Java Collection : HashMap

YouTube Excerpt: This video explains the working of a HashMap. HashMap works on the principal of hashing. It stores values in the form of key,value pair and to access a value you need to provide the key. For efficient use of HashMap the 'key' element should implement equals() and hashcode() method. equals() method define that two objects are meaningfully equal. hashcode() helps HashMap to arrange elements separately in a bucket. So elements with same hascode are kept in the same bucket together. So when we want to fetch a element using get(K key), HashMap first identifies the bucket in which all elements of the same hascode as the hashcode of the 'key' passed are present. Than it uses the equals() method to identify the actual object present in the bucket. To understand Java collection in more detail follow link http://www.java-redefined.com/2013/08/java-collections-internal-working.html

This video explains the working of a HashMap. HashMap works on the principal of hashing. It stores values in the form of key,value pair and to...

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