Java tutorial
import java.util.Hashtable; import java.util.Iterator; import java.util.Set; class HTDemo2 { public static void main(String args[]) { Hashtable<String, Double> balance = new Hashtable<String, Double>(); String str; double bal; balance.put("A", 3434.34); balance.put("B", 123.22); balance.put("C", 1378.00); balance.put("D", 99.22); balance.put("E", -19.08); Set<String> set = balance.keySet(); Iterator<String> itr = set.iterator(); while (itr.hasNext()) { str = itr.next(); System.out.println(str + ": " + balance.get(str)); } System.out.println(); bal = balance.get("A"); balance.put("A", bal + 1000); System.out.println("A's new balance: " + balance.get("A")); } }