Wemonde Java Developer Interview Questions and Answers

Q1. What is the difference between supervised and unsupervised learning
Ans. 
Supervised learning uses labeled data for training, while unsupervised learning identifies patterns in unlabeled data.
• Supervised learning requires labeled datasets, e.g., predicting house prices based on features like size and location.

• Unsupervised learning works with unlabeled data, e.g., clustering customers based on purchasing behavior.

• In supervised learning, the model is trained to minimize error between predicted ...read more
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Q2. Explain a project where you used python for data analysis
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Q1. What are the access modifiers in Java
Ans. 
Java has four access modifiers: public, private, protected, and default, controlling visibility and accessibility of classes and members.
• public: Accessible from any other class. Example: public class MyClass {}

• private: Accessible only within the same class. Example: private int myVar;

• protected: Accessible within the same package and subclasses. Example: protected void myMethod() {}

• default: No modifier means package-pri...read more
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Q2. What is the difference between checked and unchecked exceptions
Ans. 
Checked exceptions must be handled or declared, while unchecked exceptions do not require explicit handling.
• Checked exceptions are subclasses of Exception, excluding RuntimeException.

• Example: IOException is a checked exception that must be caught or declared.

• Unchecked exceptions are subclasses of RuntimeException.

• Example: NullPointerException is an unchecked exception that can occur at runtime.

• Checked exceptions are ty...read more
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JavaScript, React Js

Q1. How many years of relevant experience
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Q2. What is your current CTC
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Q3. What is your Expectation
Ans. 
I expect a challenging role that fosters growth, collaboration, and innovation while allowing me to contribute meaningfully to projects.
• Opportunities for professional development, such as workshops or courses.

• A collaborative team environment where ideas are shared openly.

• Involvement in innovative projects that push the boundaries of technology.

• Clear career progression paths and regular feedback on performance.
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Q1. What is your Strength
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Q2. What is weakness
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One weakness I have is that I can be overly critical of my own work, which can sometimes lead to self-doubt.
• I tend to overthink things and can be indecisive at times

• I have a tendency to take on too many tasks at once, leading to feeling overwhelmed

• I struggle with public speaking and often get nervous in front of large groups
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Q3. What is your Goal
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Q1. Difference between absolute xpath and relative xpath
Ans. 
Absolute xpath specifies the complete path from the root element to the desired element, while relative xpath specifies the path relative to the current element.
• Absolute xpath starts with a single forward slash (/) and is more specific.

• Relative xpath starts with a double forward slash (//) and is more flexible.

• Absolute xpath is more prone to breaking if the structure of the page changes.

• Relative xpath is easier to main...read more
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40 Minutes. 40 Question in office Test.
20 Questions Programming related and 20 Questions Aptitude

Basic Aptitude question were asked around 20 Question of Aptitude and 20 of basic debugging of C language code. Before aptitude there was a essay writing on "factors which increases the market of E-commerce platforms"

There were 4 coding question and 2 SQL questions. Basic pattern printing question and easy question of leetcode were there in coding and in SQL from "joins" topic.

Same as the previous round more question of Coding and SQL, plus in the starting they would ask about your tech stack and then assign you a stack for the same.

Q1. How Selection Sort Works.
Ans. 
Selection Sort is a simple sorting algorithm that repeatedly selects the smallest element from an unsorted portion and swaps it.
• 1. Start with the first element as the minimum.

• 2. Compare this minimum with the rest of the array to find the smallest element.

• 3. Swap the smallest found element with the first element.

• 4. Move to the next position and repeat the process for the remaining unsorted elements.

• Example: For array [6...read more
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Q2. How JOINs work in MYSQL
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Q3. Diffrence between Left JOIN and Inner JOIN
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Basic knowledge required for the Aptitude Test. You need to understand the questions and their technicality and then each question is very easy.

Need to focus more on the SQL Queries and some average coding skills. This test is used to check the code understanding of the candidate.

Little more complex problems, need to understand the logic and some complex SQL Queries.
More Focus on JOINS in SQL.