[670] in java-interest
lifetime of objects
daemon@ATHENA.MIT.EDU (Lein Ton)
Wed Jul 12 17:44:59 1995
Date: Wed, 12 Jul 1995 16:27:03 -0400
From: ton@cc.gatech.edu (Lein Ton)
To: java-interest@java.sun.com
Hi all,
I can remember that creating new objects in C++ within methods was one
of the most certain way of getting a core dump.
The next java program seems to work, but can I be sure that the
instances that created in add() of HtContainer have the same lifetime
as the hashtable in HtContainer?
Have fun,
Lein Ton
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import java.util.*;
class test4 extends Hashtable {
static HtContainer aHtContainer; // container of a hashtable
public static void main(String args[]) {
aHtContainer = new HtContainer();
aHtContainer.output();
}
}
class HtContainer { // container of a hashtable
Hashtable ht;
public HtContainer() {
// create a new hastable, and fill it
ht = new Hashtable();
for (int i = 1; i<100; i++) {
add();
}
}
public void output() {
// show all the hashtable elements
for (Enumeration e = ht.elements(); e.hasMoreElements();)
{
((StringContainer)e.nextElement()).output();
}
}
public void add() {
// add a newly created element to ht
ht.put(Integer.toString(ht.size()),
new StringContainer(Integer.toString(ht.size())));
}
}
class StringContainer { // container for a String
String str;
public StringContainer(String aString) {
str=aString;
}
public void output() {
System.out.println(str);
}
}
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