Automatic Data Processing (ADP) Application Developer Interview Questions and Answers

Q1. Difference between class & interface
Ans. 
Classes can have both implementation and data members, while interfaces can only have method signatures.
• Classes can have constructors, interfaces cannot.

• Classes can have access modifiers for their members, interfaces cannot.

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

• Interfaces are used to achieve abstraction and multiple inheritance in Java.

• Example: Class 'Animal' can have methods li...read more
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Q1. About current project
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Q1. Stacks queues data structures
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Asked QRE question and some query questions

Q1. Introduce yourself
Ans. 
I am a passionate application developer with experience in creating innovative solutions for various industries.
• Experienced in developing web and mobile applications using languages such as Java, JavaScript, and Swift

• Proficient in database management and integration with applications

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

• Familiar with Agile development methodologies and continuous integr
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Q2. What are the technology you are familiar with
Ans. 
I am familiar with a variety of technologies including Java, Python, SQL, HTML, CSS, JavaScript, and Git.
• Java

• Python

• SQL

• HTML

• CSS

• JavaScript

• Git
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Q1. No of days workers do like A works 10 days B works 10 days
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Q2. Graph based question
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Q1. Merge two sorted arrays
Ans. 
Merge two sorted arrays into a single sorted array
• Create a new array to store the merged result

• Use two pointers to iterate through both arrays and compare elements

• Add the smaller element to the new array and move the pointer for that array
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Q2. Max heap based question
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Q1. Maximum length of subarray of given sum
Ans. 
Find the maximum length of a subarray with a given sum in an array.
• Use a hashmap to store the running sum and its corresponding index.

• Iterate through the array and update the hashmap with the running sum.

• Check if the difference between the current sum and the target sum exists in the hashmap to find the subarray length.
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Q2. Oops implementation question not theory question
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MCQ and DSA questions

Q1. DSA recursive question
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Q2. Logical question
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Q1. Intersection of linked list
Ans. 
Intersection of linked list is finding the common node where two linked lists merge.
• Traverse both linked lists to find their lengths

• Align the longer list's pointer to match the length of the shorter list

• Iterate through both lists simultaneously to find the intersection node
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1 hour - Coding question-hard type palindrome type question , 10 MCQs including aptitude, math and paragraph question and finally a RESTAPI question on hackerrank platform

Q1. Resume scrutiny about projects and internship
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Q2. There N rooms in a hotel so customers will check-in and check-out a rooms simultaneously so which type of data structure you implement and it should be efficient and extension of this prebooking will also ...read more
Ans. 
To efficiently manage room bookings and prebookings in a hotel, a priority queue data structure can be implemented.
• A priority queue can be used to prioritize room bookings based on check-in dates.

• When a customer checks out, the room becomes available and can be assigned to the next customer in the priority queue.

• Prebookings can be stored separately and checked against the availability of rooms before assigning them to ...read more
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Q3. There are 25 horses in which you need to find out the fastest 3 horses. you can conduct a race among at most 5 horses to find out relative speed. At no point, you can find out the actual speed of the horse...read more
Ans. 
Minimum 7 races required to find the top 3 fastest horses.
• Divide the 25 horses into 5 groups of 5 horses each.

• Conduct a race among the horses in each group to determine the fastest horse in each group.

• Take the top 2 horses from each group and conduct a race among them to determine the fastest horse overall.

• The winner of this race is the fastest horse.

• Now, take the second-place horse from the final race and the second-p...read more
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Q4. There is snail which has to climb a ramp of some slope with length of 30ft while climbing the ramp the snail moves 3ft/hour up and simultaneously moves 2ft/hour down so in how much time it will take to cl...read more
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Q1. You have given array of numbers in which you need to write an algorithm to sort them (preferably in java)
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Q2. SQL-QUERY, There is a department table with department name ,department ID and with staff members ID who are working in department and also there is a Staff members table with staff member name, staff memb...read more
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Q3. How do you measure 4 liters with a 5 liters and 3 liters container
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