JAVA Interview Questions and Answers

+2 votes

Q: How do you find if JVM is 32-bit or 64-bit from Java Program?

asked Jan 24, 2020 in JAVA by rahuljain1

+1 vote

Q: What is -XX:+UseCompressedOops JVM option? Why use it?

asked Jan 24, 2020 in JAVA by rahuljain1

+1 vote

Q: How do WeakHashMap works?

asked Jan 24, 2020 in JAVA by rahuljain1

+1 vote

Q: A difference between WeakReference and SoftReference in Java?

asked Jan 24, 2020 in JAVA by rahuljain1

+1 vote

Q: What is the size of an int variable in 32-bit and 64-bit JVM?

asked Jan 24, 2020 in JAVA by rahuljain1

+1 vote

Q: What is The difference between Serial and Parallel Garbage Collector?

asked Jan 24, 2020 in JAVA by rahuljain1

+1 vote

Q: What is constructor chaining in Java?

asked Jan 24, 2020 in JAVA by rahuljain1

+1 vote

Q: Can we use String in the switch case?

asked Jan 24, 2020 in JAVA by rahuljain1

+2 votes

Q: Why is String Immutable in Java?

asked Jan 24, 2020 in JAVA by rahuljain1

+1 vote

Q: Which one will take more memory, an int or Integer?

asked Jan 24, 2020 in JAVA by rahuljain1

+1 vote

Q: What will this return 3*0.1 == 0.3? true or false?

asked Jan 24, 2020 in JAVA by rahuljain1

+1 vote

Q: Can I store a double value in a long variable without casting?

asked Jan 24, 2020 in JAVA by rahuljain1

+1 vote

Q: Difference between a = a + b and a += b ?

asked Jan 24, 2020 in JAVA by rahuljain1

+1 vote

Q: Is ++ operator is thread-safe in Java?

asked Jan 24, 2020 in JAVA by rahuljain1

+1 vote

Q: Which class contains clone method? Cloneable or Object?

asked Jan 24, 2020 in JAVA by rahuljain1

+1 vote

Q: Can we cast an int value into byte variable? what will happen if the value of int is larger than byte?

asked Jan 24, 2020 in JAVA by rahuljain1

0 votes

Q: How do you convert bytes to String?

asked Jan 24, 2020 in JAVA by rahuljain1

0 votes

Q: What is the right data type to represent a price in Java?

asked Jan 24, 2020 in JAVA by rahuljain1

+1 vote

Q: Can we create an Immutable object, which contains a mutable object?

asked Jan 24, 2020 in JAVA by rahuljain1

+1 vote

Q: What is an immutable object? How do you create an Immutable object in Java?

asked Jan 24, 2020 in JAVA by rahuljain1

0 votes

Q: The difference between sleep and wait in Java?

asked Jan 24, 2020 in JAVA by rahuljain1

0 votes

Q: Write code for thread-safe Singleton in Java?

asked Jan 24, 2020 in JAVA by rahuljain1

0 votes

Q: Write wait-notify code for producer-consumer problem?

asked Jan 24, 2020 in JAVA by rahuljain1

0 votes

Q: What is a thread local variable in Java?

asked Jan 24, 2020 in JAVA by rahuljain1

0 votes

Q: is Swing thread-safe?

asked Jan 24, 2020 in JAVA by rahuljain1

0 votes

Q: How do you take thread dump in Java?

asked Jan 24, 2020 in JAVA by rahuljain1

0 votes

Q: What is busy spin? Why should you use it?

asked Jan 24, 2020 in JAVA by rahuljain1

0 votes

Q: What is false sharing in the context of multi-threading?

asked Jan 24, 2020 in JAVA by rahuljain1

0 votes

Q: How do you call wait() method? using if block or loop? Why?

asked Jan 24, 2020 in JAVA by rahuljain1

0 votes

Q: Which one would be easy to write? synchronization code for 10 threads or 2 threads?

asked Jan 24, 2020 in JAVA by rahuljain1

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