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ConcurrentSkipListSet ceiling() method in Java

Last Updated : 17 Sep, 2018
The java.util.concurrent.ConcurrentSkipListSet.ceiling() method is an in-built function in Java which returns the least element in this set greater than or equal to the given element, or null if there is no such element. Syntax: 
 ConcurrentSkipListSet.ceiling(E e)
Parameters: The function accepts a single parameter e i.e. the element to match. Return Value: The function returns the least element greater than or equal to e, or null if there is no such element. Exception: The function shows 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.ceiling() method: Program 1: To find ceiling of a number.
    Output: 
    The set contains: 
13 31 45 72 89 
Ceiling of 35: 45

Ceiling of 100: null
    Program 2: To show NullPointerException in ceiling().
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