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TreeMap floorEntry() Method in Java With Examples

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  • Last Updated : 02 Sep, 2020

The java.util.TreeMap.floorEntry() method 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:

tree_map.floorEntry(K key)

Parameters: This method takes one parameter key to be matched while mapping.

Return Value:  This method returns an entry with the greatest key less than or equal to key, or null if there is no such key.

Exceptions:  

  •  ClassCastException : This exception is thrown if the specified key cannot be compared with the keys currently in the map.
  •  NullPointerException : This exception is thrown if the specified key is null and this map uses natural ordering, or its comparator does not permit null keys.

Example 1: When there is a key

Java




// Java program to illustrate
// TreeMap floorEntry() method
import java.util.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // Creating an empty TreeMap
        TreeMap<Integer, String> treemap
            = new TreeMap<Integer, String>();
        
        // Mapping string values to int keys 
        treemap.put(20, "Twenty");
        treemap.put(10, "Ten");
        treemap.put(13, "Thirteen");
        treemap.put(60, "Sixty");
        treemap.put(50, "Fifty");
  
        System.out.println("The greatest key-value less than 18 is : "
                           + treemap.floorEntry(18));
    }
}
Output
The greatest key-value less than 18 is : 13=Thirteen

Example 2: When there is no such key

Java




// Java program to illustrate
// TreeMap floorEntry() method
import java.util.TreeMap;
  
public class GFG {
    public static void main(String args[])
    {
  
         // Creating an empty TreeMap
        TreeMap<Integer, String> treemap
            = new TreeMap<Integer, String>();
  
        // Mapping string values to int keys 
        treemap.put(10, "Akash");
        treemap.put(20, "Pratik");
        treemap.put(30, "Vaibhav");
        treemap.put(40, "Sagar");
        treemap.put(50, "Abhishek");
  
        // Printing floor entry
        System.out.println("The greatest key-value less than 5 is : "
                           + treemap.floorEntry(5));
    }
}
Output
The greatest key-value less than 5 is : null

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