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Java Development Engineer Interview Questions

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28 java development engineer interview questions shared by candidates

on streams java-8 , a onpaper question to merge 2 lists , new java features ,diff between callable and runnable ,future and completable future and completable future functions , thread pools and types of thread pools , micro service design patterns , spring boot related questions on api configs ,how to use a different embedded server other than default tomcat server .
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Software Development Engineer (SDE) JAVA

Interviewed at Mphasis

3.4★
Oct 13, 2025

on streams java-8 , a onpaper question to merge 2 lists , new java features ,diff between callable and runnable ,future and completable future and completable future functions , thread pools and types of thread pools , micro service design patterns , spring boot related questions on api configs ,how to use a different embedded server other than default tomcat server .

3. Write a method that takes two collections of characters as a parameters and returns a new Set of distinct elements common between the two collections. // Give me the intersection of common elements between two data sets. // ['a', 'a', 'c', 'd'], ['a', 'c'] // -> ['a', 'c'] // ['a', 'a', 'c', 'd'], ['a', 'a', 'c'] // -> ['a','c']
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Software Development Engineer In Test (Java Or C++)

Interviewed at Spoken Communications

3.9★
Sep 1, 2017

3. Write a method that takes two collections of characters as a parameters and returns a new Set of distinct elements common between the two collections. // Give me the intersection of common elements between two data sets. // ['a', 'a', 'c', 'd'], ['a', 'c'] // -> ['a', 'c'] // ['a', 'a', 'c', 'd'], ['a', 'a', 'c'] // -> ['a','c']

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