How can allow duplicate value in set show by doing program....
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How can allow duplicate value in set show by doing program....
A Set does not have duplicate elements.
Can you explain what you are trying to do?
An ArrayList can have duplicate values.
A set's definition is a collection of unique items, so it doesn't make sense to have duplicate values.
There are things known as "multi-sets" or "multi-maps" which do allow duplicate values, but there are no standard implementations in Java.
The simplest way to get something that appears like a multi-map is to create a map with a List for each key. See: The Java Tutorials: The Map Interface