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Uses a generic Hashtable to store the names of bank depositors and their current balances

import java.util.Enumeration; import java.util.Hashtable; class HTDemo {   public static void main(String args[]) {     Hashtable<String, Double> balance = new Hashtable<String, Double>();     Enumeration<String> names;     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);     names = balance.keys();     while (names.hasMoreElements()) {       str = names.nextElement();       System.out.println(str + ": " + balance.get(str));     }     bal = balance.get("A");     balance.put("A", bal + 1000);     System.out.println("A's new balance: " + balance.get("A"));   } }