Worldline Global Services Software Engineer Interview Questions and Answers

5 sections in the aptitude

Live coding test about sql and python

Q1. Advance coding round
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Q1. Proper HR discussions
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Q1. Basics of Java OOPS
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How to remove duplicates from an array

Q1. Some basic questions on java
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Q2. One coding question on Java
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Q1. C++ fundamental
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Q2. Reverse linked list
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Q1. You have a list of numbers, now using stream api calculate the sum of all integers in a list ?
Ans. 
Use stream api to calculate sum of integers in a list.
• Use stream() method on the list to create a stream of elements.

• Use mapToInt() method to convert each element to an integer.

• Use sum() method to calculate the sum of all integers.
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Q2. Given two arrays of integers, find the one extra element in second array ? Eg. int[] arr1 = [1,3,7,8]; int[] arr2 = [3,8,7,9,1];
Ans. 
Loop through both arrays and use a hashmap to store frequency of elements, then find the extra element.
• Loop through both arrays and store frequency of elements in a hashmap

• Compare the frequency of elements in both arrays to find the extra element

• Return the extra element found in the second array
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Q1. Write code of palindrome
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Code to check if a given string is a palindrome or not.
• Create a function that takes a string as input

• Remove all non-alphanumeric characters and convert to lowercase

• Compare the original string with its reverse to check for palindrome
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Q2. How to pass data in angular from component to component
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Data can be passed in Angular from component to component using input properties, output properties, services, and state management libraries like NgRx.
• Use @Input decorator to pass data from parent to child component

• Use @Output decorator to emit events from child to parent component

• Use services to share data between components

• Use state management libraries like NgRx for complex data sharing scenarios
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Q1. Write a program Binary Search?
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Binary search is a divide and conquer algorithm that efficiently finds the target value within a sorted array.
• Start by defining the low and high indices of the array.

• Calculate the middle index and compare the target value with the middle element.

• If the target value is less than the middle element, search the left subarray. If greater, search the right subarray.

• Repeat the process until the target value is found or the s
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Q2. What isCICD flow?
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CI/CD flow stands for Continuous Integration/Continuous Deployment flow, which is a software development practice where code changes are automatically built, tested, and deployed.
• CI/CD flow involves automating the process of integrating code changes into a shared repository, running automated tests, and deploying the changes to production.

• Continuous Integration (CI) focuses on automating the build and testing of code c...read more
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Q3. How to handle Enum feature?
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Enums are a feature in programming languages that allow you to define a set of named constants.
• Enums can be used to improve code readability by giving meaningful names to values

• Enums can be used in switch statements to handle different cases

• Enums can have associated values or raw values for more flexibility
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Q4. Singleton handles the Syncronized ?
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Yes, Singleton handles synchronization by ensuring only one instance of a class is created and providing global access to that instance.
• Singleton pattern restricts the instantiation of a class to one object.

• It provides a global point of access to the instance.

• Synchronization can be implemented in the Singleton pattern to ensure thread safety.

• Example: Singleton pattern is commonly used in database connections to ensure
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Q5. What are external Libraries are used in project?
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External libraries are pre-written code that can be imported and used in a project to provide additional functionality.
• External libraries help in reducing development time by providing ready-made solutions for common tasks.

• Examples include React for front-end development, NumPy for scientific computing in Python, and Retrofit for making network calls in Android apps.
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