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import java.util.*;

public class HashMapDemo {

        public static void main(String[] args) {
                HashMap hm = new HashMap();
                hm.put("John Doe", new Double(3434.34));
                hm.put("Tom Smith", new Double(123.22));
                hm.put("Jane Baker", new Double(1378.00));
                hm.put("Ralph Smith", new Double(-19.98));

                Set set = hm.entrySet();
                Iterator i =set.iterator();

                While(i.hasNext()){
//////////////////////����While-->while,�������һ��������н��
Ralph Smith: -19.98
Tom Smith: 123.22
John Doe: 3434.34
Jane Baker: 1378.0
John Doe's new balance: 4434.34
///////////////////////////////////
                        Map.Entry me = (Map.Entry)i.next();
                        System.out.print(me.getKey()+ ": ");
                        System.out.println(me.getValue());
                }
                System.out.println();

                double balance = ((Double)hm.get("John Doe")).doubleValue();
                hm.put("John Doe", new Double(balance + 1000));
                System.out.println("John Doe's new balance: "+
                                    hm.get("John Doe"));
        }
} 

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: import java.util.*;
: public class HashMapDemo {
:         public static void main(String[] args) {
:                 HashMap hm = new HashMap();
:                 hm.put("John Doe", new Double(3434.34));
:                 hm.put("Tom Smith", new Double(123.22));
:                 hm.put("Jane Baker", new Double(1378.00));
:                 hm.put("Ralph Smith", new Double(-19.98));
: .................������ʡ�ԣ�

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