TreeSet floor() method in Java with Examples (original) (raw)

Last Updated : 10 Oct, 2018

The floor() method of java.util.TreeSet class is used to return the greatest element in this set less than or equal to the given element, or null if there is no such element.Syntax:

public E floor(E e)

Parameters: This method takes the value e as a parameter which is to be matched.Return Value: This method returns the greatest element less than or equal to e, or null if there is no such elementException: This method throws the 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 floor() methodExample 1:

Java `

// Java program to demonstrate // floor() method // for Integer value

import java.util.*;

public class GFG1 { public static void main(String[] argv) throws Exception { try {

        // create tree set object
        TreeSet<Integer> treeadd = new TreeSet<Integer>();

        // populate the TreeSet using add() method
        treeadd.add(10);
        treeadd.add(20);
        treeadd.add(30);
        treeadd.add(40);

        // Print the TreeSet
        System.out.println("TreeSet: " + treeadd);

        // getting the floor value for 25
        // using floor() method
        int value = treeadd.floor(25);

        // printing the floor value
        System.out.println("Floor value for 25: "
                           + value);
    }

    catch (NullPointerException e) {
        System.out.println("Exception thrown : " + e);
    }
}

}

`

Output:

TreeSet: [10, 20, 30, 40] Floor value for 25: 20

Example 2: for NullPointerException

Java `

// Java program to demonstrate // floor() method // for NullPointerException

import java.util.*;

public class GFG1 { public static void main(String[] argv) throws Exception { try {

        // create tree set object
        TreeSet<Integer> treeadd = new TreeSet<Integer>();

        // populate the TreeSet using add() method
        treeadd.add(10);
        treeadd.add(20);
        treeadd.add(30);
        treeadd.add(40);

        // Print the TreeSet
        System.out.println("TreeSet: " + treeadd);

        // getting the floor value for null
        // using floor() method
        System.out.println("Trying to get"
                           + " the floor value"
                           + " for null");

        int value = treeadd.floor(null);

        // printing the floor value
        System.out.println("Floor value for 25: "
                           + value);
    }

    catch (NullPointerException e) {
        System.out.println("Exception thrown : " + e);
    }
}

}

`

Output:

TreeSet: [10, 20, 30, 40] Trying to get the floor value for null Exception thrown : java.lang.NullPointerException