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Q2551. What sort of challenges do you enjoy ?

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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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Q2571. Can we change the size of array once created ?

Core Java

Ans. No. Arrays cannot resize dynamically.

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Q2572. Can we use generics with arrays in Java ?

Core Java

Ans. No

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Q2573. What is the difference between ArrayIndexOutOfBoundException and ArrayStoreException?

Core Java

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Q2574. What is ArrayStoreException ?

Core Java

Ans. It's an exception that is thrown when we attempt to add value of an incompatible type to an array.

For example -

Object[] strArray = new String[2];
strArray[0] = 5;

In this code, strArray reference of type Object has currently been assigned the String array but at line 2 we are trying to add an integer value.

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Q2575. What is an anonymous array in Java ?

Core Java

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Q2576. Can you write code to copy one array into another ?

Data Structure

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Q2577. What are jagged arrays ?

Core Java

Ans. an array of different sizes

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Q2578. Where are arrays stored in memory - stack or heap ?

Core Java

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Q2579. Are Arrays treated like primitives or like objects in Java ?

Core Java

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Q2580. How can we check equality for Arrays in Java ?

Core Java

Ans. You call the method java.util.Arrays.equals(Object[] a, Object[] a2)?

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