PTC Java Developer Interview Questions and Answers

Q1. About project of previous company
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Q2. Check palindrome and odd of given number
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Q1. Goals for the future
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To become a senior Java developer and contribute to innovative projects in a collaborative team environment.
• Continue learning new technologies and best practices in Java development

• Work on challenging projects to enhance problem-solving skills

• Collaborate with team members to share knowledge and improve code quality
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Q2. How do you think you can impact our company
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I believe my strong Java skills and problem-solving abilities can positively impact the company by improving efficiency and developing innovative solutions.
• I have experience in developing efficient and scalable Java applications, which can help streamline processes within the company.

• I am skilled in identifying and solving complex technical issues, which can contribute to the overall success of projects.

• I am proactive ...read more
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Q1. Try, catch, finally...
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Q2. HTTP families (400,200,500)
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Q1. Questions on Core Java + Java 8 features + Threads + Exceptions + Spring Boots Questions
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Q2. Coding question like combining list of (x,y) coordinate if they overlap
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Q1. Same like previous Round 1 where questions were on Core Java + Java 8 features + Spring boot
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Q2. Coding questions: 1) To implement HashMap 2) find duplicate count 3) from the list of integers find pairs whos sum matches the target. expecting an optimized solution
Ans. 
Implement HashMap, find duplicate count, and find pairs with sum matching target in an optimized way.
• Implement HashMap using arrays and linked lists for collision resolution.

• Use a HashMap to store element counts and find duplicates efficiently.

• Use a two-pointer approach to find pairs with sum matching the target in O(n) time complexity.
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Q1. Dsa question, I don’t remember
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Q2. Check if the sentence is palindrome or not
Ans. 
To check if a sentence is a palindrome, compare it with its reverse form.
• Remove all non-alphanumeric characters and convert the sentence to lowercase.

• Reverse the sentence and compare it with the original sentence to check for palindrome.

• Example: 'A man, a plan, a canal, Panama' becomes 'amanaplanacanalpanama' after removing non-alphanumeric characters and converting to lowercase.
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Q1. Discussion was on Binary tree and tree traversal. Asked me to write binary tree complete program to insert amd traversal of binary tree with few changes on how to insert.
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Q2. In depth discussion on my experience my projects.
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Q1. Java, sql ,springboot
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Reverse string code and reverse array code

Q1. Basic of java, pillar of oops, collection, exception handling etc.
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Q2. What isinheritance
Ans. 
Inheritance is a mechanism in object-oriented programming where a class inherits properties and behaviors from another class.
• Allows a class to inherit attributes and methods from another class

• Promotes code reusability and reduces redundancy

• Creates a parent-child relationship between classes

• Example: Class 'Car' can inherit from class 'Vehicle' and inherit properties like 'speed' and methods like 'drive()'
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Q3. What is encapsulation
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Encapsulation is the concept of bundling data and methods that operate on the data into a single unit, known as a class.
• Encapsulation helps in hiding the internal state of an object and restricting access to it.

• It allows for better control over the data by preventing direct modification from outside the class.

• Access to the data is provided through methods, which can enforce validation rules and ensure data integrity.

• Ex...read more
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Q4. What is polymorphism
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Polymorphism is the ability of a single function or method to operate on different types of data.
• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• There are two types of polymorphism: compile-time (method overloading) and runtime (method overriding).

• Example: Animal superclass with Dog and Cat subclasses. Both Dog and Cat can be treated as Animals.
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Q5. What is abstraction
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Abstraction is the concept of hiding complex implementation details and showing only the necessary features to the user.
• Abstraction allows developers to focus on what an object does rather than how it does it

• It helps in reducing complexity and improving code readability

• Example: In Java, abstract classes and interfaces are used to achieve abstraction
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Q1. Easy Questions - Oops Concept . real life examples Abstract Class Inheritance difference Final vs immutable Spring Concepts - dependency injection,about @autowired
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Q1. English Test - Speaking Fluent Eglish
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