Java : Collection Framework : TreeMap (Firstkey)

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TreeMapExample.java

import java.util.TreeMap;

/*
 * Example of firstKey() 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 first (lowest) key currently in this map.
         */
        Integer firstKey = treeMap.firstKey();

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

    }
}

Output

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

firstKey : 10

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

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