Automatic Data Processing (ADP) Full Stack Software Developer Interview Questions and Answers

So basically the questions were from strings, arrays, bitwise operators and some mathematical logic based questions. There were 10 questions and they will provide you a laptop and you have to complete all of them in 3 hours (java, c++)
Just be prepared on the above mentioned topics the questions were of easy level if your concept is clear you can crack it easily then there will one more round there they will ask theoretical questions once these both technical rounds are clear you're all set to go for HR round. So this is for 1-2yrs exp guys for freshers they also have to go through aptitude round and question pattern is similar

Q1. Basic oops concepts some tricky ques
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Q2. Questions from collection framework
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Q3. Multithreading basic questions
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Q1. Basic hr questions
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It was an 1 and half hour test basics of aptitude were asked

Q1. Questions related to 3GPP charging systems and protocols
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Asked me to write code on paper for count inversions

Q1. Background about me
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Q2. 2 DSA questions
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Q1. Java basic questions.
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Q2. Rest basics methods like get, post, put, delete etc
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Q3. Given a directory name, write a program to return a list of all .tst files present in the directory and its sub directories.
Ans. 
Program to return list of .tst files in given directory and subdirectories
• Use recursion to traverse through all directories and subdirectories

• Check if each file has .tst extension and add to list if true

• Use built-in functions like os.listdir() and os.path.splitext() in Python
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Q1. Difference between == and equals
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The '==' operator is used for comparing values of primitive data types, while the 'equals' method is used for comparing objects in Java.
• Use '==' to compare primitive data types like int, char, boolean, etc.

• Use 'equals' method to compare objects like Strings, Lists, etc.

• Example: int a = 5; int b = 5; if(a == b) { // true }

• Example: String str1 = 'hello'; String str2 = 'hello'; if(str1.equals(str2)) { // true }
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Q2. Use case of abstract class and interfaces
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Abstract classes are used to provide a common base for multiple classes, while interfaces define a contract for classes to implement.
• Abstract classes can contain both abstract and concrete methods, while interfaces can only have abstract methods.

• Abstract classes can have constructors, while interfaces cannot.

• Interfaces allow for multiple inheritance, while classes can only inherit from one abstract class.

• Abstract class...read more
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Q3. Singleton design pattern. Explain and implement (thread safe)
Ans. 
Singleton design pattern ensures a class has only one instance and provides a global point of access to it.
• Ensure a private static instance variable in the class.

• Provide a public static method to access the instance, creating it if necessary.

• Use synchronized keyword or double-checked locking to make it thread-safe.
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Q4. Merge sort. Explain and implement.
Ans. 
Merge sort is a divide and conquer algorithm that divides the input array into two halves, sorts each half, and then merges the sorted halves.
• Divide the array into two halves

• Recursively sort each half

• Merge the sorted halves back together
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Q1. Explain MVC architecture flow
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MVC is a software architecture pattern that separates an application into three interconnected components: Model, View, and Controller.
• Model represents the data and business logic of the application

• View is responsible for rendering the user interface

• Controller handles user input and updates the model and view accordingly

• MVC promotes separation of concerns and modularity

• MVC is widely used in web development frameworks l
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Q2. Explain MVVM architecture flow and reason for its use
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MVVM is a software architecture pattern that separates the user interface from the business logic.
• MVVM stands for Model-View-ViewModel

• Model represents the data and business logic

• View represents the user interface

• ViewModel acts as a mediator between the View and Model

• ViewModel exposes data and commands to the View

• MVVM is used to improve code maintainability, testability, and separation of concerns
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