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The floorEntry() method of NavigableMap interface in Java is used to return a key-value mapping associated with the greatest key less than or equal to the given key, or null if there is no such key. Syntax:

Map.Entry<K, V> floorEntry(K key)

Where, key is the key maintained by this map. Parameters: key - the key Return Value: It returns an entry with the greatest key less than or equal to key, or null if there is no such key. Below programs illustrate the floorEntry() method in Java: Program 1: When the key is integer.

Java

// Java code to demonstrate the working of
// floorEntry() 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.floorEntry(2));
    }
}

Output:

The mapping with greatest key is : 2=two

Program 2: When the key is string.

Java

// Java code to demonstrate the working of
// floorEntry() 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.floorEntry("one"));
    }
}

Output:

The mapping associated with greatest key is : one=two

Reference: https://docs.oracle.com/javase/10/docs/api/java/util/NavigableMap.html#floorEntry(K)

NavigableMap floorEntry() method in Java

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