hashmap用法 示例 - 陈华江(huachiang chen)专栏 - csdnblog.mht

HashMap 的是使用

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<P>*/</P>
<P>import java.util.*;<BR>class HaspMapDemo{<BR>&nbsp;public static void =

main(String[] args) <BR>&nbsp;{<BR>&nbsp;&nbsp;//Create a hasp=20
map<BR>&nbsp;&nbsp;HashMap&nbsp;&nbsp; hm=3Dnew&nbsp;&nbsp; HashMap();=20
<BR>&nbsp;&nbsp;//Put elements to the =
map<BR>&nbsp;&nbsp;hm.put("Evan",new=20
Double(12345.77));<BR>&nbsp;&nbsp;hm.put("Rose",new=20
Double(78777));<BR>&nbsp;&nbsp;hm.put("Magic",new=20
Double(-99.10));<BR>&nbsp;&nbsp;hm.put("Mike",new=20
Double(100.00));<BR>&nbsp;&nbsp;hm.put("Sue",new=20
Double(17.15));<BR>&nbsp;&nbsp;//Get a set of the =
entries<BR>&nbsp;&nbsp;Set set=20
=3D hm.entrySet();<BR>&nbsp;&nbsp;//Get an iterator =
<BR>&nbsp;&nbsp;Iterator itr =3D=20
set.iterator();<BR>&nbsp;&nbsp;//Display elements<BR>&nbsp;&nbsp;while=20
(itr.hasNext()){<BR>&nbsp;&nbsp;&nbsp;Map.Entry me =3D=20
(Map.Entry)itr.next();<BR>&nbsp;&nbsp;&nbsp;System.out.println(me.getKey(=
) + ":=20
");<BR>&nbsp;&nbsp;&nbsp;System.out.println(me.getValue());<BR>&nbsp;&nbs=
p;}<BR>&nbsp;&nbsp;System.out.println();<BR>&nbsp;&nbsp;//Deposit=20
1000 into Evan's account<BR>&nbsp;&nbsp;double balance =3D=20
((Double)hm.get("Evan")).doubleValue();<BR>&nbsp;&nbsp;hm.put("Evan",new =

Double(balance + 1000));<BR>&nbsp;&nbsp;System.out.println("Evan's new =
balance :=20
" + hm.get("Evan"));<BR>&nbsp;}<BR>}</P><BR><BR>
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