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Interview Questions On Map In Java

Written by Juan Stafford Jun 25, 2022 · 3 min read
Interview Questions On Map In Java

Table of Contents

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Introduction

Java is a widely-used programming language, and maps are an important data structure in Java. As a Java developer, you may encounter interview questions on maps in Java. In this article, we will cover some commonly-asked interview questions on maps in Java.

What is a Map in Java?

A Map is a key-value pair-based data structure in Java. It stores data in the form of keys and their corresponding values. In a Map, keys are unique, and each key maps to a single value.

What are the different types of Maps in Java?

Java provides several types of Maps, including HashMap, TreeMap, LinkedHashMap, and ConcurrentHashMap. Each of these Maps has its unique features and is suitable for different use cases.

What is the difference between HashMap and TreeMap?

HashMap is a hash table-based implementation of the Map interface, while TreeMap is a Red-Black tree-based implementation of the NavigableMap interface. The main difference between the two is that HashMap is unordered, while TreeMap is ordered.

What is the difference between HashMap and HashTable?

HashMap and HashTable are both hash table-based implementations of the Map interface. The main difference between the two is that HashMap is not synchronized, while HashTable is synchronized.

What is the difference between HashMap and ConcurrentHashMap?

HashMap and ConcurrentHashMap are both hash table-based implementations of the Map interface. The main difference between the two is that ConcurrentHashMap is designed for concurrent use and is thread-safe, while HashMap is not.

What is the difference between HashMap and LinkedHashMap?

HashMap and LinkedHashMap are both hash table-based implementations of the Map interface. The main difference between the two is that LinkedHashMap maintains the order in which elements are inserted into the Map, while HashMap does not.

What is the difference between a Set and a Map?

A Set is a collection of unique elements, while a Map is a collection of key-value pairs. In a Set, only one instance of each element can exist, while in a Map, each key maps to a single value.

What is the difference between a HashMap and a HashSet?

HashMap is a hash table-based implementation of the Map interface, while HashSet is a hash table-based implementation of the Set interface. The main difference between the two is that HashMap stores key-value pairs, while HashSet stores only values.

What is the difference between a HashMap and a List?

A HashMap is a key-value pair-based data structure, while a List is an ordered collection of elements. In a HashMap, elements are accessed by their keys, while in a List, elements are accessed by their index.

Conclusion

In this article, we covered some commonly-asked interview questions on maps in Java. By understanding the different types of maps and their features, you can better prepare for your Java developer job interviews. Remember to practice your coding skills and stay up-to-date with the latest developments in Java.
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