package collection;

import java.util.HashMap;

import java.util.Iterator;

import java.util.Map;

import java.util.Map.Entry;

import java.util.Set;

public class HashMapExample {

public static void main(String[] args) {

/* This is how to declare HashMap */

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

/* Adding elements to HashMap */

hmap.put(12, "Core Java");

hmap.put(2, "Adv Java");

hmap.put(7, "Spring");

hmap.put(49, "Hibernate");

hmap.put(3, "Maven");

/* Get values based on key */

String var = hmap.get(2); // Key:2

System.out.println("Value for key:2 is: " + var + "\n");

/* Remove values based on Key:3 */

hmap.remove(3);

/* Display content using Iterator */

Set<Entry<Integer, String>> set = hmap.entrySet();

Iterator<Entry<Integer, String>> iterator = set.iterator();

while (iterator.hasNext()) {

Entry<Integer, String> me = iterator.next();

System.out.print("Key is: " + me.getKey() + " & Value is: " + me.getValue() + "\n");

}

}

}