SAP Software Developer Interview Questions, Process, and Tips

3 data structure questions. Simple to medium questions. String, Linked list based questions.

SQL questions. I was given some real-life examples of a system and was asked to design the SQL tables for it and normalize the tables.

Q1. Culture fit questions and basic background questions.
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Round duration - 30 minutes
Round difficulty - Easy

The round was an online assessment in which there were 2coding questions and the rest were the basic questions of c, c++ concept and surely it was an easy round and I would suggest you all kindly attempt those coding questions

Q1. 
Reverse Linked List Problem Statement
Given a singly linked list of integers, return the head of the reversed linked list.
Example:
Initial linked list: 1 -> 2 -> 3 -> 4 -> NULL
Reversed link...read more
Ans. Brute Force
The brute force approach is to use recursion. First, we reach the end of the Linked List recursively and at last node, we return the last node, which becomes the new head of the partially reversed Linked List. While coming back from each recursion call we add the current node in the current recursion call to the last node of the partially reversed Linked List and assign the current node to null.
 
Steps:
&...read more
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Round duration - 30 minutes
Round difficulty - Medium

It was the complete coding round based upon the Resume.

Q1. 
Multilevel Inheritance Implementation
Create a series of classes to demonstrate multilevel inheritance.
Explanation:
Create three classes to illustrate multilevel inheritance.
• GrandFather: This clas...read more
Ans. Intuitive Approach
• First, we are creating class Grandfather has an attribute grandfathername after that creating class
• Father has an additional attribute fathername now further creating a class has all the property of Father and additional attribute sonname.
• Now when we call our Father class using super by passing attribute fathername and grandfather name then father class set the value of fathername as Ramesh. It calls i...read more
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Round duration - 30 minutes
Round difficulty - Easy

This was totally based upon you, they judge your confidence, Why SAP, What is SAP, and so on. Why are you choosing SAP WILP rather than doing a normal MCA or MTech degree? Remember they will going to tell you that it’s very hard and all but you have to stick over your words and should show up all your confidence.

Q1. Difference between REST and SOAP services?
Ans. 
REST is lightweight and uses HTTP for communication, while SOAP is XML-based and has a more complex messaging format.
• REST is simpler and easier to use than SOAP.

• SOAP is more secure and reliable than REST.

• REST uses HTTP methods like GET, POST, PUT, DELETE, while SOAP uses XML messaging format.

• REST is better suited for web applications, while SOAP is better suited for enterprise-level applications.

• Examples of RESTful ser...read more
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Q2. Use of 'finally' block in Java? When finally" block is not called in which cases?
Ans. 
The 'finally' block in Java is used to execute code after try-catch blocks, even if an exception is thrown.
• The 'finally' block is always executed, regardless of whether an exception is thrown or caught.

• It is used to release resources like database connections, network connections, etc.

• If the JVM exits while the try or catch code is being executed, then the 'finally' block may not execute.

• If the thread executing the try...read more
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Q3. Difference between StringBuilder and StringBuffer classes in Java?
Ans. 
StringBuilder is not thread-safe while StringBuffer is thread-safe.
• StringBuilder is faster than StringBuffer in single-threaded environments.

• StringBuffer is synchronized, making it safe to use in multi-threaded environments.

• Both classes are used to manipulate strings, but StringBuilder is preferred for single-threaded environments.

• Example: StringBuilder sb = new StringBuilder("Hello");

• Example: StringBuffer sb = new Str
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Q4. Difference between ArrayList and LinkedList? Their other implementations? pros and cons?
Ans. 
ArrayList and LinkedList are both implementations of List interface in Java. ArrayList is backed by an array while LinkedList is backed by a doubly linked list.
• ArrayList provides constant time access to elements while LinkedList provides constant time insertion and deletion at any position.

• ArrayList is better for random access and LinkedList is better for sequential access.

• Other implementations of List interface includ...read more
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Q1. Types of class loaders in Java?
Ans. 
Java has three types of class loaders: Bootstrap, Extension, and System.
• Bootstrap class loader loads core Java classes from rt.jar and other core libraries.

• Extension class loader loads classes from the extensions directory.

• System class loader loads classes from the classpath.

• Custom class loaders can also be created to load classes from non-standard locations.
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Q2. Which data structures the candidate is confident in development and why?
Ans. 
I am confident in developing arrays, linked lists, and hash tables.
• Arrays are simple and efficient for storing and accessing data.

• Linked lists are useful for dynamic data structures and efficient insertion/deletion.

• Hash tables provide fast access to data with key-value pairs.
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Q3. Why String" class is immutable in Java environment?
Ans. 
String class is immutable in Java to ensure security, thread-safety, and performance.
• Immutable objects are thread-safe as they cannot be modified by multiple threads simultaneously.

• Immutable objects are also secure as they cannot be modified by malicious code.

• String pool is possible because of immutability, which improves performance by reducing memory usage.

• StringBuffer and StringBuilder classes are used for mutable s
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Q4. How does Java hashmap" works?
Ans. 
Java hashmap is a data structure that stores key-value pairs and provides constant time complexity for basic operations.
• Hashmap uses hashing to store and retrieve values based on their keys.

• It allows null values and only one null key.

• It implements the Map interface and provides methods like put(), get(), remove(), containsKey(), and size().

• The initial capacity and load factor can be specified while creating a hashmap.

• H...read more
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What is biggest number that can be formed using four 2s?

Q1. Reverse linked list
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Q2. Remove node in linked list
Ans. 
To remove a node in a linked list, update the previous node's next pointer to skip the node to be removed.
• Traverse the linked list to find the node to be removed

• Update the previous node's next pointer to skip the node to be removed

• Free the memory allocated to the node to be removed
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Core java question and deep discussion

Round duration - 60 minutes
Round difficulty - Medium

It consisted of 10 MCQ questions based on OOPs(C++ and Java-based), C(based on pointers), and 2 coding questions.

Q1. 
Longest Unique Substring Problem Statement
Given a string input of length 'n', your task is to determine the length of the longest substring that contains no repeating characters.
Explanation:
A substri...read more
Ans. All Substring Approach
• Create all the substrings of the string.
• For every substring, check if it consists of unique characters.
• To check if the substring has duplicate characters, we will use a HashSet. We will iterate through all the characters in the string and put them into the set one by one. Before putting one character, we check if the set already contains it. If it does, the substring doesn't contain unique charact...read more
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Round duration - 30-40 minutes
Round difficulty - Medium

Q1. 
Duplicate Integer in Array
Given an array ARR of size N, containing each number between 1 and N-1 at least once, identify the single integer that appears twice.
Input:
The first line contains an integer...read more
Ans. Brute Force
A simple method is to traverse through the array ARR to find the frequency of each number in the given array, and we will check if the frequency of the number is more than 1.
 
Therefore, our approach will be to iterate currentNumber from 1 to N - 1. In each iteration, we will traverse through the array ARR to find the frequency of currentNumber in the array. We will check if the frequency is more than 1,...read more
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Round duration - 30 - 40 minutes
Round difficulty - Medium

Q1. 
Binary Pattern Problem Statement
Given an input integer N, your task is to print a binary pattern as follows:
Example:
Input:
N = 4
Output:
1111
000
11
0
Explanation:
The first line contains 'N' 1s. T...read more
Ans. Iterative
In the pattern, every even-numbered line is filled with 0's, and the odd-numbered line is filled with 1's and we have total N lines. 

We can run a for loop from 0 to N for each line and inside that for loop we can run again another for loop till the N - i times where ‘i’ is the line number. respective of line number we can print the 0 or 1.  
Space Complexity: O(1)Explanation:
O(1)
 
There will not...read more
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Round duration - 15 minutes
Round difficulty - Easy