Proteus Technologies Interview Questions and Answers

Q1. Opps concept was asked
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Q2. Basic questions based on core java
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As salary is less interview was way easier than any other company
Programs on prime number, Fibonacci series,factorial,gcd etc.

Q1. Difference between hashset and linkedhashset
Ans. 
HashSet is an unordered collection while LinkedHashSet maintains insertion order.
• HashSet does not maintain insertion order, LinkedHashSet maintains insertion order.

• HashSet does not allow duplicate elements, LinkedHashSet allows duplicate elements.

• HashSet uses hashing mechanism to store elements, LinkedHashSet uses a doubly linked list to maintain order.
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Q2. What is oop? And its concepts
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OOP stands for Object-Oriented Programming, a programming paradigm based on the concept of objects.
• OOP focuses on creating objects that contain data and methods to manipulate that data.

• Key concepts include encapsulation, inheritance, and polymorphism.

• Encapsulation involves bundling data and methods that operate on the data into a single unit.

• Inheritance allows classes to inherit attributes and methods from other classe...read more
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Q3. What are the ways of creating thread
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Ways of creating threads include extending the Thread class, implementing the Runnable interface, and using Executor framework.
• Extending the Thread class: Create a new class that extends the Thread class and override the run() method.

• Implementing the Runnable interface: Create a class that implements the Runnable interface and implement the run() method.

• Using Executor framework: Create a thread pool using Executor fram
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Q4. How jdbc works drives of jdbc?
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JDBC (Java Database Connectivity) is a Java API that allows Java programs to interact with databases.
• JDBC uses a driver manager to load the appropriate driver for the specific database being accessed.

• It establishes a connection to the database using the DriverManager class.

• SQL queries are executed using Statement, PreparedStatement, or CallableStatement objects.

• ResultSets are used to retrieve data from the database.

• Tra...read more
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Q5. What is wrapper class?
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Wrapper class is a class that wraps around a primitive data type and provides additional methods and functionalities.
• Wrapper classes in Java are used to convert primitive data types into objects.

• They provide methods to perform various operations on the data, such as conversion, comparison, and manipulation.

• Examples of wrapper classes in Java include Integer, Double, Boolean, etc.
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Q6. What are packages?
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Packages are a way of organizing classes and interfaces in a logical structure in Java.
• Packages help in avoiding naming conflicts by grouping related classes and interfaces together.

• Packages can be nested within other packages.

• Packages are declared using the 'package' keyword at the beginning of a Java file.

• Example: 'package com.example.myproject;'
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Q7. Life cycle of servlet & jsp?
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Servlet and JSP have different life cycles. Servlet is initialized, service method is called, and then destroyed. JSP is translated to servlet, initialized, service method is called, and then destroyed.
• Servlet life cycle: Initialization, service method invocation, destruction.

• JSP life cycle: Translation to servlet, initialization, service method invocation, destruction.
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Q8. What is deadlock condition in multi threading and how to prevent it?
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Deadlock in multithreading occurs when two or more threads are waiting for each other to release resources, causing them to be stuck indefinitely.
• Deadlock can be prevented by using proper synchronization techniques like avoiding nested locks, using timeouts, and implementing a deadlock detection algorithm.

• One common example of deadlock is the dining philosophers problem, where multiple philosophers are sitting at a tab...read more
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Q1. Introduce yourself
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Q2. Why you want to join our company
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Q3. What are primary and secondary goals
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Primary goals are main objectives to be achieved, while secondary goals are additional objectives that support the primary goals.
• Primary goals are the main objectives that an individual or organization aims to achieve.

• Secondary goals are additional objectives that support the primary goals.

• Primary goals are usually more critical and have higher priority than secondary goals.

• Examples: Primary goal of a company may be to...read more
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Q4. How you will be an asset to our organisation
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Q1. Share details of your previous job.
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Q2. What are your salary expectations?
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Q3. What is your family background?
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Q4. Tell me about yourself.
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Q1. Technical Round, Salary Discussion
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Q1. Basic question regarding programming
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