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import java.util.*; public class TreeMapDemo { public static void main(String args[]) { // Create a hash map TreeMap tm = new TreeMap(); // Put elements to the map tm.put("Zara", new Double(3434.34)); tm.put("Mahnaz", new Double(123.22)); tm.put("Ayan", new Double(1378.00)); tm.put("Daisy", new Double(99.22)); tm.put("Qadir", new Double(-19.08)); Set set = tm.entrySet(); Iterator i = set.iterator(); while(i.hasNext()) { Map.Entry me = (Map.Entry)i.next(); System.out.print(me.getKey() + ": "); System.out.println(me.getValue()); } System.out.println(); double balance = ((Double)tm.get("Zara")).doubleValue(); tm.put("Zara", new Double(balance + 1000)); System.out.println("Zara's new balance: " + tm.get("Zara")); } }
运行结果 :
正在执行...
