关于Hashtable的问题，up有分

[offsider]

大家看看这段jsp代码是不是有问题？为什么我书读到页面的两个Hashtable的大小一样呢？

<%@page import="java.util.*"%>

<%
Hashtable test1 = new Hashtable();
Hashtable all = new Hashtable();
test1.put("A","第一列");
test1.put("B","第二列");
all.put("FIRST",test1);
test1.clear();
test1.put("1","No1");
test1.put("2","No2");
test1.put("3","No3");
all.put("SECOND",test1);
out.println("all.size = "+all.size()+"<br>");
Hashtable check = (Hashtable)all.get("FIRST");
out.println("first.size = "+check.size()+"<br>");
Hashtable check1 = (Hashtable)all.get("SECOND");
out.println("second.size = "+check1.size()+"<br>");
%>

运行结果如下：
all.size = 2
first.size = 3
second.size = 3
但我觉得应该是
all.size = 2
first.size = 2 //应该是2才对
second.size = 3
请各位高手指点，

[Amani]

<%
Hashtable test1 = new Hashtable();
Hashtable test2 = new Hashtable();
Hashtable all = new Hashtable();
test1.put("A","第一列");
test1.put("B","第二列");
all.put("FIRST",test1);
test2.put("1","No1");
test2.put("2","No2");
test2.put("3","No3");
all.put("SECOND",test2);
out.println("all.size = "+all.size()+"<br>");
Hashtable check = (Hashtable)all.get("FIRST");
out.println("first.size = "+check.size()+"<br>");
Hashtable check1 = (Hashtable)all.get("SECOND");
out.println("second.size = "+check1.size()+"<br>");
%>
运行结果应该是

all.size = 2
first.size = 2
second.size = 3

我想问题出在test1上，有可能都指向test1，才得出
all.size = 2
first.size = 3
second.size = 3

[dagutou]

test1.clear();
会清除所有内容

[goodflash]

up

[Amani]

第二次又test1.put了

[Andrawu]

try:

<%@page import="java.util.*"%>

<%
Hashtable test1 = null ;
Hashtable all = new Hashtable();
test1 = new Hashtable() ;
test1.put("A","第一列");
test1.put("B","第二列");
all.put("FIRST",test1);
test1 = new Hashtable() ;
test1.put("1","No1");
test1.put("2","No2");
test1.put("3","No3");
all.put("SECOND",test1);
out.println("all.size = "+all.size()+"<br>");
Hashtable check = (Hashtable)all.get("FIRST");
out.println("first.size = "+check.size()+"<br>");
Hashtable check1 = (Hashtable)all.get("SECOND");
out.println("second.size = "+check1.size()+"<br>");
%>