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Java interview questions on OOP, collections, concurrency, and JVM internals.
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Top Java Interview Questions
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1
Explain the difference between == and .equals()
Hint: Reference vs value comparison
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2
What is the Java Memory Model?
Hint: Heap, stack, garbage collection
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3
How does HashMap work internally?
Hint: Hashing, buckets, collisions
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4
Explain Java multithreading
Hint: Threads, synchronization, locks
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5
What are Java Streams?
Hint: Functional-style operations on collections
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6
Difference between abstract class and interface
Hint: Multiple inheritance, default methods
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