How doI install JAVA in konqueror?
 

I installed sun java(jre1.4.01),and set konqueror browser,path to java executable,to /usr/java/j2re1..4.2_01,but it is not working.

Set it to:
/usr/java/j2......../bin/java

go to settings (um, under the tools menu? it's slipping my mind right now). Scroll down to plugins. Have konq scan for new plugins. If it doesn't find it, then you'll need to add your path to the search list.

or even better :
a step by step
which is something everyone loves :P

Add this to your .bashrc file:

PATH=$PATH:/usr/java/j2re1..4.2_01/bin
JAVA_HOME=/usr/java/j2re1..4.2_01/bin
export PATH
export JAVA_HOME

Life will be easier after that. Adding the path in the konqueror settings will actually stick then. You'll be able to do the same thing with Opera as well (or any java app, for that matter)