Hitachi Digital Services Software Engineer Interview Questions and Answers

Q1. All the questions on OOPS, Shell script, linux, c, C++, database
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Q1. Advanced questions on above areas
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Coding question, reasoning, english, math, very easy

Q1. Tell me about yourself
Ans. 
I am a software engineer with 5 years of experience in developing web applications using Java, Spring Boot, and Angular.
• 5 years of experience in software development

• Proficient in Java, Spring Boot, and Angular

• Strong problem-solving skills

• Experience working in Agile development environment

• Passionate about learning new technologies
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Q2. Technical experties and final year project
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Aptitude questions followed by two coding questions.

Two coding questions followed by a discussion on projects.

Three coding questions and inquiries related to Data Structures and Algorithms (DSA), Object-Oriented Programming (OOP), and project-related topics.

Solely 2 coding question

Q1. Difference between composition and aggregation
Ans. 
Composition is a strong relationship where the child object does not exist independently of the parent object, while aggregation is a weak relationship where the child object can exist independently of the parent object.
• Composition is a 'has-a' relationship, where the child object is part of the parent object.

• Aggregation is a 'has-a' relationship, where the child object is not part of the parent object and can exist in...read more
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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. 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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