how to get all the keys of a java hashmap

/**
 * @author lautturi.com
 * Java example:  how to return all the keys of a java hashmap 
 */

import java.util.*;
import java.util.Map.Entry;

public class Lautturi {
    
	public static void main(String[] args) {
		
		Map<Integer, String> map = new HashMap<>();
		
		map.put(5,"Apple");
		map.put(7,"Banana");
		map.put(12,"Cherry");
		map.put(33,"Orange");

		// return all the keys of hashmap
		Set<Integer> key = map.keySet();

        for(Integer keys: key){
            System.out.println(keys+ " : "  +map.get(keys));
        }

		
	}
}

output:

33 : Orange
5 : Apple
7 : Banana
12 : Cherry