eClinicalWorks Interview Questions and Answers

Q1. What is immutable class ?
Ans. 
Immutable class is a class whose instances cannot be modified after creation.
• Instances of immutable class cannot be changed once created

• Immutable classes are often used for objects that should not be modified, like dates or strings

• Examples of immutable classes in Java are String, Integer, and LocalDate
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Q2. How create immutable class?
Ans. 
Immutable class can be created by making all fields private and final, providing only getters and no setters.
• Make all fields private and final

• Provide only getters, no setters

• Avoid modifying state within the class
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Q3. What is singleton class
Ans. 
A singleton class is a class that can only have one instance created throughout the entire application.
• Singleton classes are often used for logging, driver objects, caching, thread pools, database connections, etc.

• They have a private constructor to prevent instantiation from other classes.

• They provide a global point of access to the instance.
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Q4. Write program for immutable class
Ans. 
Immutable class is a class whose state cannot be modified after creation.
• Use final keyword to make class immutable

• Make all fields private and final

• Do not provide setter methods

• Return new instances when modifying state
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Q1. Write Immutable class program
Ans. 
Immutable class program in Java
• Use the 'final' keyword to make class immutable

• Make all fields private and final

• Do not provide setter methods, only getter methods

• Ensure deep copy of mutable objects in constructor or getter methods
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Q2. Difference between controller vs restcontroller
Ans. 
Controller is a general term for classes that handle incoming requests, while RestController is specifically for RESTful web services in Spring.
• Controller is a general term for classes that handle incoming requests in a web application.

• RestController is a specialized version of a controller that is used for creating RESTful web services in Spring framework.

• RestController is annotated with @RestController, which combine...read more
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Q3. Can we write controller annotation instead of service annotation
Ans. 
No, controller and service annotations serve different purposes in a software application.
• Controller annotations are used to define the entry points for incoming requests and map them to specific methods in a controller class.

• Service annotations are used to mark a class as a service component that can be injected into other classes for business logic implementation.

• Mixing up controller and service annotations can lead ...read more
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Q1. What === parameter in javascript?
Ans. 
=== is a strict equality operator in JavaScript that checks if two values are equal in type and value.
• === compares two values without type conversion

• Returns true if both values are strictly equal, false otherwise

• Example: 5 === '5' returns false because they are of different types
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Q2. What is difference heap vs stack memory
Ans. 
Heap memory is used for dynamic memory allocation, while stack memory is used for static memory allocation.
• Heap memory is allocated at runtime and can be accessed randomly, while stack memory is allocated at compile time and is accessed in a LIFO order.

• Heap memory is managed manually by the programmer, while stack memory is managed automatically by the system.

• Heap memory is larger in size compared to stack memory, but ...read more
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Q3. What is JSP ?
Ans. 
JSP stands for JavaServer Pages, a technology used for creating dynamic web pages using Java.
• JSP allows embedding Java code in HTML pages

• It is compiled into servlets by the server before execution

• JSP simplifies the process of developing web applications by separating the presentation layer from the business logic
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Q1. In next 5year on position you look to yourself
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Q1. Write a SQL join query
Ans. 
A SQL join query combines rows from two or more tables based on a related column between them.
• Use keywords like INNER JOIN, LEFT JOIN, RIGHT JOIN, or FULL JOIN to specify the type of join

• Specify the columns to join on using ON keyword

• Include the table names and column names in the query
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Q2. What is telnet ?
Ans. 
Telnet is a network protocol used to access and manage devices remotely over a network.
• Telnet allows users to connect to a remote device or server using a command-line interface.

• It is commonly used for troubleshooting network issues, configuring devices, and accessing remote servers.

• Telnet operates on port 23 and transmits data in plain text, making it less secure compared to SSH.

• Example: telnet 192.168.1.1 23
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Q3. What are vpns and working
Ans. 
VPNs are Virtual Private Networks that allow users to securely access a private network over a public network.
• VPNs encrypt data to ensure privacy and security

• They can be used to access region-restricted websites or bypass censorship

• Common VPN protocols include OpenVPN, L2TP/IPsec, and IKEv2
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Q1. How to do technical troubleshooting
Ans. 
Technical troubleshooting involves identifying, isolating, and resolving technical issues to ensure systems are functioning properly.
• Identify the problem by gathering information from the user or system logs

• Isolate the issue by testing different components or configurations

• Resolve the problem by applying solutions based on the root cause

• Document the troubleshooting process and solution for future reference
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Q2. Write left join query
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A left join query combines rows from two tables based on a related column, including all rows from the left table.
• Use the LEFT JOIN keyword in your query

• Specify the columns you want to select from both tables

• Specify the join condition using ON clause

• Example: SELECT * FROM table1 LEFT JOIN table2 ON table1.id = table2.id
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Q1. What is your role in your current organization?
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Q1. Total work Experience
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Q2. What was the current drawing
Ans. 
The current drawing refers to the amount of money being withdrawn from an account.
• The current drawing can be found on the account statement or online banking portal.

• It is important to keep track of current drawings to avoid overdrawing the account.

• Examples of current drawings include ATM withdrawals, checks written, and electronic transfers.
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Logical reasoning, grammar and mathematical problems

Q1. Walk me through your resume
Ans. 
Experienced finance professional with a strong background in budgeting, forecasting, and financial analysis.
• Started career as a financial analyst at XYZ Company

• Managed budgeting process for a team of 50 employees

• Implemented cost-saving initiatives resulting in 10% reduction in expenses

• Led financial forecasting efforts for quarterly reports

• Currently working as a Finance Coordinator at ABC Company
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Q2. Where do you see yourself in 5 years
Ans. 
In 5 years, I see myself as a Finance Manager leading a team of professionals and implementing strategic financial initiatives.
• Advancing to a Finance Manager role

• Leading a team of finance professionals

• Implementing strategic financial initiatives

• Continuing professional development through certifications or further education
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Q3. Why do you think you're a fit candidate for this role
Ans. 
I have a strong background in finance, excellent organizational skills, and a proven track record of successfully managing budgets and financial data.
• Extensive experience in financial analysis and reporting

• Proficient in budget management and forecasting

• Strong attention to detail and accuracy

• Excellent communication and interpersonal skills

• Proven ability to work effectively in a fast-paced environment
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Q4. Who all are there in your family
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Q5. What are your salary expectations for this role
Ans. 
My salary expectations are in line with industry standards and commensurate with my experience and qualifications.
• Research industry standards for Finance Coordinator salaries

• Consider my experience and qualifications when determining salary expectations

• Be open to negotiation based on the overall compensation package offered
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Q1. Java basics and networking
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Q2. MySQL and communication skills
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Q1. What is polymorphism
Ans. 
Polymorphism is the ability of a function or method to behave differently based on the object it is acting upon.
• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• It enables a single interface to be used for different data types or objects.

• Examples include method overloading and method overriding in object-oriented programming.
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Q2. What is difference between class and interface?
Ans. 
Classes can have both implementation and state, while interfaces only have method signatures.
• Classes can have constructors, interfaces cannot

• Classes can have fields, interfaces cannot

• A class can implement multiple interfaces, but can only inherit from one class

• Example: Class 'Car' can have fields like 'color' and 'model', while Interface 'Drivable' only has method signatures like 'start' and 'stop'
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