Install and configure JDK in Linux

1. Install JDK

Download JDK directly from Sun: The http://java.sun.com/j2se/1.4.2/download.html provides two downloads:

1. rpm in self-extracting file (j2sdk-1_4_2_04-linux-i586.bin, 32.77 MB) This is a self-extracting file, installed on Linux as follows:

# Chmod U + X./j2sdk-1_4_2_04-linux-i586.bin

#./J2sdk-1_4_2_04-linux-i586.bin

After entering YES as prompted, JDK is decompressed to The./j2sdk1.4.2 _ 04 directory. In order to be consistent with the JDK installation path in the following 2, we will perform the following operations to establish the installation path under/usr/Java and test the file to this path:

# Mkdir/usr/Java

# Cp-Fr./j2sdk1.4.2 _ 04/usr/Java

2. rpm in self-extracting file (j2sdk-1_4_2_04-linux-i586-rpm.bin, 32.77 MB) This is also a self-extracting file, but the extracted file is a j2sdk-1_4_2_04-linux-i586-rpm package, run the RPM command to install it on Linux. The installation is as follows:

# Chmod U + X./j2sdk-1_4_2_04-linux-i586-rpm.bin

#./J2sdk-1_4_2_04-linux-i586-rpm.bin

# Rpm-IVH j2sdk-1_4_2_04-linux-i586-rpm

The installation software automatically installs JDK in the/usr/Java/j2sdk1.4.2 _ 04 directory.

2. Configure Environment Variables

1. Modify user environment variables

Assume that the Java User is kunp. Edit the user's. bashrc file to set environment variables.

# Vi/home/kunp/. bashrc

Add the following to the. bashrc file:

Export java_home =/usr/Java/j2sdk1.4.2 _ 04

Export classpath = $ classpath: $ java_home/lib: $ java_home/JRE/lib

Export Path = $ java_home/bin: $ java_home/JRE/bin: $ path: $ homr/bin

2. Modify the environment variables of all users

# Vi/etc/profile

Add:

Export java_home =/usr/Java/j2sdk1.4.2 _ 04

Export classpath = $ classpath: $ java_home/lib: $ java_home/JRE/lib

Export Path = $ java_home/bin: $ java_home/JRE/bin: $ path: $ homr/bin

 

Or

# JDK
Export java_home =/usr/local/jdk1.6.0 _ 14/
Path = $ java_home/bin: $ path
Classpath =.: $ java_home/lib/tools. jar: $ java_home/lib/dt. jar: $ java_home/lib: $ java_home/JRE/lib
Export path user LOGNAME mail hostname histsize inputrc java_home classpath

 

Used to replace the original export

 

 

 

./Etc/profile make the profile take effect. There is a space behind it
Be sure to add $ classpath to the classpath path: Because I didn't add this stuff before, I always reported an error when interpreting and executing the class file.

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