Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.util.HashMap;
import java.util.Map;

public class Main {

    public static void main(String[] argv) {
        Map<String, String> map = new HashMap<String, String>();
        map.put("1", "one");
        map.put("2", "two");
        map.put("3", "three");
        map.put("4", "four");

        System.out.println(getKeyFromValue(map, "three"));
    }

    public static Object getKeyFromValue(Map hm, Object value) {
        for (Object o : hm.keySet()) {
            if (hm.get(o).equals(value)) {
                return o;
            }
        }
        return null;
    }
}