Question

How to print HashMap keys in Java

Answer 1

import java.util.HashMap;

public class MyClass {
    public static void main(String[] args) {

        HashMap<Integer, String> hmap = new HashMap<Integer, String>();

        hmap.put(1, "Darth Vader");
        hmap.put(5, "Luke Skywalker");
        hmap.put(7, "Obi-Wan Kenobi");
        hmap.put(2, "Han Solo");

        for (Integer i : hmap.keySet()) {
               System.out.println(i);
        }
    }
}



/*
run:

1
2
5
7

*/

 

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