Java tutorial
/** *Output: D: 99.22 A: 3434.34 C: 1378.0 B: 123.22 E: -19.08 B's new balance: 1123.22 */ import java.util.Map; import java.util.Set; import java.util.TreeMap; public class MainClass { public static void main(String args[]) { TreeMap<String, Double> tm = new TreeMap<String, Double>(); tm.put("A", new Double(3434.34)); tm.put("B", new Double(123.22)); tm.put("C", new Double(1378.00)); tm.put("D", new Double(99.22)); tm.put("E", new Double(-19.08)); Set<Map.Entry<String, Double>> set = tm.entrySet(); for (Map.Entry<String, Double> me : set) { System.out.print(me.getKey() + ": "); System.out.println(me.getValue()); } System.out.println(); double balance = tm.get("B"); tm.put("B", balance + 1000); System.out.println("B's new balance: " + tm.get("B")); } }