├── LICENSE └── README.md /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. By contrast, 15 | the GNU General Public License is intended to guarantee your freedom to 16 | share and change all versions of a program--to make sure it remains free 17 | software for all its users. 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EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY 594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, 595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM 597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 599 | 600 | 16. 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Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Best Java Interview Preparation Resources 2 | Best collection of Java Interview resources including books, courses, interview questions and answers on different topics like core java, collections, mutlithreading, functional programming, serialization, design patterns and more. 3 | 4 | ## Best Java Interview Prep Courses 5 | - [Grokking the System Design Interview](https://designgurus.org/link/84Y9hP?url=https%3A%2F%2Fdesigngurus.org%2Fcourse%3Fcourseid%3Dgrokking-the-system-design-interview) 6 | - [Java Interview Guide: 200+ Interview Questions and Answers](https://click.linksynergy.com/deeplink?id=JVFxdTr9V80&mid=39197&murl=https%3A%2F%2Fwww.udemy.com%2Fcourse%2Fjava-interview-questions-and-answers%2F) 7 | - [Grokking the Coding Interview: Patterns for Coding Questions](https://designgurus.org/link/84Y9hP?url=https%3A%2F%2Fdesigngurus.org%2Fcourse%3Fcourseid%3Dgrokking-the-coding-interview) 8 | - [Grokking the Object-Oriented Design Interview](https://www.educative.io/collection/5668639101419520/5692201761767424?affiliate_id=5073518643380224) 9 | - [Java Multithreading for Senior Engineering Interviews](https://www.educative.io/courses/java-multithreading-for-senior-engineering-interviews?affiliate_id=5073518643380224) 10 | - [200+ SQL Interview Questions](https://click.linksynergy.com/deeplink?id=JVFxdTr9V80&mid=39197&murl=https%3A%2F%2Fwww.udemy.com%2Fcourse%2Fsql-interview-questions%2F) 11 | - [Grokking Dynamic Programming Patterns for Coding Interviews](https://www.educative.io/collection/5668639101419520/5633779737559040?affiliate_id=5073518643380224) 12 | - [Data Structure and Algorithms Analysis - Job Interview](https://click.linksynergy.com/deeplink?id=JVFxdTr9V80&mid=39197&murl=https%3A%2F%2Fwww.udemy.com%2Fcourse%2Fdata-structure-and-algorithms-analysis%2F) 13 | - [Spring and Spring Boot Interview Guide](https://click.linksynergy.com/deeplink?id=JVFxdTr9V80&mid=39197&murl=https%3A%2F%2Fwww.udemy.com%2Fcourse%2Fspring-interview-questions-and-answers%2F) 14 | - [Java Multithreading & Concurrency - Interview Practice Exams](https://click.linksynergy.com/deeplink?id=CuIbQrBnhiw&mid=39197&murl=https%3A%2F%2Fwww.udemy.com%2Fcourse%2Fjava-multithreading-concurrency-interview-practice-exams%2F) 15 | 16 | ## Best Java Interview Prep Books 17 | - [Cracking the Coding Interview: 189 Programming Questions](http://www.amazon.com/dp/098478280X/?tag=javamysqlanta-20) 18 | - [Grokking the Java Interview bundle](https://javinpaul.gumroad.com/l/java-interview-bundle?offer_code=friends20) 19 | - [Grokking the Spring Boot Interview on Gumroad](https://gumroad.com/l/hrUXKY) 20 | - [Java Programming Interview Exposed By Markham](http://www.amazon.com/Java-Programming-Interviews-Exposed-Markham/dp/1118722868?tag=javamysqlanta-20) 21 | - [Programming Interviews Exposed](http://www.amazon.com/dp/1118261364/?tag=javamysqlanta-20) 22 | - [Daily Coding Problem: Get Exceptionally Good](https://www.amazon.com/Daily-Coding-Problem-exceptionally-interviews/dp/1793296634/?tag=javamysqlanta-20) 23 | 24 | 25 | # Java Interview Questions 26 | A comprehensive list of Java interview questions categorized by topic. These questions are asked multiple times on core Java interview to many developers, both junior developers with 1 to 2 years of experienced, intermediate developers of 3 to 5 years of experience and senior developers with 5 to 10 yeras of experience. 27 | 28 | ## Core Java 29 | - [Top 50 Java Programming Interview Questions](https://www.java67.com/2012/08/10-java-coding-interview-questions-and.html) 30 | - [133+ Core Java Interview Questions for 2-5 Years Experienced Programmers](https://javarevisited.blogspot.com/2011/06/top-programming-interview-questions.html) 31 | - [20 Core Java Interview Questions on Overloading and Overriding](https://www.java67.com/2012/09/20-core-java-interview-questions-on.html) 32 | - 33 | 34 | ## OOP Concepts 35 | - [Top 50 Object-Oriented Programming (OOP) Concepts Interview Questions](https://javarevisited.blogspot.com/2013/03/10-oops-object-oriented-design-interview-question-answer.html) 36 | - [Top 20 Object-Oriented Programming (OOP) Concepts Interview Questions Answers](https://www.java67.com/2018/05/20-object-oriented-programming-oops-interview-questions-answers.html) 37 | - [Top 15 Java Method Overloading and Overriding Interview Questions](https://www.java67.com/2013/07/overriding-vs-overloading-java.html) 38 | - [What is Constructor Overloading in Java? Example](https://javarevisited.blogspot.com/2018/08/what-is-constructor-overloading-in-java-example.html) 39 | - [Java Best Practices for Method Overloading? Examples](https://javarevisited.blogspot.com/2017/08/java-best-practices-for-method-overloading-example.html) 40 | - [Can You Overload or Override Static Methods in Java? Example](https://javarevisited.blogspot.com/2012/03/can-we-overload-or-override-static-method-in-java.html) 41 | - [What is Covariant Method Overriding in Java? Example](https://javarevisited.blogspot.com/2013/09/covariant-method-overriding-in-java-example.html) 42 | - [Difference between Abstraction and Encapsulation in Java](https://java67.com/2012/09/abstraction-vs-encapsulation-in-java-oops.html) 43 | - [Difference between Abstract Class and Interface in Java](https://java67.com/2012/09/difference-between-abstract-class-and-interface-in-java.html) 44 | - [Difference between Inheritance and Polymorphism in Java and OOP - Example](https://javarevisited.blogspot.com/2013/05/difference-between-inheritance-and-polymorphism-java-oops.html) 45 | - [Java Polymorphism Interview Questions and Answers](https://javarevisited.blogspot.com/2014/08/polymorphism-in-java-example-tutorial.html) 46 | - [10 Object-Oriented Design Principles](https://javarevisited.blogspot.com/2014/09/10-object-oriented-design-principles.html) 47 | - [Java OOP Interview Questions and Answers](https://www.java67.com/2018/10/java-oops-object-oriented-programming-interview-questions.html) 48 | - [Top 20 Java Interview Questions on Object-Oriented Programming](https://javarevisited.blogspot.com/2014/08/top-20-object-oriented-programming-oops-interview-questions-answers-java.html) 49 | 50 | ## Collections 51 | - [Top 50 Collection Framework Interview Questions](https://www.java67.com/2012/08/10-advanced-java-interview-questions.html) 52 | - [Top 50 Java Collection Framework Interview Questions](https://javarevisited.blogspot.com/2011/10/10-interview-questions-on-collections.html) 53 | - [Difference between ArrayList and HashSet in Java](https://javarevisited.blogspot.com/2014/04/difference-between-arraylist-and-hashset-in-java.html) 54 | - [Difference between HashMap and HashSet in Java](https://javarevisited.blogspot.com/2011/02/difference-between-hashmap-and-hashset.html) 55 | - [Difference between List and Set in Java](https://javarevisited.blogspot.com/2013/12/difference-between-list-and-set-in-java.html) 56 | - [Difference between HashMap and ConcurrentHashMap in Java](https://javarevisited.blogspot.com/2013/01/difference-between-hashmap-vs-concurrenthashmap-java.html) 57 | - [Difference between ArrayList and LinkedList in Java](https://javarevisited.blogspot.com/2012/06/arraylist-vs-linkedlist-in-java.html) 58 | - [Difference between HashMap and TreeMap in Java](https://javarevisited.blogspot.com/2011/12/difference-between-treemap-and-hashmap-java.html) 59 | - [Top 15 ArrayList Interview Questions Answers in Java](https://javarevisited.blogspot.com/2017/03/arraylist-interview-questions-answers-java.html) 60 | - [Difference between Hashtable and HashMap in Java](https://javarevisited.blogspot.com/2010/10/difference-between-hashmap-and.html) 61 | - [Java HashMap Internal Implementation](https://javarevisited.blogspot.com/2011/02/how-hashmap-works-in-java.html) 62 | - [Difference between Iterator and Enumeration in Java](https://javarevisited.blogspot.com/2011/10/what-is-difference-between-iterator-and.html) 63 | - [Difference between ConcurrentHashMap and SynchronizedMap in Java](https://javarevisited.blogspot.com/2012/12/difference-between-concurrenthashmap-vs-synchronizedmap.html) 64 | - [Difference between Comparable and Comparator in Java](https://javarevisited.blogspot.com/2011/06/comparator-and-comparable-in-java.html) 65 | - [What is NavigableMap in Java](https://javarevisited.blogspot.com/2012/12/difference-between-treemap-and-navigablemap-java-example.html) 66 | - [Top 30 Java Collection Framework Interview Questions](https://www.java67.com/2012/09/top-10-collection-framework-interview-questions.html) 67 | - [Top 10 HashMap Interview Questions in Java](https://www.java67.com/2015/09/top-10-hashmap-interview-questions-in.html) 68 | - [Difference between Array and ArrayList in Java](https://www.java67.com/2012/09/difference-between-arraylist-and-array.html) 69 | - [Difference between HashMap and LinkedHashMap in Java](https://www.java67.com/2012/08/difference-between-hashmap-and-linkedhashmap-java.html) 70 | - [Top 10 ConcurrentHashMap Interview Questions in Java](https://www.java67.com/2018/05/top-10-concurrenthashmap-interview-questions.html) 71 | - [Difference between Vector and ArrayList in Java](https://www.java67.com/2012/09/difference-between-vector-vs-arraylist-java.html) 72 | - [Difference between HashMap and WeakHashMap in Java](https://www.java67.com/2013/02/difference-between-hashmap-and-weakhashmap-java.html) 73 | - [Java Collections Framework Tutorial](https://www.java67.com/2012/09/java-collection-framework-tutorial-for.html) 74 | - [Difference between TreeSet and HashSet in Java](https://www.java67.com/2012/08/difference-between-treeset-and-hashset.html) 75 | - [How get() method of HashMap works in Java](https://www.java67.com/2012/09/how-get-method-of-hashmap-works-in-java.html) 76 | - [Java ArrayList contains() method example](https://www.java67.com/2019/04/java-arraylist-contains-method-example.html) 77 | - [Difference between HashMap and IdentityHashMap in Java](https://www.java67.com/2013/02/difference-between-hashmap-and-identityhashmap-java.html) 78 | - [How to iterate over a HashMap in Java](https://www.java67.com/2013/02/how-to-iterate-over-hashmap-in-java.html) 79 | - [Difference between ArrayList and Vector in Java](https://www.java67.com/2012/09/difference-between-vector-and-arraylist-java.html) 80 | - [Top 10 Java Set Interview Questions](https://www.java67.com/2018/05/top-10-java-set-interview-questions.html) 81 | - [Java Collections Framework Cheat Sheet](https://www.java67.com/2018/05/java-collections-framework-cheat-sheet.html) 82 | - [Top 10 TreeMap Interview Questions in Java](https://www.java67.com/2018/05/top-10-treemap-interview-questions-in-java.html) 83 | 84 | ## Multithreading and Concurrency 85 | - [50+ Java Multithreading and Concurrency Questions](https://javarevisited.blogspot.com/2011/10/top-10-java-multithreading-interview-questions.html) 86 | - [Top 30 Java Multithreading Interview Questions Answers](https://www.java67.com/2012/09/top-15-java-multi-threading-interview.html) 87 | - [Top 15 Java Multithreading Interview Questions](https://javarevisited.blogspot.com/2011/05/15-java-multi-threading-interview.html) 88 | - [Top 21 Java Multithreading Interview Questions with Answers](https://javarevisited.blogspot.com/2015/07/top-21-java-multithreading-interview-questions-answers.html) 89 | - [Difference between Sleep and Wait in Java](https://javarevisited.blogspot.com/2011/03/difference-between-sleep-and-wait-in.html) 90 | - [Difference between Notify and NotifyAll in Java](https://javarevisited.blogspot.com/2013/01/difference-between-notify-and-notifyall-java-example.html) 91 | - [Difference between Thread vs Runnable interface in Java](https://javarevisited.blogspot.com/2011/02/difference-thread-vs-runnable-java.html) 92 | - [Difference between synchronized and concurrent collection in Java](https://javarevisited.blogspot.com/2014/03/difference-between-synchronized-and-concurrent-collection.html) 93 | - [What is the difference between process and thread in Java](https://javarevisited.blogspot.com/2011/10/difference-between-process-and-thread.html) 94 | - [How to use Exchanger for inter-thread communication in Java](https://javarevisited.blogspot.com/2015/05/how-to-use-exchanger-for-inter-thread-communication-java-example.html) 95 | - [What is Phaser in Java?](https://javarevisited.blogspot.com/2016/03/what-is-phaser-in-java-and-how-to-use-it-example.html) 96 | - [What is a Daemon thread in Java and Difference with User thread](https://javarevisited.blogspot.com/2012/03/what-is-daemon-thread-in-java-and.html) 97 | - [How to use Fork Join in Java Multithreading](https://javarevisited.blogspot.com/2015/02/how-to-use-fork-join-in-java-multithreading-tutorial-example.html) 98 | - [Top 10 Java ConcurrentHashMap Interview Questions with Answers](https://javarevisited.blogspot.com/2017/08/top-10-concurrenthashmap-interview-questions-answers-java.html) 99 | - [Top 50 Java Multithreading Interview Questions](https://www.java67.com/2018/05/top-50-java-multithreading-interview-questions.html) 100 | - [Java Concurrency and Multithreading Interview Questions](https://www.java67.com/2016/10/20-multiple-choice-questions-java-multithreading-concurrency.html) 101 | - [Difference between Callable and Runnable in Java](https://www.java67.com/2014/03/difference-between-callable-and-runnable-in-java.html) 102 | - [Difference between Synchronized Method and Synchronized Block in Java](https://www.java67.com/2015/10/difference-between-synchronized-method-block-java.html) 103 | - [Difference between CyclicBarrier and CountDownLatch in Java](https://www.java67.com/2015/10/difference-between-cyclicbarrier-and-countdownlatch-java.html) 104 | - [What is ThreadLocal in Java](https://www.java67.com/2015/09/what-is-threadlocal-in-java-with-example.html) 105 | - [Difference between Volatile and Atomic Variables in Java](https://www.java67.com/2016/03/difference-between-volatile-and-atomic-variable-java.html) 106 | - [How to avoid deadlock in Java](https://www.java67.com/2015/09/how-to-avoid-deadlock-in-java-write-deadlock-free-code.html) 107 | - [Difference between submit() and execute() method in Java](https://www.java67.com/2014/05/difference-between-submit-and-execute-method-threadpool.html) 108 | - [How to Create a Thread-Safe Singleton in Java](https://www.java67.com/2014/06/how-to-create-thread-safe-singleton-class-java.html) 109 | 110 | 111 | ## Exception Handling 112 | - [Top 10 Java Exception and Error Interview Questions](https://javarevisited.blogspot.com/2011/09/10-exception-and-error-interview-questions.html) 113 | - [Java Exception Handling Interview Questions](https://www.java67.com/2017/07/10-exception-handling-interview-questions-answers-java.html) 114 | 115 | ## Stream and Functional Programming 116 | - [20 Java 8 Interview Questions](https://javarevisited.blogspot.com/2014/04/java-8-interview-questions-and-answers.html) 117 | - [Top 50 Java 8 Interview Questions](https://www.java67.com/2016/04/top-50-java-8-interview-questions.html) 118 | - [Top 15 Java 8 Stream and Functional Programming Interview Questions Answers](https://www.java67.com/2019/03/top-15-java-8-stream-and-functional-programming-interview-questions.html) 119 | 120 | ## Design Patterns 121 | - [Top 20 Design Pattern Interview Questions](https://javarevisited.blogspot.com/2013/03/10-object-oriented-design-interview-question-answer.html) 122 | - [20 Design Patterns for Java Interview Questions](https://www.java67.com/2012/09/design-patterns-interview-questions.html) 123 | - [Top 10 Design Patterns Interview Questions in Java](https://javarevisited.blogspot.com/2010/12/top-10-design-patterns-interview.html) 124 | - [Difference between Factory and Abstract Factory Pattern in Java](https://javarevisited.blogspot.com/2013/03/difference-between-factory-and-abstract-factory-pattern-in-java.html) 125 | - [Top 10 Object-Oriented Design Principles and Patterns for Java Programmers](https://javarevisited.blogspot.com/2014/01/top-10-object-oriented-design-principles-patterns.html) 126 | - [What is Singleton design pattern in Java](https://javarevisited.blogspot.com/2012/12/how-to-create-thread-safe-singleton-in-java.html) 127 | - [Observer Design Pattern in Java](https://javarevisited.blogspot.com/2011/06/observer-design-pattern-java-example.html) 128 | - [Difference between State and Strategy Design Pattern in Java](https://javarevisited.blogspot.com/2012/06/strategy-vs-state-design-pattern-java.html) 129 | - [How to implement Thread-Safe Singleton Pattern in Java](https://javarevisited.blogspot.com/2012/12/how-to-create-thread-safe-singleton-in-java.html) 130 | - [How to impelment Builder Design Pattern in Java](https://javarevisited.blogspot.com/2012/06/builder-design-pattern-in-java-example.html) 131 | - [When to use Adapter Design Pattern in Java](https://javarevisited.blogspot.com/2013/12/adapter-design-pattern-in-java-example-tutorial.html) 132 | - [How Chain of Responsibility Design Pattern works in Java](https://javarevisited.blogspot.com/2017/09/chain-of-responsibility-design-pattern-in-java.html) 133 | - [What is Decorator Design Pattern in Java](https://javarevisited.blogspot.com/2011/12/decorator-design-pattern-java-example.html) 134 | - [What is Proxy Design Pattern in Java](https://javarevisited.blogspot.com/2011/11/proxy-design-pattern-example-java.html) 135 | - [10 Design Pattern Interview Questions and Answers](https://www.java67.com/2016/10/top-10-design-pattern-interview-questions-answers.html) 136 | - [Difference between Singleton and Static Class in Java](https://www.java67.com/2012/08/difference-between-singleton-pattern-and-static-class-java.html) 137 | - [Java Singleton Design Pattern Example](https://www.java67.com/2012/08/how-to-implement-singleton-design-pattern-in-java.html) 138 | - [Builder Design Pattern Example in Java](https://www.java67.com/2012/09/builder-design-pattern-in-java-example.html) 139 | - [Top 10 Design Patterns in Java](https://www.java67.com/2016/09/top-10-java-design-patterns-interview-questions.html) 140 | - [Observer Design Pattern Example in Java](https://www.java67.com/2012/09/observer-design-pattern-java-example.html) 141 | - [Difference between Strategy and State Design Pattern in Java](https://www.java67.com/2012/09/strategy-vs-state-design-pattern-java.html) 142 | - [Decorator Design Pattern Example in Java](https://www.java67.com/2012/09/decorator-design-pattern-java-example.html) 143 | - [Adapter Design Pattern Example in Java](https://www.java67.com/2012/09/adapter-design-pattern-example-java.html) 144 | - [Difference between Adapter and Proxy Design Pattern in Java](https://www.java67.com/2012/08/difference-between-adapter-and-proxy-design-pattern.html) 145 | - [Facade Design Pattern Example in Java](https://www.java67.com/2012/08/facade-design-pattern-java-example.html) 146 | - [Chain of Responsibility Design Pattern Example in Java](https://www.java67.com/2012/09/chain-of-responsibility-design-pattern-example-java.html) 147 | - [Factory Design Pattern Example in Java](https://www.java67.com/2012/08/factory-design-pattern-java-example.html) 148 | - [Abstract Factory Design Pattern Example in Java](https://www.java67.com/2012/08/abstract-factory-design-pattern-java-example.html) 149 | 150 | ## Serialization 151 | - [Top 10 Java Serialization Interview Questions](https://javarevisited.blogspot.com/2011/04/top-10-java-serialization-interview.html) 152 | 153 | ## JVM Internals 154 | - [Top 10 Java Virtual Machine (JVM) Interview Questions](https://javarevisited.blogspot.com/2011/09/10-java-jvm-internals-interview-questions-answers.html) 155 | 156 | ## String 157 | - [How to find the maximum occurring character in a given String](http://javarevisited.blogspot.com/2012/12/how-to-count-occurrence-of-character-in-String.html) 158 | - [How to remove a given character from a String](https://www.java67.com/2013/03/how-to-replace-string-in-java-character-example.html) 159 | - [How to count the occurrence of a given character in a String](https://www.java67.com/2018/04/21-string-programming-and-coding-interview-questions-answers.html) 160 | - [How to find all permutations of a given String](http://javarevisited.blogspot.com/2015/08/how-to-find-all-permutations-of-string-java-example.html) 161 | - [How to reverse a given String in place](http://javarevisited.blogspot.com/2012/01/how-to-reverse-string-in-java-using.html) 162 | - [How to check if two Strings are anagrams of each other](http://javarevisited.blogspot.com/2013/03/Anagram-how-to-check-if-two-string-are-anagrams-example-tutorial.html) 163 | - [How to convert a given String into an integer](http://javarevisited.blogspot.com/2011/08/convert-string-to-integer-to-string.html) 164 | - [How to check if a given String is a palindrome](http://java67.com/2015/06/how-to-check-is-string-is-palindrome-in.html) 165 | - [How to find the first non-repeated character from a given String](http://javarevisited.blogspot.com/2014/03/3-ways-to-find-first-non-repeated-character-String-programming-problem.html) 166 | 167 | 168 | ## Array 169 | - [How to check if an array contains a number in Java?](https://www.java67.com/2019/02/how-to-check-if-array-contains-number-in-java.html) 170 | - [How to find all pairs in an array whose sum is equal to k](https://javarevisited.blogspot.com/2015/06/how-to-find-all-pairs-in-array-whose-sum-is-equal-k.html) 171 | - [How to remove duplicates from an array in Java](https://javarevisited.blogspot.com/2015/06/how-to-remove-duplicates-from-array-java.html) 172 | - [Binary Search Algorithm without Recursion](https://javarevisited.blogspot.com/2015/08/binary-search-algorithm-in-java-without-recursion.html) 173 | - [Prime Number Generation Algorithms - Sieve of Eratosthenes](https://javarevisited.blogspot.com/2017/08/prime-number-generation-algorithms-sieve-of-eratosthenes.html) 174 | - [How to find largest and smallest number from integer array - Java Solution](https://www.java67.com/2016/06/how-to-find-largest-and-smallest-number-from-array-java.html) 175 | - [How to Reverse an Array in place in Java? Example Solution](https://www.java67.com/2016/01/how-to-reverse-array-in-place-in-java.html) 176 | - [How to sort an Array in descending order in Java? Example Tutorial](https://www.java67.com/2018/03/how-to-sort-array-in-descending-order-in-java-example.html) 177 | - [How to Rotate an Array to Left or Right in Java? Solution Example](https://www.java67.com/2016/05/how-to-rotate-array-to-left-or-right-in-java.html) 178 | - [How to implement Bubble sort in Java?](https://www.java67.com/2012/11/bubble-sort-in-java-program-to-sort.html) 179 | - [How to sort an array in place using the QuickSort algorithm?](https://www.java67.com/2020/01/quicksort-algorithm-in-java-example.html) 180 | - [What is an array? Can you change the size of the array once created?](http://java67.blogspot.sg/2014/08/10-points-about-array-in-java.html) 181 | - [Can you store String in an array of Integer in Java? compile-time error or runtime exception?](http://javarevisited.blogspot.co.uk/2013/11/java-array-101-for-programmers-and.html) 182 | - [What is the difference between ArrayIndexOutfOBounds and ArrayStoreException?](http://javarevisited.blogspot.sg/2014/05/exception-in-thread-main-arrayindexoutofboundsexception-java.html) 183 | - [Can you use Generics with an array?](http://javarevisited.blogspot.sg/2011/09/generics-java-example-tutorial.html) 184 | - [What is a two-dimensional array in Java?](http://java67.blogspot.sg/2014/10/how-to-create-and-initialize-two-dimensional-array-java-example.html) 185 | - [Do you have a three-dimensional array in Java?](http://javarevisited.blogspot.sg/2016/02/6-example-to-declare-two-dimensional-array-in-java.html#axzz4s6N7Y7Gb) 186 | - [How to iterate over an array in Java?](http://java67.blogspot.sg/2013/08/how-to-iterate-over-array-in-java-15.html) 187 | - [What is the difference between an array and a linked list?](http://javarevisited.blogspot.sg/2013/07/difference-between-array-and-linked-list-java.html) 188 | - [How to sort an array in Java?](http://java67.blogspot.sg/2014/08/4-examples-to-sort-array-in-java.html) 189 | - [Top 21 Java Array Interview Questions and Answers](https://www.java67.com/2023/04/top-21-java-array-interview-questions-and-answers.html) 190 | 191 | 192 | ## Linked List 193 | - [What is the difference between an array and a linked list?](http://javarevisited.blogspot.sg/2013/07/difference-between-array-and-linked-list-java.html) 194 | - [How to implement a singly linked list in Java?](http://javarevisited.blogspot.sg/2012/12/how-to-create-linkedlist-in-java-example.html) 195 | - [How to reverse a singly linked list in Java?](http://javarevisited.blogspot.sg/2013/03/how-to-reverse-linked-list-in-java.html) 196 | - [How to detect a loop in a linked list?](http://javarevisited.blogspot.sg/2013/05/how-to-detect-loop-in-linkedlist-java.html) 197 | - [How to find the middle element of a linked list in one pass?](http://javarevisited.blogspot.sg/2012/12/how-to-find-middle-element-of-linked-list-one-pass.html) 198 | - [How to merge two sorted linked lists into one sorted linked list?](http://javarevisited.blogspot.sg/2012/12/how-to-merge-two-sorted-linked-list-into-single-sorted-list.html) 199 | - [How to delete a node from a singly linked list?](http://javarevisited.blogspot.sg/2013/07/how-to-remove-loop-in-linked-list-java.html) 200 | - [How to find the nth node from the end in a singly linked list?](http://javarevisited.blogspot.sg/2012/12/how-to-find-nth-element-from-end-in-linked-list-java.html) 201 | - [How to sort a linked list in Java?](http://javarevisited.blogspot.sg/2013/03/how-to-sort-singly-linked-list-in-java.html) 202 | - [What are the advantages and disadvantages of using a linked list over an array?](http://javarevisited.blogspot.sg/2013/07/difference-between-array-and-linked-list-java.html) 203 | - [How to detect and remove loop in a linked list in Java?](http://javarevisited.blogspot.sg/2013/07/how-to-remove-loop-in-linked-list-java.html) 204 | - [How to find the intersection point of two linked lists?](http://javarevisited.blogspot.sg/2013/03/how-to-find-middle-element-of-linked-list-one-pass.html) 205 | - [How to create a circular linked list in Java?](http://javarevisited.blogspot.sg/2013/07/detecting-loop-in-singly-linked-list-java.html) 206 | 207 | 208 | ## Recursion 209 | - [Write a program to find all permutations of a given String?](https://javarevisited.blogspot.com/2015/08/how-to-find-all-permutations-of-string-java-example.html#axzz5N6yGHupv)) 210 | - [Write a program to check if a given String is a palindrome()?](http://www.java67.com/2015/06/how-to-check-is-string-is-palindrome-in.html) 211 | - [Write a program to remove duplicates from an unsorted linked list?](https://javarevisited.blogspot.com/2012/12/how-to-remove-duplicates-elements-from-ArrayList-Java.html) 212 | - [Write a program to find the length of a given linked list?](https://javarevisited.blogspot.com/2016/05/how-do-you-find-length-of-singly-linked.html#axzz6dXsEfLvJ) 213 | - [Write a program to implement a quicksort algorithm using recursion?](https://www.java67.com/2014/07/quicksort-algorithm-in-java-in-place-example.html) 214 | - [Write a method countLeaves() to find the total number of leaf nodes in a binary tree. If there are no leaf nodes, return 0](https://javarevisited.blogspot.com/2016/12/how-to-count-number-of-leaf-nodes-in-java-recursive-iterative-algorithm.html#axzz6e8hmwujv) 215 | - [Write a program to find the greatest common divisor or GCD of a given number?](http://www.java67.com/2012/08/java-program-to-find-gcd-of-two-numbers.html) 216 | - [Write a program to convert a decimal number to a binary number?](https://javarevisited.blogspot.com/2015/01/how-to-convert-binary-number-to-decimal.html) 217 | - [Write a program to print pre-order traversal of binary tree?](https://javarevisited.blogspot.com/2016/07/binary-tree-preorder-traversal-in-java-using-recursion-iteration-example.html#axzz6dXsEfLvJ) 218 | - [Write a program to print in-order traversal of binary tree using recursion?](https://javarevisited.blogspot.com/2016/07/binary-tree-preorder-traversal-in-java-using-recursion-iteration-example.html#axzz6dXsEfLvJ) 219 | - [Write a program to print post-order traversal of binary tree?](https://javarevisited.blogspot.com/2016/10/post-order-binary-tree-traversal-in-java-iteration-recursion.html) 220 | - [Write a program to check if a given linked list is a palindrome?](https://javarevisited.blogspot.com/2022/03/how-to-check-if-given-linked-list-is.html) 221 | 222 | 223 | ## Coding Problems 224 | - [How to implement Merge Sort Algorithm in Java - Example Tutorial](https://www.java67.com/2020/01/merge-sort-algorithm-in-java-example.html) 225 | - [How to Find Nth Fibonacci Number in Java - Example Tutorial](https://www.java67.com/2020/01/how-to-find-nth-fibonacci-number-in-java.html) 226 | - [How to swap two Integers without using a temporary variable in Java?](https://www.java67.com/2019/02/how-to-swap-two-integers-without-using-temporary-variable-in-java.html) 227 | - [How to find Factorial in Java using Recursion and Iteration - Example Tutorial](https://www.java67.com/2020/01/factorial-in-java-using-recursion-and-iteration.html) 228 | - [How to code Binary Search Algorithm using Recursion in Java? Example](https://www.java67.com/2020/01/binary-search-algorithm-using-recursion-in-java.html) 229 | - [How to convert Decimal to Binary Number in Java? Example Tutorial](https://www.java67.com/2020/01/how-to-convert-decimal-to-binary-in-java.html) 230 | - [Counting Sort in Java - Example](https://www.java67.com/2019/02/counting-sort-in-java-example.html) 231 | - [How to check if an array contains a number in Java?](https://www.java67.com/2019/02/how-to-check-if-array-contains-number-in-java.html) 232 | - [How to sort an array in place using the QuickSort algorithm?](https://www.java67.com/2020/01/quicksort-algorithm-in-java-example.html) 233 | - [How do you print all duplicate elements from the array in Java?](https://www.java67.com/2020/01/how-to-print-duplicate-elements-from-array-in-java.html) 234 | - [Top 100 Data Structure and Algorithm Interview Questions for Java Programmers](https://www.java67.com/2018/04/top-100-data-structure-and-algorithm-interview-questions.html) 235 | - [Top 30 Stack and Queue Data Structure Interview Questions for Practice](https://www.java67.com/2018/04/top-30-stack-and-queue-data-structure-interview-questions.html) 236 | - [Top 40 Binary Tree Coding Interview Questions for Programmers](https://www.java67.com/2018/06/top-40-binary-tree-coding-interview-questions.html) 237 | - [Top 22 Array Concepts Interview Questions Answers in Java](https://www.java67.com/2019/03/top-22-array-concepts-interview-questions-answers-in-java.html) 238 | - [75+ Coding Interview Questions for Programmers](https://javarevisited.blogspot.com/2015/02/75-programming-interview-questions.html) 239 | - [50+ Data Structure and Algorithms Problems from Interviews](https://javarevisited.blogspot.com/2015/02/data-structure-and-algorithm-interview-questions.html) 240 | - [Top 50 Array Coding Problems for Interviews](https://javarevisited.blogspot.com/2015/02/top-50-array-coding-problems-for-interviews.html) 241 | - [Top 20 Linked List Interview Questions for Programmers](https://javarevisited.blogspot.com/2015/02/top-20-linked-list-interview-questions.html) 242 | - [Top 10 Algorithm Interview Questions for Programmers](https://javarevisited.blogspot.com/2015/02/top-10-algorithm-interview-questions.html) 243 | 244 | 245 | ## Miscelleneous 246 | - [Top 50 Core Java Interview Questions Answers](https://javarevisited.blogspot.com/2011/03/core-java-interview-questions-answers.html) 247 | - [Top 30 Core Java Interview Questions for 2 to 3 years Experienced Programmers](https://javarevisited.blogspot.com/2018/01/top-30-core-java-interview-questions-answers-for-2-to-3-years-experienced.html) 248 | - [Top 50 Java Collections Interview Questions](https://javarevisited.blogspot.com/2011/09/top-10-java-collection-interview.html) 249 | - [Top 20 Java Thread Interview Questions Answers](https://javarevisited.blogspot.com/2011/12/top-20-core-java-interview-questions.html) 250 | - [Top 40 Java Programming and Coding Interview Questions](https://javarevisited.blogspot.com/2013/03/40-java-programming-interview-questions.html) 251 | - [Top 10 Java Multithreading Interview Questions Answers](https://javarevisited.blogspot.com/2011/10/top-10-multi-threading-concurrency.html) 252 | - [Top 10 Java Serialization Interview Questions and Answers](https://javarevisited.blogspot.com/2011/10/10-java-serialization-interview.html) 253 | - [Top 10 Java Exception Handling Interview Questions Answers](https://javarevisited.blogspot.com/2011/09/java-exception-interview-questions.html) 254 | - [Top 15 Java NIO Interview Questions Answers](https://javarevisited.blogspot.com/2015/02/15-java-nio-interview-questions-answers.html) 255 | - [Top 10 JDBC Interview Questions Answers for Java Programmers](https://javarevisited.blogspot.com/2012/03/top-10-jdbc-interview-questions-answers.html) 256 | - [Top 10 Java Concurrency Interview Questions and Answers](https://javarevisited.blogspot.com/2015/09/java-concurrency-interview-questions-answers.html) 257 | - [50 Java Coding Interview Questions for Programmers](https://www.java67.com/2012/09/top-50-java-coding-interview-questions.html) 258 | - [20 Core Java Interview Questions from Investment Banks](https://www.java67.com/2013/05/20-core-java-interview-questions-answers.html) 259 | - [10 OOP Design Principles Java Programmer should know](https://www.java67.com/2012/09/10-object-oriented-design-principles.html) 260 | - [20 Java Collections and Generics Interview Questions](https://www.java67.com/2012/09/java-collection-interview-questions.html) 261 | - [15 Serialization Interview Questions in Java](https://www.java67.com/2012/09/15-serialization-interview-questions-in-java.html) 262 | - [10 Exception Handling Interview Questions in Java](https://www.java67.com/2012/10/10-exception-handling-interview.html) 263 | - [10 Concurrency and Multithreading Interview Questions](https://www.java67.com/2013/03/10-multi-threading-interview-questions.html) 264 | - [10 JDBC Interview Questions for Java Programmers](https://www.java67.com/2012/09/jdbc-interview-questions-for-java.html) 265 | - [Top 10 Java Concurrency Interview Questions](https://www.java67.com/2016/05/10-concurrency-multi-threading-interview-questions-answers.html) 266 | - [Top 10 Core Java Interview Questions for Beginners](https://www.java67.com/2018/04/top-10-core-java-interview-questions-answers-for-beginners.html) 267 | - [Top 10 Java String Interview Questions](https://www.java67.com/2015/10/21-string-coding-interview-question-and-answers.html) 268 | 269 | 270 | ## Java Interview Cheat Sheet 271 | ![Java Interview Cheat Sheet](https://github.com/user-attachments/assets/51f017b6-8bc3-4f7b-872d-f8c66be6280b) 272 | 273 | --------------------------------------------------------------------------------