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ConcurrentSkipListSet first() method in Java

Last Updated : 17 Sep, 2018
The first() method of java.util.concurrent.ConcurrentSkipListSet is an in-built function in Java which returns the first (lowest) element currently in this set. Syntax: 
ConcurrentSkipListSet.first()
Return Value: The function returns the first (lowest) element currently in this set. Exception: The function throws NoSuchElementException if this set is empty. Below programs illustrate the ConcurrentSkipListSet.first() method: Program 1:
Output: 
The lowest element in the set: 10
Program 2: Program to show NoSuchElementException in first().
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