Map.Entry: How to use it?

Question

I\'m working on creating a calculator. I put my buttons in a HashMap collection and when I want to add them to my class, which extends JPanel, I do

Answer 1

Map.Entry interface helps us iterating a Map class

Check this simple example:

public class MapDemo {
    public static void main(String[] args) {
     Map map=new HashMap();
     map.put(1, "Kamran");
        map.put(2, "Ali");
        map.put(3, "From");
        map.put(4, "Dir");
        map.put(5, "Lower");
        for(Map.Entry m:map.entrySet()){
        System.out.println(m.getKey()+"  "+m.getValue());
        }
    }
}