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Interview Questions and Answers - Order By Newest

Q2541. Why do we use getbytes in Java?

Ans. It is used to convert String into an array of bytes.

byte[] getBytes() - converts String into a byte array.

byte[] getBytes(Charset charset) - converts String to byte array, based on charset encoding.

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Q2542. If a high CPU Usage happens everyday at a particular time, How would you go about fixing it ?

Server

Ans. We can provision more instances for that particular time slot.

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Q2543. Why AWS is better than Azure ?

Cloud Computing

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Q2544. Can Java be run on hardware with just the JVM and no OS ?

Core Java

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Q2545. Which java feature is used to convert primitive type to reference type ?

Core Java

Ans. AutoBoxing

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Q2546. What is a reflexive equals contract ?

Core Java

Ans. An equal contract is said to be reflexive is equality between 2 objects always returns to be true.

For example -

Object o1;
Object o2;

o1.equals(o2); // returns true
o2.equals(o1); //returns true

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Q2547. Explain Transitive equals contract.

Core Java

Ans. The equals contract is said to be transitive if

obj1.equals(obj2); and obj2(.equals(obj3)

then obj1.equals(obj3) also returns true.

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Q2548. What sets you apart from other developers ?

or

What are the distinguished qualities you have ?

General

Ans. https://blog.timesunion.com/careers/the-10-most-important-personality-traits-for-career-success/633/

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Q2549. Have you ever been in a situation where any of strength became a weakness in some other setting ?

General

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Q2550. What is your greatest fear ?

General

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Q2551. What sort of challenges do you enjoy ?

General

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Q2552. How will you enable or disable assertion for a package during runtime ?

Core Java

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Q2553. Which java version supports assertion ?

Core Java

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Q2554. Create an event class in Java.

Core Java

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Q2555. How does multi threading improve performance ?

Core Java

Ans. Every process in it's timeline require different resources. Utilization of resources can be optimized when they are shared among different processes or threads. When one thread is sleeping waiting for a peripheral to complete (e.g. a disk write, or a key press from the keyboard), other threads can continue using processor time and hence would lead to better usage of resources.

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Q2556. What is Time slicing with respect to Threads ?

Operating System

Ans. Time Slicing is the process to divide the available CPU time to the available runnable threads.

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Q2557. What is Thread scheduler ?

Operating System

Ans. Thread Scheduler is the Operating System service that allocates the CPU time to the available runnable threads.

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Q2558. What are the different ways to avoid multi Threading related problems in Java ?

Core Java

Ans. Synchronization,
Concurrent classes,
Volatile keyword,
Implementing concurrent Lock interface,
Immutable classes

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Q2559. What is context switching wrt Threads in Java?

Core Java

Ans. Context Switching is the process of storing and restoring of CPU state so that Thread execution can be resumed from the same point at a later point of time.

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Q2560. What is an Atomic Operation ?

General

Ans. Atomic operations are performed in a single unit of task without interference from other operations.

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Q2561. What is Lock interface in Java Concurrency API ?

Core Java

Ans. Lock interface provide more extensive locking. They allow more flexible structuring and may support multiple associated Condition objects.

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Q2562. Why Concurrent Collection Classes are fail-fast in Java ?

Core Java

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Q2563. Can a class extend itself in Java ?

Core Java

Ans. No

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Q2564. What is method hiding in Java ?

Core Java

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Q2565. Can you prevent overriding a method without using final modifier or without declaring it private ?

Core Java

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Q2566. Can we override a non-static method as static in Java ?

Core Java

Ans. No, there is no method overriding with static methods.

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Q2567. Can we declare constructor inside an interface ? Why ?

Core Java

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Q2568. Can we declare an Interface with abstract keyword ?

Core Java

Ans. Yes

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Q2569. Does Java generate .class file for interfaces ?

Core Java

Ans. Yes

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Q2570. How arrays work internally ?

Core Java

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