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Java Newsletters Archive: 178 Monday, February 02, 2004 (16:09:34)
Posted by jalex
===
[ The Java FAQ Daily Tips, weekly publication ]
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| Issue
No: 178
7 August 2003 |
| 14019 subscribers
|
Foreword: Excuse me for
possible mistakes. English is not native language for me.
In this issue:
Hello dear friends!
Question: My application runs much slower with 1.3/1.4
when compared with the 1.2 Production release for Solaris. Why?
Answer: Assuming that you are running a lot of bytecode
make sure that you are using the correct mode of the virtual machine. For
applications where small footprint and fast startup are important, use -client.
For applications where overall performance is the most important, use -server.
Don't forget that -server or -client must be the first argument to java, -client
is the default. If this isn't your problem, read on for more tuning parameters
you can try...
from the Java Hotspot Virtual
Machine FAQ: http://java.sun.com/docs/hotspot/PerformanceFAQ.html
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Question: What's the difference between the -client and
-server systems (options in JVM)?
Answer: These two systems are different binaries.
They are essentially two different compilers (JITs) interfacing to the same
runtime system. The client system is optimal for applications which need fast
startup times or small footprints, the server system is optimal for applications
where the performance is most important. In general the client system is better
on GUIs. Some of the other differences include the compilation policy used, heap
defaults, and inlining policy.
from the Java Hotspot Virtual
Machine FAQ: http://java.sun.com/docs/hotspot/PerformanceFAQ.html
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Latest posts on our
message
board |
| JList in a JTable cell
Is it possible to render JList
into a JTable cell? If it is please provide a code sample. Thanks,
EML please help here
... | | |
| Object serialization
Hi all,
have a question
for you. I have a socket sock, I use ObjectStream to read/write objects on
the socket. If I write 2 or more times an object on the stream (the exactly same
object) on the other side I don't see its state (values of attributes) changes.
For example if I write a Dimension object 2 times and after the first
writeObject I change its state with setSize, the second time I do readObject it
return the SAME STATE as the first time, as I if never changed the size of
Dimension.
continues here
... | | |
| How to realize my project
Hi, I’m new on java and i
should do a project to create an application to design Workflow on thin client
(IE6) or a software and use Java Web Start. The design is base on the
state-chart diagram. All the information concerning items (position, size) will
be store under lotus Notes Documents. Each item (state, chart relations)
will have different values selected from list. Each list will be fill in with
informations descended from data contains under Lotus Notes documents. State
and chart max number: 99 We will use Lotus Domino R6 as HTTP server. In
fact the applet I should create will only be use to draw, all the information
are from and store under Lotus Notes
The software should contain a zoom
option, an export option(GIF,.. ) and a print option (PDF, printer)
I
found jgraph,
continues here
... | | |
| problem with JPopup
Hello,
i have following
problem. In a JTree i show a JPopup if i clicked with right mousebutton.
If something is select and action the Popup i will allow to move it. This
means i draw a ghost image of the selection on the position of the popup. I
draw this image if the method actionperformed of the Popup calls. And when
the mouse moves i draw it at the mouseposition. Now the problem. After the
popup action the image is not draw correctly. At the position of popup it draw
wight and the rest show correct. I have try to draw in following methods:
-popupMenuWillBecomeInvisible and
-propertyChange(PropertyChangeEvent e) {
if(e.getPropertyName().compareTo("visible")==0)
if((Boolean)e.getNewValue() == Boolean.FALSE) } continues here
... | | |
| Rounding Oval in a rect.
Hey everybody. Please help me
create a java applet of which the ball is rounding in a rectengular/square...
And otherone. There is bar getting longer as you press a key.
Please please please I need
you... | | |
| Limiting JTextArea
Basically all I want to do is
limit a JTextArea to, say, four lines max. I mean 4 physical lines, not 4
sentences. Now I know about PlainDocument and I know how to determine how many
carriage returns there are in the JTextArea. But sometimes there will be
carriage returns and sometimes there will just be linewraps at a word space.
Both create "new lines" in my situation.
So I'm struggling determining
how many lines are in the JTextArea when carriage returns aren't used and how to
limit the max number of lines. I have got as far as stopping entry when the
fourth line is at its maximum width but this also stops entry on previous lines
if the user moves the cursor back up a line.
At this point I'm going
around in circles and need a fresh approach. Any code examples or thoughts would
be sincerely appreciated. please help here ... | | |
|