//HashMapDemo.java
//Illustrates the following HashMap methods:
//put()
//containsKey()
//remove()
//keySet()
//get()

import java.util.HashMap;

public class HashMapDemo
{
	public static void main(String[] args)
	{
		HashMap<String, Integer> mountains = new HashMap<String, Integer>();
		mountains.put("Everest",29029);
		mountains.put("K2",28251);
		mountains.put("Kangchenjunga",28169);
		mountains.put("Denali",20335);
		printMap(mountains);

		System.out.println("Denali in the map: " +
			mountains.containsKey("Denali"));
		System.out.println();

		System.out.println("Changing height of Denali.");
		mountains.put("Denali", 20320); // Overwrites the old value for Denali
		printMap(mountains);

		System.out.println("Removing Kangchenjunga.");
		mountains.remove("Kangchenjunga");
		printMap(mountains);

	}

	public static void printMap(HashMap<String, Integer> map)
	{
		System.out.println("Map contains:");
		for (String keyMountainName : map.keySet())
		{
			Integer height = map.get(keyMountainName);
			System.out.println(keyMountainName + " --> " + height.intValue() + " feet.");
		}
		System.out.println();
	}
}