Java : Collection Framework : TreeMap (pollFirstEntry)

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TreeMapExample.java

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

/*
 * Example of pollFirstEntry() 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");

        /*
         * Removes and returns a key-value mapping associated with the least key
         * in this map, or null if the map is empty.
         */
        Map.Entry<Integer, String> entry = treeMap.pollFirstEntry();

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

        System.out.println("key : " + entry.getKey() + ","
                + "Value : " + entry.getValue() + "\n");

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

    }
}

Output

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

entry : 10=Cat
key : 10,Value : Cat

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

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

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