Java : Collection Framework : TreeMap (ceilingkey)

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TreeMapExample.java

import java.util.TreeMap;

/*
 * Example of ceilingKey(K key) method.
 */
public class TreeMapExample
{
    public static void main( String[] args )
    {

        TreeMap<Integer, String> treeMap = new TreeMap<Integer, String>();

        treeMap.put(10, "Cat");
        treeMap.put(50, "Dog");
        treeMap.put(30, "Apple");
        treeMap.put(40, "Ball");
        treeMap.put(20, "Ball");

        System.out.println("treeMap : " + treeMap + "\n");

        /*
         * Returns the least key greater than or equal to the given key, or null
         * if there is no such key.
         */
        Integer key = treeMap.ceilingKey(24);

        System.out.println("ceilingKey(24) : " + key);
        
        key = treeMap.ceilingKey(20);

        System.out.println("ceilingKey(20) : " + key);
        
        
        key = treeMap.ceilingKey(54);

        System.out.println("ceilingKey(54) : " + key);

    }
}

Output

treeMap : {10=Cat, 20=Ball, 30=Apple, 40=Ball, 50=Dog}

ceilingKey(24) : 30
ceilingKey(20) : 20
ceilingKey(54) : null

To Download TreeMapDemoCeilingKey Project Click the below link
https://sites.google.com/site/javaee4321/java-collections/TreeMapDemoCeilingKey.zip?attredirects=0&d=1

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