Protechsoft Technologies SQL Developer Interview Questions and Answers

A closure is a function that has access to its outer function's variables, even after the outer function has returned.

• A closure is created when a function is defined inside another function.

• It allows for private variables and functions in JavaScript.

• Closures are used for data hiding, encapsulation, and creating modules.

• Example: function outer() { var x = 10; function inner() { console.log(x); } return inner; } var clos

I am a software developer with experience in various programming languages and frameworks.

• Proficient in Java, C++, and Python

• Familiar with web development using HTML, CSS, and JavaScript

• Experience with database management systems such as MySQL and MongoDB

• Strong problem-solving and analytical skills

• Worked on projects involving machine learning and artificial intelligence

Method overloading is having multiple methods with the same name but different parameters. Method overriding is having a subclass method with the same name and parameters as a superclass method.

• Method overloading is used to provide different ways of calling the same method with different parameters.

• Method overriding is used to provide a specific implementation of a method in a subclass that is already defined in the su...read more

Switch case is used for multiple conditions while if else is used for binary conditions.

• Switch case is faster than if else for multiple conditions.

• If else can handle complex conditions while switch case cannot.

• Switch case can only compare values of the same data type.

• If else can handle null values while switch case cannot.

• Example: switch (day) { case 1: console.log('Monday'); break; case 2: console.log('Tuesday'); brea...read more

Interface and abstract class are both used for abstraction in object-oriented programming.

• An interface is a collection of abstract methods that define a contract for a class to implement.

• An abstract class is a class that cannot be instantiated and may contain abstract methods.

• Interfaces are used to achieve multiple inheritance in Java.

• Abstract classes can have non-abstract methods and instance variables.

• An example of a...read more

Polymorphism is the ability of an object to take on many forms.

• It allows objects of different classes to be treated as if they were objects of the same class.

• It is achieved through method overriding and method overloading.

• Example: A shape class can have multiple subclasses like circle, square, etc. and all can be treated as shapes.

• Example: A method can have different implementations in different classes but with the sa

Inheritance is a mechanism in object-oriented programming where a new class is created by inheriting properties of an existing class.

• Inheritance allows code reusability and saves time and effort in writing new code.

• The existing class is called the parent or base class, and the new class is called the child or derived class.

• The child class inherits all the properties and methods of the parent class and can also add its ...read more

Default case in switch case statement

• Default case is executed when no other case matches the switch expression

• It is optional and can be placed anywhere in the switch statement

• It is often used to handle unexpected input or errors

• It should always be the last case in the switch statement

I am a passionate software developer with a strong background in web development and a love for problem-solving.

• Experienced in HTML, CSS, JavaScript, and various web development frameworks

• Proficient in backend development using languages like Java, Python, and Node.js

• Familiar with database management systems such as MySQL and MongoDB

• Strong problem-solving skills and ability to work well in a team environment

I tend to get overly focused on details, which can sometimes slow down my progress.

• I have a tendency to spend too much time on perfecting small details

• I sometimes struggle with prioritizing tasks due to my focus on details

• I am working on improving my time management skills to balance detail-oriented work with efficiency

Yes, I have received offers from two other companies.

• Received offers from Company A and Company B

• Currently evaluating all offers to make an informed decision

• Considering factors like company culture, growth opportunities, and compensation

I would like to join Google because of their innovative projects and work culture.

• Google is known for its cutting-edge technology and innovative projects.

• They have a strong focus on employee well-being and work-life balance.

• Google offers opportunities for career growth and development.

• The company has a diverse and inclusive work culture.

• Google is a leader in the tech industry with a global presence.

Yes, I have worked in multiple teams in various projects.

• Worked in a team of developers to create a new software application

• Collaborated with designers, testers, and project managers to meet project deadlines

• Participated in daily stand-up meetings to discuss progress and roadblocks

Yes, they are similar.

• All 8 metal balls are of the same material.

• They have the same size and weight.

• They have the same physical properties.

• They are interchangeable in any given situation.