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.
import java.util.concurrent.*;
class ConcurrentSkipListSetCeilingExample1 {
public static void main(String[] args)
{
ConcurrentSkipListSet<Integer> Lset =
new ConcurrentSkipListSet<Integer>();
Lset.add( 45 );
Lset.add( 72 );
Lset.add( 31 );
Lset.add( 13 );
Lset.add( 89 );
System.out.println( "The set contains: " );
for (Integer i : Lset)
System.out.print(i + " " );
System.out.println( "\nCeiling of 35: " + Lset.ceiling( 35 ));
System.out.println( "\nCeiling of 100: " + Lset.ceiling( 100 ));
}
}
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Output:
The set contains:
13 31 45 72 89
Ceiling of 35: 45
Ceiling of 100: null
Program 2: To show NullPointerException in ceiling().
import java.util.concurrent.*;
import java.io.*;
class ConcurrentSkipListSetCeilingExample2 {
public static void main(String[] args) throws IOException
{
ConcurrentSkipListSet<Integer> Lset =
new ConcurrentSkipListSet<Integer>();
Lset.add( 45 );
Lset.add( 72 );
Lset.add( 31 );
Lset.add( 13 );
Lset.add( 89 );
try {
System.out.println( "Ceiling of null: " + Lset.ceiling( null ));
}
catch (Exception e) {
System.out.println( "Exception : " + e);
}
}
}
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Output:
Exception : java.lang.NullPointerException
Reference : https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/ConcurrentSkipListSet.html#ceiling(E)
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