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NavigableMap floorKey() method in Java

Last Updated : 11 Jul, 2025

The floorKey() method of

is used to return the greatest key less than or equal to the given key, or null if there is no such key.

:

K floorKey(K key)

Where, K is the type of key maintained by this map.

: This function accepts a single parameter

which refers to the type of key maintained by this map container.

: It returns the greatest key less than or equal to the given key, or null if there is no such key. Below programs illustrate the floorKey() method in Java:

: When the key is integer.

// Java code to demonstrate the working of
// floorKey() method

import java.io.*;
import java.util.*;

public class GFG {

    public static void main(String[] args)
    {

        // Declaring the NavigableMap of Integer and String
        NavigableMap<Integer, String> nmmp = new TreeMap<>();

        // assigning the values in the NavigableMap
        // using put()
        nmmp.put(2, "two");
        nmmp.put(7, "seven");
        nmmp.put(3, "three");

        System.out.println("The mapping with greatest"
                           + " key is : " + nmmp.floorKey(7));
    }
}

The mapping with greatest key is : 7

: When the key is string.

// Java code to demonstrate the working of
// floorKey() method

import java.io.*;
import java.util.*;

public class GFG {

    public static void main(String[] args)
    {

        // Declaring the NavigableMap of Integer and String
        NavigableMap<String, String> tmmp = new TreeMap<>();

        // assigning the values in the NavigableMap
        // using put()
        tmmp.put("one", "two");
        tmmp.put("six", "seven");
        tmmp.put("two", "three");

        System.out.println("The mapping associated with greatest"
                           + " key is : " + tmmp.floorKey("one"));
    }
}

The mapping associated with greatest key is : one

:

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