TreeMap K floorKey(K key) Method Example Program


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

Program

package com.candidjava;

import java.util.TreeMap;

/**
 * @author: Hari Haran
 * @discription:The floorKey(K key) method is used to return the greatest key
 *                  less than or equal to the given key, or null if there is no
 *                  such key.
 */

public class TreeMapFloorKey {
	public static void main(String[] args) {
		TreeMap<Integer, String> tm = new TreeMap<Integer, String>();

		tm.put(1, "Anand");
		tm.put(2, "Hari Haran");
		tm.put(8, "Kamal");
		tm.put(4, "Karthikeyan");
		tm.put(5, "Mohan");
		tm.put(6, "Vinoth");
		tm.put(7, "Hari Haran");

		System.out.println("Checking greatest key less than or equal to 4");
		System.out.println("Value is: " + tm.floorKey(4));
	}
}

Output

Checking greatest key less than or equal to 4
Value is: 4

Explanation

public K floorKey(K key)
Returns the greatest key less than or equal to the given key, or null if there is no such key.
Specified by:
floorKey in interface NavigableMap<K,V>
Parameters:
key - the key
Returns:
the greatest key less than or equal to key, or null if there is no such key
Throws:
ClassCastException - if the specified key cannot be compared with the keys currently in the map
NullPointerException - if the specified key is null and this map uses natural ordering, or its comparator does not permit null keys


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