Java : Collection Framework : TreeMap (ceilingEntry)

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TreeMapExample.java

import java.util.Map;
import java.util.TreeMap;

/*
 * Example of ceilingEntry(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, "Eagle");

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

        /*
         * Returns a key-value mapping associated with the least key greater
         * than or equal to the given key, or null if there is no such key.
         */
        Map.Entry<Integer, String> entry = treeMap.ceilingEntry(15);

        System.out.println("ceilingEntry(15) : " + entry);

        entry = treeMap.ceilingEntry(30);

        System.out.println("ceilingEntry(30) : " + entry);

        entry = treeMap.ceilingEntry(200);

        System.out.println("ceilingEntry(200) : " + entry);

    }
}

Output

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

ceilingEntry(15) : 20=Eagle
ceilingEntry(30) : 30=Apple
ceilingEntry(200) : null

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

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