Have you ever used the lock class (ReentrantLock)? Have you ever used CountDownLatch or Barrier?
Java Backend Developer Interview Questions
320 java backend developer interview questions shared by candidates
Can a stream be reused? i.e. can you try to finalise a stream twice? i.e. can you call collect on a stream twice?
How do you find using annotations? Do you like it? What is the tradeoff?
How do you guarantee the security of the system?
How do you find Java's performance?
What Java, JVM, .class, bytecode other basic question
what is Collections, HahMap What is hashing? how to avoid collision while hashing. Write a simple hash function
Java,java8 and its features, springboot and microservices concepts along with main core java and stream api coding
implement a cache using LRU (including code implementation)
what is classloader
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