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James wu

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since Feb 20, 2001
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Recent posts by James wu

java.lang.String is actually a char array wrapper same as StringBuffer is. So both of your methods will be almost same.
To parse a text file (like huge server log file), if it possible, do not try to load the whole file into memory. That may crash the server. Most of the text file parser will just read one line, then parse one line.
Hope that will help.
J
18 years ago
When I want to run my progam I got this error message:
> Exception in thread "main" java.lang.ClassFormatError:
scuserapp/report/SCReport (Illegal UTF8 string in constant pool)
> at java.lang.ClassLoader.defineClass0(Native Method)
> at java.lang.ClassLoader.defineClass(ClassLoader.java:486)
> at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:111)
> at java.net.URLClassLoader.defineClass(URLClassLoader.java:248)
> at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
> at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:297)
> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:286)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:253)
> at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:313)
> at java.lang.ClassLoader.defineClass0(Native Method)
> at java.lang.ClassLoader.defineClass(ClassLoader.java:486)
> at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:111)
> at java.net.URLClassLoader.defineClass(URLClassLoader.java:248)
> at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
> at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:297)
> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:286)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:253)
> at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:313)
I have no idea about what is "Illegal UTF8 string in constant pool". I think I need somebody's help.
Thanks,
James
19 years ago
If I have a IP address, say, 216.115.109.6, then how can I get the domain name - www.yahoo.ca in Java.
Thank you very much for any help!
19 years ago
Hi,
I need your help! What I want to do is that my Java program is running on Linux and called from telnet. The program will just draw some charts and save them as PNG file by using a pure java PNG encoder, WITHOUT displaying. But when I run it using telnet, I got this:
Exception in thread "main" java.lang.InternalError: Can't connect to X11 window
server using ':0.0' as the value of the DISPLAY variable.
at sun.awt.X11GraphicsEnvironment.initDisplay(Native Method)
at sun.awt.X11GraphicsEnvironment.<clinit>(X11GraphicsEnvironment.java:5
8)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:120)
at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvi
ronment.java:58)
at java.awt.Font.initializeFont(Font.java:264)
at java.awt.Font.<init>(Font.java:298)
at SCTester.<clinit>(SCTester.java:30)
But if I run it from a X window on linux it will be ok. Is there any way that can help me to run my program from telnet. I am not good at linux and x server, so i do need your help! Thanks
J
19 years ago
Here, I generated a image at run time. Does anybody know whether I can save it as a file, like .jpg ,.bmp or whatever format.
Thanks a lot.
19 years ago