This is first part of the coding interview questions. You may refer the complete list here : Java Coding Interview Questions – Part 1 Java Coding Interview Questions – Part 2 Java Coding Interview Questions – Part 3 Java Coding Interview Questions – Part 4 Java Coding Interview Questions – Part 5 Java Coding Interview …
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Question 1 Differences between HashMap and Hashtable ? (OR) What are the differences between a HashMap and a Hashtable in Java? Answer There are several differences between HashMap and Hashtable in Java: – Hashtable is synchronized, whereas HashMap is not. This makes HashMap better for non-threaded applications, as unsynchronized Objects typically perform …
Continue reading HashMap, ConcurrentHashMap, HashTable and Collections.synchronizedMap differencesIn this article we will cover frequently asked ArrayList interview questions. How can we obtain an array from an arraylist class ? How to convert an array to arraylist? ArrayList is resizable . So, can we add elements to an ArrayList obtained from Arrays.asList() ? What is the differences between ArrayList …
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This article provides a collection of frequently asked interview questions and answers regarding Java HashMap. Can we synchronize a HashMap ? Can we add duplicate keys in a HashMap ? What happens to the value if we add a duplicate key with new value ? Is is discarded or is it overwritten …
Continue reading HashMap Interview Questions in Java1 – Difference between HashTable and HashMap HashMap is not threadsafe whereas HashTable is threadsafe Since HashMap is not synchronized it performs better than HashTable Hashtable does not allow null key, hashmap allows 1 null key & several null values Iterator in hashmap is fail-fast. But enum in Hashtable is not fail-fast. Fail-fast means if …
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