Java : Collection Framework : TreeMap (isEmpty)

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TreeMapExample.java

import java.util.TreeMap;

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

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

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

        /*
         * Returns true if this map contains no key-value mappings.
         */
        boolean isEmpty = treeMap.isEmpty();

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

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

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

        isEmpty = treeMap.isEmpty();

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

    }
}

Output

treeMap : {}
isEmpty : true

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

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

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