Re: garbage collector
Joshua Cranmer wrote:
timothy ma and constance lee wrote:
Sir/madam
I have this question in my heart. In Java, they always say object use
up the memory. Since all java programming will have object
instiantiate like Date(), timestamp, String etc. Should we need to
garbage collect them after use?
If so, how to do that by batch rather than object bu object?
Java garbage collection is handled automatically for you. If you want
objects to be garbage collected, then drop all of the references to the
object, and it will be collected on the next run.
Well, maybe not the very next run, depending on what you mean by "next run".
There are two flavors of GC in the standard Sun default implementation, and it
could be that the object is not collected in a minor GC and will have to wait
for a major GC.
But that doesn't diminish Joshua's point, which is that you don't collect
objects, the JVM does. You just have to make sure nothing refers to them any
more, as Joshua indicated.
The Sun page
<http://java.sun.com/javase/technologies/hotspot/gc/index.jsp>
has a bunch of information that you should study.
It's often a good idea in Javaland to search, in order, Sun, Google and IBM
for information. It didn't take me too long to find the link I posted, given
that I didn't have it bookmarked and needed to hunt it down on Sun's Java
site. It shouldn't have taken you much longer.
Basically, you navigate to
<http://java.sun.com/>
Find the link on the right that says, "Technologies: Java SE"
<http://java.sun.com/javase/>
Click on the "Technologies" tab.
Since GC is a JVM issue, look for the header "Java Virtual Machine". It
sports one link: "HotSpot VM"
<http://java.sun.com/javase/technologies/hotspot/index.jsp>
Look down the page, and hey, presto! There's a link for "HotSpot Garbage
Collection" (/ibid./).
--
Lew