Demonstrate TreeMap by Adding Elements

Here is a Java Program to Demonstrate TreeMap

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import java.util.*;   class TreeMapDemo {   public static void main(String args[]) {       // Create a tree map     TreeMap tm = new TreeMap();           // Put elements to the map     tm.put("John Doe", new Double(3434.34));     tm.put("Tom Smith", new Double(123.22));     tm.put("Jane Baker", new Double(1378.00));     tm.put("Tod Hall", new Double(99.22));     tm.put("Ralph Smith", new Double(-19.08));       // Get a set of the entries     Set set = tm.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 John Doe's account     double balance =  ((Double)tm.get("John Doe")).doubleValue();     tm.put("John Doe", new Double(balance + 1000));     System.out.println("John Doe's new balance: " +       tm.get("John Doe"));   } }

Output of Above Java Program
Jane Baker: 1378.0
John Doe: 3434.34
Ralph Smith: -19.08
Tod Hall: 99.22
Tom Smith: 123.22

John Doe's new balance: 4434.34