eClinicalWorks 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. 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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Questions on Java, OOPs, Springboot, hibernate, JSP,J2EE, and SQL. Coding on DSA easy and one 3sql query.

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
Ans. 
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. Oops ,sql,MySQL, written test
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