1. difference between overloading and overriding,oop's concept,multithreading concept,collection's Framework
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How hashmap works internally?
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to return duplicate characters from a string or return false if no duplicates are found.
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Java 8 latest features specially multithreading .-> completeble future
questions focused on basics of java, few algorithmic questions , multithreading.
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What is Jenkins?
Can you explain the difference between an Abstract Class and an Interface, and in what scenario would you choose one over the other in a Spring Boot application?
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