows affected

C A boolean value

D Query execution time

Correct Answer: B. Number of rows affected

EXPLANATION

executeUpdate() returns an integer representing the number of rows affected by INSERT, UPDATE, or DELETE operations. executeQuery() returns ResultSet.

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