Java Developer Interview Questions and Answers in 2025 (100+ Q&A)

JAVA Java Developer

Ques:- What do you mean by a Socket?

Asked In :- Orion Innovation, Majorel, dhandhania infotech,

Right Answer:
A socket is an endpoint for sending and receiving data across a network. It allows communication between two machines, typically using TCP or UDP protocols.

JAVA Java Developer

Ques:- Tell the advantages of Java Sockets?

Asked In :- Chella Software, tieto,

Right Answer:
1. **Platform Independence**: Java sockets work on any platform that supports Java, allowing for cross-platform communication.

2. **Ease of Use**: Java provides a simple and straightforward API for socket programming, making it easier to implement network communication.

3. **Object-Oriented**: Java sockets are designed using object-oriented principles, promoting code reusability and maintainability.

4. **Rich API**: Java offers a rich set of classes and methods for handling various networking tasks, including TCP and UDP communication.

5. **Built-in Security**: Java sockets can utilize SSL/TLS for secure communication, enhancing data security over the network.

6. **Multithreading Support**: Java's multithreading capabilities allow for handling multiple socket connections simultaneously, improving performance.

7. **Robustness**: Java's exception handling and garbage collection contribute to the stability and reliability of socket applications.

JAVA Java Developer

Ques:- Where is the import statement used in a Java program?

Asked In :- BeeHyv Software Solutions, Omnipresent Infotech, Majorel, sony india software centre, dhandhania infotech, gislen software,

Right Answer:
The import statement in a Java program is used to include classes and packages from the Java standard library or other libraries, allowing the programmer to use those classes without needing to specify their full package names.

JAVA Java Developer

Ques:- What is batch processing and how to perform batch processing in JDBC?

Asked In :- Ultramain Systems, Orion Innovation,

Right Answer:
Batch processing in JDBC refers to executing multiple SQL statements as a single batch to improve performance and reduce the number of database round trips. To perform batch processing in JDBC, follow these steps:

1. Create a `Connection` object.
2. Create a `Statement` or `PreparedStatement` object.
3. Add multiple SQL statements to the batch using the `addBatch()` method.
4. Execute the batch using the `executeBatch()` method.
5. Optionally, handle the results and exceptions.

Example code snippet:

```java
Connection conn = DriverManager.getConnection(url, user, password);
PreparedStatement pstmt = conn.prepareStatement("INSERT INTO table_name (column1, column2) VALUES (?, ?)");

for (Data data : dataList) {
pstmt.setString(1, data.getColumn1());
pstmt.setString(2, data.getColumn2());
pstmt.addBatch();
}

int[] results = pstmt.executeBatch();
```

JAVA Java Developer

Ques:- How can we store and retrieve images from the database?

Asked In :- Mozilor Technologies, QUALIAN TECHNOLOGIES PVT,

Right Answer:
To store images in a database, you can use a BLOB (Binary Large Object) data type. You can convert the image to a byte array and then insert it into the database. To retrieve the image, you fetch the BLOB data from the database and convert it back to an image format.

Example in Java:
1. **Storing an image:**
```java
PreparedStatement pstmt = connection.prepareStatement("INSERT INTO images (image_data) VALUES (?)");
FileInputStream fis = new FileInputStream(new File("path/to/image.jpg"));
pstmt.setBinaryStream(1, fis, (int) new File("path/to/image.jpg").length());
pstmt.executeUpdate();
```

2. **Retrieving an image:**
```java
PreparedStatement pstmt = connection.prepareStatement("SELECT image_data FROM images WHERE id = ?");
pstmt.setInt(1, imageId);
ResultSet rs = pstmt.executeQuery();
if (rs

JAVA Java Developer

Ques:- Which interface is responsible for transaction management in JDBC?

Asked In :- ProV Infotech Systems, BeeHyv Software Solutions, Gradeup,

Right Answer:
The interface responsible for transaction management in JDBC is `Connection`.

JAVA Java Developer

Ques:- What does the JDBC DatabaseMetaData interface?

Asked In :- Chella Software, Isoft Software Technologies, Finacle Technologies, symphony talent,

Right Answer:
The JDBC `DatabaseMetaData` interface provides methods to retrieve metadata about the database, such as information about its tables, columns, stored procedures, and supported features.

JAVA Java Developer

Ques:- What does the JDBC ResultSetMetaData interface?

Asked In :- FANUC, Thinkitive Technologies, quest global, kaleyra, gislen software, springml, inc.,

Right Answer:
The JDBC `ResultSetMetaData` interface provides methods to retrieve metadata about the columns in a `ResultSet`, such as the number of columns, column names, data types, and whether a column can accept null values.

JAVA Java Developer

Ques:- What does the JDBC ResultSet interface?

Asked In :- C E I India, Torry Harris Integration Solutions, adyen, infocepts, reltio, Blue Bridge Solutions,

Right Answer:
The JDBC ResultSet interface provides methods to retrieve and manipulate the data returned by a SQL query executed against a database. It allows you to navigate through the rows of data, access column values, and update the data if needed.

JAVA Java Developer

Ques:- Give list of Date functions of Sql Server?

Asked In :- I Logix infotech, O Clock Software, Mechlin Technologies, Neo Code, sana commerce,

Right Answer:
1. GETDATE() - Returns the current date and time.
2. CURRENT_TIMESTAMP - Returns the current date and time (same as GETDATE()).
3. DATEADD() - Adds a specified time interval to a date.
4. DATEDIFF() - Returns the difference between two dates.
5. DATENAME() - Returns the name of the specified date part.
6. DATEPART() - Returns the specified part of a date as an integer.
7. CONVERT() - Converts a date to a specified format.
8. FORMAT() - Formats a date value based on a specified format.
9. EOMONTH() - Returns the last day of the month that contains the specified date.
10. YEAR() - Returns the year part of a date.
11. MONTH() - Returns the month part of a date.
12. DAY() - Returns the day part of a date.

Java Developer Javascript

Ques:- What is the difference between mutable and immutable?

Asked In :- E2LOGY SOFTWARE SOLUTIONS, WebReinvent Technologies, DSM SOFT, EvolveWare, Smart TV Broadcasting, Neo Code, paysafe group, aptean, neudesic, bunq,

Right Answer:
Mutable objects can be changed after they are created, while immutable objects cannot be changed once they are created.

JAVA Java Developer Jsp

Ques:- What is hibernate?

Asked In :- Majorel,

Right Answer:
Hibernate is an open-source Object-Relational Mapping (ORM) framework for Java that simplifies database interactions by allowing developers to work with Java objects instead of SQL queries. It manages the mapping of Java classes to database tables and provides features like caching, transaction management, and query capabilities.

JAVA Java Developer

Ques:- What will happen if you are using file reader but didn’t provide try catch for file not found?

Asked In :- C E I India, Chella Software, Coddle Technologies, MRI Software, Finacle Technologies, aptean, carvana, Blue Bridge Solutions,

Right Answer:
If you use a FileReader without a try-catch block for FileNotFoundException, the program will not compile because the exception is a checked exception that must be handled.

Java Developer

Ques:- Can you write init() method in jsp? If yes then where to write?

Asked In :- Canopus Infosystems, Finacle Technologies, Amshuhu, areteans, springml, inc.,

Right Answer:
Yes, you can write the `init()` method in a JSP. It should be placed inside a scriptlet, like this:

```jsp
<%
public void init() {
// Initialization code here
}
%>
```

However, it's more common to use a servlet for initialization tasks.

Java Developer

Ques:- What is Java Beans?

Asked In :- Samsung R&D Institute India, Thinkitive Technologies, Majorel, amphora,

Right Answer:
JavaBeans are reusable software components in Java that follow specific conventions, including having a no-argument constructor, providing getter and setter methods for accessing properties, and being serializable. They are used to encapsulate many objects into a single object (the bean) and can be manipulated in visual development environments.

Java Developer Retail Sales

Ques:- Have you experienced any serious illnesses in the past year?

Asked In :- ARMIA SYSTEMS, Headrun Technologies,

Right Answer:
No, I have not experienced any serious illnesses in the past year.

Java Developer Retail Sales

Ques:- Do you have plans for higher studies?

Asked In :- Agreeya Solutions India, Twilio, Signet Jewelers, the white company, card factory, office shoes, bamboo rose, shoe zone, industrie clothing, jd sports,

Right Answer:
Yes, I plan to pursue higher studies to enhance my skills and knowledge in the field.

Aptitude Java Developer

Ques:- How many times a day do a clock’s hands overlap?

Asked In :- ARMIA SYSTEMS, BeeHyv Software Solutions, paysafe group, aptean, carvana,

Right Answer:

The hands of a clock overlap 22 times a day.

C Java Developer Jsp

Ques:- What is JQuery?

Asked In :- Webtech Developers, InTimeTec VisionSoft, Thinkitive Technologies, pure storage, springml, inc.,

Right Answer:
jQuery is a fast, small, and feature-rich JavaScript library that simplifies HTML document traversal and manipulation, event handling, and animation, making it easier to work with JavaScript in web development.

JAVA Java Developer

Ques:- What are the oops concept?

Asked In :- ARMIA SYSTEMS, Finacle Technologies, Snapsheet,

Right Answer:
The OOP concepts are:

1. **Encapsulation**: Bundling data and methods that operate on that data within a single unit (class) and restricting access to some components.
2. **Abstraction**: Hiding complex implementation details and showing only the essential features of an object.
3. **Inheritance**: Mechanism where one class can inherit fields and methods from another class, promoting code reuse.
4. **Polymorphism**: Ability for different classes to be treated as instances of the same class through a common interface, allowing methods to do different things based on the object that it is acting upon.

A Java Developer is a skilled software professional who specializes in the Java programming language, one of the most popular and enduring languages in the world. They are responsible for a wide range of tasks, from building complex enterprise applications to creating mobile apps and web services. The versatility of Java, coupled with its “write once, run anywhere” philosophy, makes it a preferred choice for a multitude of projects, and a Java Developer’s role is to leverage this power to create high-quality, efficient, and reliable software.

The day-to-day responsibilities of a Java Developer are diverse and often depend on their seniority and the type of project they are working on. They are typically involved in the entire software development lifecycle, which includes:

Design and Development: A developer writes clean, well-documented, and efficient code that adheres to industry standards and best practices. They often work with frameworks like Spring, Hibernate, or Java EE to build the application’s backend logic.
Collaboration: Java Developers work closely with other team members, including product managers, UI/UX designers, and quality assurance testers, to understand requirements and ensure the final product meets the needs of the business and its users.
Testing and Debugging: They are responsible for writing unit tests to ensure the code works as expected and for debugging issues that arise during development or after deployment. This involves using tools to analyze code and identify and fix errors.
Maintenance and Support: A developer’s work doesn’t end after the application is launched. They are often responsible for maintaining existing software, adding new features, and providing technical support to resolve issues and improve performance.
Database Management: Many Java applications interact with databases, so developers need to have a strong understanding of database technologies like SQL and ORM (Object-Relational Mapping) tools.

A Java Developer must be proficient in not only the language itself but also its rich ecosystem of tools, libraries, and frameworks. They must also have a strong grasp of object-oriented principles, data structures, and algorithms. The role requires a strong problem-solving ability, meticulous attention to detail, and a commitment to continuous learning to keep up with the fast-paced evolution of technology. In essence, a Java Developer is a key architect and builder in the digital world, creating the software that powers much of our modern technology.

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