package corejava; import java.util.*; public class SortedMapDemo { public static void main(String args[]) { // Create a hash map TreeMap tm = new TreeMap(); // Put elements to the map tm.put("Nicole", new Double(3434.34)); tm.put("Ketty", new Double(123.22)); tm.put("Linsay", new Double(1378.00)); tm.put("Jay Sean", new Double(99.22)); tm.put("Sakira", 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 Nicole's account double balance = ((Double) tm.get("Nicole")).doubleValue(); tm.put("Nicole", new Double(balance + 1000)); System.out.println("Nicole's new balance: " + tm.get("Nicole")); } }