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:
Below programs illustrate the ConcurrentSkipListSet.floor() method:
Program 1:
// 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 ));
}
} |
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().
// 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);
}
}
} |
Exception: java.lang.NullPointerException
Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentSkipListSet.html#floor-E-