HashMap Example

package com.mapsample;

import java.util.HashMap;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;

public class MapDemo {

public static void main(String[] args) {

Hashtable<String, String> hashtableobj = new Hashtable<String, String>();
hashtableobj.put("Alive is ", "awesome");
hashtableobj.put("Love", "yourself");
hashtableobj.put("Clean", "World");
//hashtableobj.put(null,"Testing");

System.out.println("Hashtable object output :" + hashtableobj);

HashMap hashmapobj = new HashMap();
hashmapobj.put("Alive is ", "awesome");
hashmapobj.put("Love", "yourself");
hashmapobj.put("Clean", "World");
//hashmapobj.put(null,"Testing");
System.out.println("HashMap object output :" + hashmapobj);

Set keys = hashmapobj.keySet();
System.out.println(keys);
Iterator itr = keys.iterator();
while(itr.hasNext())
{
String key = itr.next().toString();
System.out.println("Key is "+key+" and value is "+hashmapobj.get(key));
}





// Create a hash map
/* HashMap hm = new HashMap();
// Put elements to the map
hm.put("Zara", new Double(3434.34));
hm.put("Mahnaz", new Double(123.22));
hm.put("Ayan", new Double(1378.00));
hm.put("Daisy", new Double(99.22));
hm.put("Qadir", new Double(-19.08));

// Get a set of the entries
Set set = hm.entrySet();
// Get an iterator
Iterator i = set.iterator();
// Display elements
while (i.hasNext()) {
Map.Entry me = (Map.Entry) i.next();
System.out.print(me.getKey() + ": ");
System.out.println(me.getValue());
}
System.out.println();
// Deposit 1000 into Zara's account
double balance = ((Double) hm.get("Zara")).doubleValue();
hm.put("Zara", new Double(balance + 1000));
System.out.println("Zara's new balance: " + hm.get("Zara"));

TreeMap treeMap = new TreeMap();

treeMap.put("Zara", new Double(3434.34));
treeMap.put("Mahnaz", new Double(123.22));
treeMap.put("Ayan", new Double(1378.00));
treeMap.put("Daisy", new Double(99.22));
treeMap.put("Qadir", new Double(-19.08));
System.out.println(treeMap);


*/ }
}