Posted on 2006-11-05 17:59
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java基礎學習系列
import?
java.util.Hashtable;
import?
java.util.Iterator;
import?
java.util.Set;
public?class?
MainClass?
{
??
public?static?
void?
main
(
String?args
[])?{
????
Hashtable<String,?Double>?balance?=?
new?
Hashtable<String,?Double>
()
;
????
String?str;
????
double?
bal;
????
balance.put
(
"A"
,?
4.34
)
;
????
balance.put
(
"B"
,?
3.22
)
;
????
balance.put
(
"C"
,?
8.00
)
;
????
balance.put
(
"D"
,?
9.22
)
;
????
balance.put
(
"E"
,?-
9.08
)
;
????
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"
))
;
??
}
}