Install the Java Development Environment in redhat9 Linux and write the "Hello World" program

Install the Java Development Environment in redhat9 Linux and write the "Hello World" program
By: Wu Yin
Date: 2006-06-06
Email: lazy_fox # msn.com
Link: http://blog.csdn.net/wooin/archive/2006/06/12/790763.aspx
Copyright: This article is copyrighted by Wu Yin. It can be freely transmitted and replicated for non-commercial purposes. For business
The purpose of this article is to be approved by the author. Contact info: lazy_fox # msn.com

 
1. Download web page: http://java.sun.com/j2se/1.5.0/download.jsp
2. Download the JRE installation package: jre-1_5_0_07-linux-i586-rpm.bin under Linux
Download JDK installation package under Linux: jdk-1_5_0_07-linux-i586-rpm.bin
All are in Linux RPM (self-extracting file) format.
3. Create the directory/usr/Java and copy the above two files to the folder.
4. change its attributes to executable files.
5. The procedure is as follows:
$ CD/usr/Java
$ Chmod 777 *
$ LS-l
-Rwxrwxrwx 1 wooin 45 m 2006-06-06 jdk-1_5_0_07-linux-i586-rpm.bin
-Rwxrwxrwx 1 wooin 16 m 2006-06-06 jre-1_5_0_07-linux-i586-rpm.bin
6. Run the two executable files separately and the installation will be completed automatically.
$./Jre-1_5_0_07-linux-i586-rpm.bin
$./Jdk-1_5_0_07-linux-i586-rpm.bin
$ Ls
$ Jdk1.5.0 _ 07 jre1.5.0 _ 07
Jdk-1_5_0_07-linux-i586-rpm jre-1_5_0_07-linux-i586-rpm
Jdk-1_5_0_07-linux-i586-rpm.bin jre-1_5_0_07-linux-i586-rpm.bin
7. The installation has been completed. You can delete the installation file and keep only the jdk1.5.0 _ 07 and jre1.5.0 _ 07 folders.
8. Set Firefox:
Create a symbolic connection in the Firefox plugins folder to point to a Java Library File
$ Ln-S/usr/Java/jre1.5.0 _ 07/plugin/i386/ns7/libjavaplugin_oji.so
 
  
9. Set environment variables: In ~ /Add the following lines at the end of the bashrc File
  
Export java_home =/usr/Java/jdk1.5.0 _ 07
  
Export classpath =.:/usr/Java/jdk1.5.0 _ 07/lib/dt. jar:/usr/Java/jdk1.5.0 _ 07/lib/tools. Jar
  
Export Path = $ path:/usr/Java/jdk1.5.0 _ 07/bin
  
10. Compile the helloworld program:
  
Program code:
  
/*************************************** **
  
* Helloworld. Java
  
* Note: The source file name must be the same as the class name, both of which are helloworld.
  
* Compilation command: javac helloworld. Java
  
* Run the command: Java helloworld
  
**************************************** */
  

  
Public class helloworld {
  
Private string hellomsg = "Hello world! ";
  

  
Public static void main (string [] ARGs ){
  
Helloworld hW = new helloworld ();
  
}
  

  
Public helloworld (){
  
// Display our "Hello World" Message
  
System. Out. println (hellomsg );
  
}
  
}
  

  
Compile (make sure you have restarted your computer, or you have run "Export Path = $ path:/usr/Java/jdk1.5.0 _ 07/bin "):
  
$ Javac helloworld. Java
  
A helloworld. Class file is generated.
  
Run the program:
  
$ Java helloworld
  
Hello world!