CedCommerce Interview Questions and Answers

Print a specific pattern using any programming language.

Q1. What is a class in Object-Oriented Programming (OOP)?
Ans. 
A class in OOP is a blueprint for creating objects, defining their properties and behaviors.
• Classes are templates for creating objects in OOP

• They define the properties (attributes) and behaviors (methods) of objects

• Objects are instances of classes, each with its own unique data

• Inheritance allows classes to inherit properties and behaviors from other classes

• Encapsulation ensures that the data is hidden and can only be a...read more
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Q2. What is the difference between an abstract class and an interface?
Ans. 
Abstract class can have both abstract and non-abstract methods, while interface can only have abstract methods.
• Abstract class can have constructors, fields, and methods, while interface cannot have any implementation.

• A class can only extend one abstract class, but can implement multiple interfaces.

• Abstract classes are used to define common characteristics of subclasses, while interfaces are used to define contracts for...read more
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Q3. What is joining and creating an inner join query?
Ans. 
Joining is combining data from two or more tables based on a related column, while an inner join query retrieves only the matching records.
• Joining is used to combine data from multiple tables in a database.

• Inner join query retrieves only the records that have matching values in both tables.

• Syntax for inner join: SELECT columns FROM table1 INNER JOIN table2 ON table1.column = table2.column;

• Example: SELECT orders.order_i...read more
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Q1. Introduce yourself
Ans. 
I am a Java Developer with 5 years of experience in developing web applications using Java, Spring, and Hibernate.
• 5 years of experience in Java development

• Proficient in Spring and Hibernate frameworks

• Strong understanding of web application development
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Q2. Tell me about the project you worked on in your previous company and the role you played as part of the team and your day to day responsibilities as a Java Developer in the project
Ans. 
Developed a web-based inventory management system using Java, Spring, and Hibernate
• Designed and implemented database schema using Hibernate

• Developed RESTful APIs using Spring framework

• Worked on front-end development using HTML, CSS, and JavaScript

• Collaborated with team members to troubleshoot and resolve issues

• Participated in code reviews and testing
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Q3. What are Interfaces and Abstract classed in Java and code an example of an interface on Notepad
Ans. 
Interfaces and Abstract classes in Java are used for achieving abstraction and defining contracts for classes to implement.
• Interfaces in Java are like blueprints for classes, defining methods that must be implemented by classes that implement the interface.

• Abstract classes are classes that cannot be instantiated and can have both abstract and concrete methods.

• Example of an interface in Java: public interface Shape { ...read more
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Q4. You are given a string, name and an integer which is year of birth. You need to print the reverse of year of birth followed by the reverse of name.
Ans. 
Reverse the year of birth and name, then print them in that order.
• Reverse the year of birth using StringBuilder.reverse() method

• Reverse the name using StringBuilder.reverse() method

• Print the reversed year of birth followed by the reversed name
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Q5. What are Threads in Java
Ans. 
Threads in Java are lightweight sub-processes that allow concurrent execution within a single process.
• Threads allow multiple tasks to be executed simultaneously in a Java program.

• Threads share the same memory space and resources within a process.

• Example: Creating a new thread using the Thread class or implementing the Runnable interface.
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Q1. Explain briefly about your project at your previous company
Ans. 
Developed a web application for inventory management system using Java Spring framework
• Used Java Spring framework for backend development

• Implemented RESTful APIs for communication between frontend and backend

• Utilized MySQL database for storing inventory data
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Q2. Given a ArrayList of String containing some name with some name repeated. Write the code on a notepad printing only the single occurrence of each name in the ArrayList. iImplement the same using Java 8 Str...read more
Ans. 
Using Java 8 Streams API to print single occurrences of names in an ArrayList of Strings.
• Use stream() method on the ArrayList to create a stream of elements.

• Use filter() method to filter out elements that occur more than once.

• Use distinct() method to get only unique elements.

• Use forEach() method to print each unique element.
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Q3. Given a ArrayList of String containing some names with some repeated names. Write the code on a notepad printing each name and the number of occurrences of each name in the ArrayList
Ans. 
Code to print each name and the number of occurrences in an ArrayList of Strings.
• Iterate through the ArrayList and use a HashMap to store the count of each name.

• Print each name along with its count from the HashMap.
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Q4. What are lambda expressions in Java
Ans. 
Lambda expressions in Java are a concise way to represent anonymous functions.
• Lambda expressions are used to provide implementation of functional interfaces.

• They enable you to treat functionality as a method argument, or code as data.

• Syntax: (parameters) -> expression or (parameters) -> { statements; }

• Example: (int a, int b) -> a + b
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Q5. What are functional interfaces in Java
Ans. 
Functional interfaces in Java are interfaces with only one abstract method, used for lambda expressions and functional programming.
• Functional interfaces have only one abstract method, but can have multiple default or static methods.

• They are used for lambda expressions and functional programming in Java.

• Examples include java.lang.Runnable, java.util.Comparator, and java.util.function.Function.
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Q6. What are Streams in Java
Ans. 
Streams in Java are sequences of elements that support functional-style operations such as filter, map, reduce, etc.
• Streams are not data structures, but rather a way to interact with collections of objects.

• They allow for efficient processing of large amounts of data.

• Streams can be sequential or parallel, allowing for concurrent processing.

• Example: List names = Arrays.asList("Alice", "Bob", "Charlie"); Stream stream = n
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Q7. Do you have any questions for me
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Q1. Tell me about yourself
Ans. 
I am a Java Developer with 5 years of experience in developing web applications and implementing solutions using Java technologies.
• 5 years of experience in Java development

• Strong knowledge of web application development

• Experience in implementing solutions using Java technologies
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Q2. Few questions related to my education and my placements
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Q3. What was your CTC at your previous company
Ans. 
My previous CTC was confidential as per company policy.
• CTC was confidential as per company policy

• I am unable to disclose my previous CTC

• Previous CTC information is not available
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Q4. Do you have any questions for me
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Q1. What is runtime polymorphism, and can you provide a code example to illustrate it?
Ans. 
Runtime polymorphism allows a subclass to provide a specific implementation of a method that is already provided by its parent class.
• Runtime polymorphism is achieved through method overriding, where a subclass provides its own implementation of a method that is already defined in its superclass.

• The method to be overridden must have the same name, return type, and parameters in both the superclass and subclass.

• When an o...read more
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Q2. Streams in java
Ans. 
Streams in Java provide a way to process collections of objects in a functional style.
• Streams are sequences of elements that support various operations like filter, map, reduce, etc.

• They can be created from collections, arrays, or generate elements dynamically.

• Streams can be sequential or parallel, allowing for efficient processing of large datasets.

• Example: List<String> names = Arrays.asList("Alice", "Bob", "Cha...read more
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Q3. How do we create threads in Java, and how do we invoke them?
Ans. 
Threads in Java are created by extending the Thread class or implementing the Runnable interface, and invoked using the start() method.
• Threads can be created by extending the Thread class and overriding the run() method.

• Threads can also be created by implementing the Runnable interface and passing an instance of the class to a Thread object.

• Threads are invoked by calling the start() method on the Thread object.
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Q4. What is a Rest Template and how is it used?
Ans. 
Rest Template is a class in Spring that simplifies making HTTP requests and handling responses.
• Rest Template is part of the Spring framework in Java.

• It can be used to make HTTP requests to RESTful web services.

• It simplifies the process of making HTTP calls and handling responses.

• Rest Template can handle GET, POST, PUT, DELETE, etc. requests.

• Example: RestTemplate restTemplate = new RestTemplate();
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Q1. Basic questions ... tell me about yourself? projects? some quizes, some coding snippets
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Q1. Print all str in arrays
Ans. 
Print all strings in an array
• Use a loop to iterate through the array

• Print each string in the array
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Q2. Print the missing number from the range 1 to 100;
Ans. 
Use the formula for sum of natural numbers to find the missing number.
• Calculate the sum of numbers from 1 to 100 using the formula n*(n+1)/2

• Find the actual sum of numbers from 1 to 100

• Subtract the actual sum from the calculated sum to find the missing number
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Q3. How to converts stack to heap
Ans. 
To convert a stack to a heap, you can use a sorting algorithm like heapify.
• Use a sorting algorithm like heapify to rearrange the elements in the stack into a heap structure.

• Heapify the stack by starting from the last non-leaf node and moving up the tree.

• After heapifying the stack, the elements will be in a heap structure with the root node containing the maximum value.
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Q4. Project and dbms question
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Q1. Array was given apply permutation combination and give biggest number
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Q1. Difference between list and touple
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Q2. Difference between datalake and datawarehouse
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Q1. Self Introduction
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Q2. Twilio Framework
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Q1. Related to Django Framework
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Q2. Related to Twilio Framework
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Job Roles and Responsibility & Salary Discussion

Q1. Oops concept asked
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Q2. Springboot annotations
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Q1. Project details simply
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Q2. Springboot related
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Q1. Easy about salary
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Q2. Details about asked
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Q1. Java related questions.
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Q2. SQL joins questions
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