TreeSet ceiling() method in Java with Examples
Last Updated :
04 Apr, 2019
The ceiling() method of java.util.TreeSet<E> class is used to return the least element in this set greater than or equal to the given element, or null if there is no such element.
Syntax:
public E ceiling(E e)
Parameters: This method takes the value e as a parameter which is to be matched.
Return Value: This method returns the least element greater than or equal to e, or null if there is no such element.
Exception: This method throws NullPointerException if the specified element is null and this set uses natural ordering, or its comparator does not permit null elements.
Below are the examples to illustrate the ceiling() method
Example 1:
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
throws Exception
{
try {
TreeSet<Integer> treeadd = new TreeSet<Integer>();
treeadd.add( 10 );
treeadd.add( 20 );
treeadd.add( 30 );
treeadd.add( 40 );
System.out.println( "TreeSet: " + treeadd);
int value = treeadd.ceiling( 25 );
System.out.println( "Ceiling value for 25: "
+ value);
}
catch (NullPointerException e) {
System.out.println( "Exception thrown : " + e);
}
}
}
|
Output:
TreeSet: [10, 20, 30, 40]
Ceiling value for 25: 30
Example 2: To demonstrate NullPointerException.
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
throws Exception
{
try {
TreeSet<Integer> treeadd = new TreeSet<Integer>();
treeadd.add( 10 );
treeadd.add( 20 );
treeadd.add( 30 );
treeadd.add( 40 );
System.out.println( "TreeSet: " + treeadd);
System.out.println( "Trying to compare"
+ " with null value " );
int value = treeadd.ceiling( null );
System.out.println( "Ceiling value for null: " + value);
}
catch (NullPointerException e) {
System.out.println( "Exception: " + e);
}
}
}
|
Output:
TreeSet: [10, 20, 30, 40]
Trying to compare with null value
Exception: java.lang.NullPointerException
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