ConcurrentSkipListSet floor() method in Java

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:

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    // Java program to demonstrate floor()
    // method of ConcurrentSkipListSet
      
    import java.util.concurrent.*;
      
    class ConcurrentSkipListSetFloorExample1 {
        public static void main(String[] args)
        {
            // Creating a set object
            ConcurrentSkipListSet<Integer>
                Lset = new ConcurrentSkipListSet<Integer>();
      
            // Adding elements to this set
            for (int i = 10; i <= 50; i += 10)
                Lset.add(i);
      
            // Finding floor of 20 in the set
            System.out.println("The floor of 20 in the set "
                               + Lset.floor(20));
      
            // Finding floor of 39 in the set
            System.out.println("The floor of 39 in the set "
                               + Lset.floor(39));
      
            // Finding floor of 9 in the set
            System.out.println("The floor of 10 in the set "
                               + Lset.floor(9));
        }
    }

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    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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    // Java program to demonstrate floor()
    // method of ConcurrentSkipListSet
      
    import java.util.concurrent.*;
      
    class ConcurrentSkipListSetFloorExample2 {
        public static void main(String[] args)
        {
            // Creating a set object
            ConcurrentSkipListSet<Integer>
                Lset = new ConcurrentSkipListSet<Integer>();
      
            // Adding elements to this set
            for (int i = 10; i <= 50; i += 10)
                Lset.add(i);
      
            // Trying to find the floor of null
            try {
                System.out.println("The floor of null in the set "
                                   + Lset.floor(null));
            }
            catch (Exception e) {
                System.out.println("Exception: " + e);
            }
        }
    }

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    Output:

    Exception: java.lang.NullPointerException
    

    Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentSkipListSet.html#floor-E-



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