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Interview Questions and Answers - Order By Newest

Q2561. What is Lock interface in Java Concurrency API ?

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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Q2581. Are arrays Thread Safe ?

Core Java

Ans. Yes

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Q2582. What is the time and space complexity for different operations for arrays ?

Core Java

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Q2583. Difference between Arrays and LinkedList ?

Data Structure

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Q2584. What is the ideal situation / case for using heap sort ?

Algorithm

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Q2585. In an array every element is repeated twice except one, Find that element?

Data Structure

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Q2586. Given a max-heap represented as an array, Return the n th largest element without modifying the heap.

Algorithm

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Q2587. Write code to serialize and deserialize an array of strings ?

Core Java

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Q2588. Find number of recycled pairs in n array.

Data Structure

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Q2589. Given an array, find the minimum inverting factor.

Design

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Q2590. Find the length of the non repeated numbers in an array.

Data Structure

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