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");
		}

	}
}