The
pollFirst() method of
java.util.concurrent.ConcurrentSkipListSet is an in-built function in Java which returns retrieves and removes the first (lowest) element, or returns null if this set is empty.
Syntax:
public E pollFirst()
Return Value: The function returns retrieves and removes the first (lowest) element, or returns null if this set is empty.
Below programs illustrate the ConcurrentSkipListSet.pollFirst() method:
Program 1:
Output:
Contents of the set: [10, 20, 30, 40, 50]
The first element of the set: 10
Contents of the set after pollFirst: [20, 30, 40, 50]
Program 2:
