Install JDK and set Java environment variables in Linux

Install JDK in Linux as follows:

Step 1: Check whether the built-in JDK of Linux is installed

(1) view the installed JDK:

# Rpm-Qa | grep JDK plugin to view JDK information or directly execute

Or

# Rpm-Q JDK

 

Or

# Java-version

 

(2) rpm-Qa | grep JDK uninstall:

 

(3) If the rpm-e RPM package name (as shown above) has a dependency, uninstall the upper-layer package first.

 

Step 2: Install JDK

<1> download jdk-1_5_0_14-linux-i586-rpm.bin or jdk-1_5_0_14-linux-i586.bin from sun

Create a Java folder under/USR and put the installation package in the/usr/Java directory.

# Mkdir/usr/Java

<2> install JDK

# Cd/usr/Java (mkdir Java-this directory needs to be created)

① Install jdk-1_5_0_16-linux-i586-rpm.bin files

# Chmod 777 jdk-1_5_0_16-linux-i586-rpm.bin supervisor modified to Executable

#./Jdk-1_5_0_16-linux-i586-rpm.bin accept select YES to agree to the above agreement

# Rpm-IVH jdk-1_5_0_16-linux-i586.rpm configure Select Yes until installation is complete

② Install jdk-1_5_0_16-linux-i586.bin files

# Chmod A + x jdk-1_5_0_16-linux-i586.bin grants the current user permission to execute

#./Jdk-1_5_0_16-linux-i586.bin plugin Select Yes until installation is complete

 

Step 3: Configure Environment Variables

<1> # vi/etc/profile

<2> Add the following lines at the end:

Export java_home =/usr/Java/jdk1.5.0 _ 16

Export classpath =.: $ java_home/JRE/lib/RT. jar: $ java_home/lib/dt. jar: $ java_home/lib/tools. Jar

Export Path = $ path: $ java_home/bin

<3> # source/etc/profile takes effect after execution

 

Step 4: Test JDK

# Vi hello. Java

Public class Hello {

Public static void main (string ARGs [])

{

System. Out. println ("Hello world! ");

System. Out. println ("2009/2/19 ");

}

}

# Javac hello. Java

# Java hello

 

Hello world!

2009/2/19

 

The installation is successful!

 

This article from the csdn blog, reproduced please indicate the source: http://blog.csdn.net/candle806/archive/2009/05/14/4187017.aspx