Install and configure JDK in RedHat Linux 9

Generally, it is installed as the root user.
First download a JDK from the sun website. For example: j2sdk1_4_2_05-linux-i586.bin, put in the/usr/local directory,
[Root @ server/] # chmod A + x j2sdk1_4_2_05-linux.bin (add execution permission)
[Root @ server/] #./j2sdk1_4_2_05-linux.bin (execute j2sdk1_4_2_05-linux.bin)

The j2sdk1_4_2_05-linux.rpm is generated in this directory after execution
Install with RPM:
[Root @ server/] # rpm-IV j2sdk1_4_2_05-linux.rpm

After installation, set the environment variables:
Set the followingCodeAdd to/etc/profile:

Java_home =/usr/Java/j2sdk1.4.2 _ 05/
Classpath =/usr/Java/j2sdk1.4.2 _ 05/JRE/lib/RT. jar :.
Path = $ path:/usr/Java/j2sdk1.4.2 _ 05/bin
Export java_home classpath path

Test
[Root @ server/] # source/etc/profile
[Root @ server/] # Java-version