What is the NavigableSet.floor() method in Java?

What is the NavigableSet.floor() method in Java? Answer

In this shot, we will learn how to use the NavigableSet.floor() method in Java. The NavigableSet.floor() method is used to obtain the greatest element that is equal to or less than a given element in a set. It returns null if there is no such element in the set.

The NavigableSet.floor() method is present in the NavigableSet interface inside the java.util package.

Let’s understand with the help of an example. Suppose that a NavigableSet contains [1, 5, 3, 9, 10, 11, 16, 19]. Let 1111 be the element for which we need to determine the floor. So, the result of NavigableSet.floor() is 1010.

Parameter

The NavigableSet.floor() accepts one parameter, i.e., the element for which we need to determine the floor value.

Return value

It returns the greatest element that is equal to or less than the given element in the set.

Code

Let’s have a look at the code.

import java.util.NavigableSet;
import java.util.TreeSet;

class Main 
{
  public static void main(String[] args)
  {
    NavigableSet<Integer> s = new TreeSet<Integer>();

    s.add(6);
    s.add(8);
    s.add(5);
    s.add(3);
    s.add(9);
    s.add(10);
    s.add(17);

    System.out.println("Greatest element less than or equal to 11 is: " + s.floor(11));
  }
}

Explanation

In lines 1 and 2, we import the required packages and classes.
In line 4 we make a Main class.
In line 6, we make a main() function.
In line 8, we create a TreeSet of Integer type. The NavigableSet is inherited from SortedSet, which is actually inherited from TreeSet only. As SortedSet and NavigableSet are interfaces, we cannot instantiate an object of them.
From lines 10 to 16, we added the elements into the NavigableSet by using the add() method.
In line 18, we use the NavigableSet.floor() method and display the result with a message.

In this way, we can use the NavigableSet.floor() method in Java.

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