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Java HashMap class implements the map interface by using a hash table. It inherits AbstractMap class and implements Map interface.

The important points about Java HashMap class are:

A HashMap contains values based on the key.
It contains only unique elements.
It may have one null key and multiple null values.
It maintains no order.

activity_main.xml

MainActivity.java

CustomAdapter.java

custom.xml

Output

Screenshot_1514283173

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