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);

    }
}