print treeset in java

/**
 * @author lautturi.com 
 * Java example: print treeset in java
 */

import java.util.*;

public class Lautturi {
	
    public static void main(String[] args)
    {
    	TreeSet<Integer> treeset = new TreeSet<Integer>();
    	treeset.add(1);
    	treeset.add(5);
    	treeset.add(7);
    	treeset.add(9);
    	
    	// print the treeSet
    	System.out.println("TreeSet: " + treeset);

    	// iterate through the TreeSet to print its elements. 
    	treeset.forEach( element -> {
    	    System.out.println(element);
    	});
    }
}

output:

TreeSet: [1, 5, 7, 9]
1
5
7
9