Java Interview Questions

Q61 Explain Java bytecode. Generate → Q62 How does HashMap handle collisions? Generate → Q63 What is ConcurrentModificationException? Generate → Q64 How does ConcurrentHashMap achieve thread safety? Generate → Q65 Explain ForkJoinPool. Generate → Q66 What is CompletableFuture in Java? Generate → Q67 What is parallel stream? Generate → Q68 Explain design patterns used in Java. Generate → Q69 What is singleton pattern and its implementations? ✓ Answered → Q70 Explain double-checked locking. Generate → Q71 What is Java NIO? Generate → Q72 What is the difference between NIO and IO? Generate → Q73 Explain reflection performance impact. Generate → Q74 What is Java instrumentation? Generate → Q75 Explain Java modules system (JPMS). Generate → Q76 What is records feature in Java? Generate → Q77 Explain sealed classes in Java. ✓ Answered → Q78 What is virtual threads (Project Loom)? Generate → Q79 Explain memory leaks in Java. ✓ Answered → Q80 How to profile Java applications? Generate →