iterate through TreeMap in Java

/**
 * @author lautturi.com 
 * Java example: java treemap collection get all keys
 */

import java.util.*;

public class Lautturi {

	public static void main(String[] args) {
		TreeMap<String, String> tm = new TreeMap<String, String>();
		
        //add key-value pair to TreeMap
		tm.put("1", "Apple");
		tm.put("2", "Orange");
		tm.put("3","Banana");
        
        System.out.println(tm);
        Set<String> keys = tm.keySet(); // get keys from tree map in java

        for(String key: keys){
            System.out.print(key+" ");
            System.out.println(tm.get(key));
        }
	
	}
}

output:

{1=Apple, 2=Orange, 3=Banana}
1 Apple
2 Orange
3 Banana