Java : Collection Framework : TreeMap (Default Constructor)

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TreeMapExample.java

import java.util.TreeMap;

/*
 * Example of TreeMap() Constructor.
 */
public class TreeMapExample
{
    public static void main( String[] args )
    {
        /*
         * Constructs a new, empty tree map, using the natural ordering of its
         * keys. All keys inserted into the map must implement the Comparable
         * interface.
         */
        TreeMap<Integer, String> treeMap = new TreeMap<Integer, String>();

        treeMap.put(1, "Cat");
        treeMap.put(3, "Dog");
        treeMap.put(4, "Apple");
        treeMap.put(2, "Ball");
        

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

    }
}

Output

treeMap : {1=Cat, 2=Ball, 3=Dog, 4=Apple}

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

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