Install java in 5.0

Java installation steps in 5.0-general Linux technology-Linux programming and kernel information. For details, refer to the following section. Step 1: jdk in linux. This is easy to handle. You can go to sun's website.

Step 2: Decompress the package. That's not enough. Right-click it. If you think you should make yourself look like a master, use the gunzip command. An rpm is generated.

Step 3: Double-click rpm. Oh, it looks like a master. You can use rpm-ivh.

Step 4: There are three methods on the Internet.

The most difficult
# Export JAVA_HOME =/usr/java/j2sdk1.4.2 _ 06
# Export CLASSPATH =.: $ JAVA_HOME/lib/dt. jar: $ JAVA_HOME/lib/tools. jar
# Export PATH = $ PATH: $ JAVA_HOME/bin

Why is it most difficult to use? Every time you use it, you need to add it. do you say it is easy to use?

Recommended method (recommended by others, not by me, but by the next method)

Use cd to switch to your main directory, such as root/root and kookl/home/kookl.

Run vi. bashrc
Set JAVA_HOME =/usr/java/j2sdk1.4.2 _ 06
Export JAVA_HOME
Set PATH = $ PATH: $ JAVA_HOME/bin
Export PATH
Set CLASSPATH =.: $ JAVA_HOME/lib/dt. jar: $ JAVA_HOME/lib/tools. jar
Export CLASSPATH

(The problem is: Under Hongqi 5, this is useless. For me, maybe there is a problem with my red flag (even after the shutdown, it will be normal to have a problem)

My method
# Vi/etc/profile

Add
JAVA_HOME =/usr/java/jdk1.5.0 _ 05
PATH = $ JAVA_HOME/bin: $ PATH
CLASSPATH =.: $ JAVA_HOME/lib/dt. jar: $ JAVA_HOME/lib/tools. jar
Export JAVA_HOME, PATH, CLASSPATH

Step 5: restart (for me, shut down ).

Now you can use it. Check it out. Use java-version to check the version. Use vi to compile and run the hello world Program.