Interview Questions and Answers - Expert Level | Search Interview Question

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Q71. What are the ways to break singleton pattern ?

Ans. If we don't have double checked locking, it can be broken easily through multi threaded access.

Through Reflection.

If multiple class loaders are loading the class.

If the class is serializable or cloneable.

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Q72. What is the Big O notation for Fibonacci series - both iterative as well as recursive ?

Algorithm

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Q73. Write a method that takes a string as input and identifies if any permutation of the String is Palindrome ? For example - ttoobb has a permutation 'bottob' which is a palindrome.

Design

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Q74. Design database schema for Facebook like application.

Database

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Q75. How would you design a Thread Pool ?

Design

Ans. By using Executor Framework , we can create Thread pool

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Q76. Are final methods faster than regular instance methods ?

Core Java

Ans. Yes. As they cannot be overridden , there is no use of virtual table concept which is used for dynamic binding resolution.

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Q77. How is the virtual method table implemented in Java?

Core Java

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Q78. Why Concurrent Collection Classes are fail-fast in Java ?

Core Java

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Q79. What is something faulty about java ?

Core Java

Ans. Not purely object oriented Language.

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Q80. How does Garbage Collector work? What are the realizations of Garbage Collector.

Core Java

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Q81. What is the O notation for the ArrayList and List? And which one would you choose to insert item in the middle?

Data Structure

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Q82. Do threads have a distinct heap ?

Memory Management

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Q83. Can we do a thread specific heap allocation ?

Memory Management

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