TreeMap K ceilingKey(K key) Method Example Program


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

Program

package com.candidjava;

import java.util.TreeMap;
import java.util.NavigableMap;

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

public class TreeMapCielingKey {
	public static void main(String[] args) {

		NavigableMap<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("Ceiling key entry for 3: " + tm.ceilingKey(3));
		System.out.println("Ceiling key entry for 5: " + tm.ceilingKey(5));
		System.out.println("Ceiling key entry for 7: " + tm.ceilingKey(7));
	}
}

Output

Ceiling key entry for 3: 4
Ceiling key entry for 5: 5
Ceiling key entry for 7: 7

Explanation

public K ceilingKey(K key)
Returns the least key greater than or equal to the given key, or null if there is no such key.
Specified by:
ceilingKey in interface NavigableMap<K,V>
Parameters:
key - the key
Returns:
the least key greater 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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