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ConcurrentSkipListSet floor() method in Java

Last Updated : 21 Sep, 2018
The floor() method of java.util.concurrent.ConcurrentSkipListSet is an in-built function in Java which returns the greatest element in this set less than or equal to the given element, or null if there is no such element. Syntax: 
ConcurrentSkipListSet.floor(E e)
Parameter: The function accepts a single parameter e i.e. the value to match. Return Value: The function returns the greatest element less than or equal to e, or null if there is no such element. Exception: The function throws the following exceptions:
  • ClassCastException - if the specified element cannot be compared with the elements currently in the set.
  • NullPointerException - if the specified element is null
    • Below programs illustrate the ConcurrentSkipListSet.floor() method: Program 1:
    Output: 
    The floor of 20 in the set 20
The floor of 39 in the set 30
The floor of 10 in the set null
    Program 2: Program to show NullPointerException in floor().
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