JDK Installation on Linux

DOWNLOADING

Download the latest version of JDK from http://www.java.sun.com. I have downloaded jdk-1_5_0_05-linux-i586-rpm.bin 

PROCESS OF JDK CONFIGURATION

1.     Install jdk by using following command

[root@localhost ~]#chmod a+x jdk-1_5_0_05-linux-i586-rpm.bin

[root@localhost ~]#rpm ./jdk-1_5_0_05-linux-i586.bin

Note: that the initial "./" is required if you do not have "." in your PATH environment variable.

This command creates a directory called jdk1.5.0_05 in your home directory. 

2. Path setting process

Go in /etc directory n open file named profile by this command 

root@localhost ~]#cat /etc/profile
# /etc/profile

# System wide environment and startup programs, for login setup

# Functions and aliases go in /etc/bashrc

pathmunge () {

        if ! echo $PATH | /bin/egrep -q "(^|:)$1($|:)" ; then

           if [ "$2" = "after" ] ; then

              PATH=$PATH:$1

           else

              PATH=$1:$PATH

           fi

        fi

}

# Path manipulation

if [ `id -u` = 0 ]; then

        pathmunge /sbin

        pathmunge /usr/sbin

        pathmunge /usr/local/sbin

fi

pathmunge /usr/X11R6/bin after

# No core files by default

ulimit -S -c 0 > /dev/null 2>&1

USER="`id -un`"

LOGNAME=$USER

MAIL="/var/spool/mail/$USER"

HOSTNAME=`/bin/hostname`

HISTSIZE=1000

if [ -z "$INPUTRC" -a ! -f "$HOME/.inputrc" ]; then

    INPUTRC=/etc/inputrc

fi

export PATH USER LOGNAME MAIL HOSTNAME HISTSIZE INPUTRC

for i in /etc/profile.d/*.sh ; do

    if [ -r "$i" ]; then

        . $i

    fi

done

unset i

3. Change configuration file by following command.

root@localhost ~]#vi /etc/profile
# /etc/profile

# System wide environment and startup programs, for login setup

# Functions and aliases go in /etc/bashrc

pathmunge () {

        if ! echo $PATH | /bin/egrep -q "(^|:)$1($|:)" ; then

           if [ "$2" = "after" ] ; then

              PATH=$PATH:$1

           else

              PATH=$1:$PATH

           fi

        fi

}

# Path manipulation

if [ `id -u` = 0 ]; then

        pathmunge /sbin

        pathmunge /usr/sbin

        pathmunge /usr/local/sbin

fi

pathmunge /usr/X11R6/bin after

# No core files by default

ulimit -S -c 0 > /dev/null 2>&1

USER="`id -un`"

LOGNAME=$USER

MAIL="/var/spool/mail/$USER"

HOSTNAME=`/bin/hostname`

HISTSIZE=1000

if [ -z "$INPUTRC" -a ! -f "$HOME/.inputrc" ]; then

    INPUTRC=/etc/inputrc

fi

JAVA_HOME="/usr/java/jdk1.5.0_05"

export PATH USER LOGNAME MAIL HOSTNAME HISTSIZE INPUTRC

for i in /etc/profile.d/*.sh ; do

    if [ -r "$i" ]; then

        . $i

    fi

done

unset i

unset pathmunge

4. Run JDk by following command.

root@localhost ~]# javac

5. Make a java program by following command

root@localhost ~]#vi HelloWorld.java

public class HelloWorld {

    public static void main(String[] args) {

        System.out.println("Hello, World!");

    }

}

6. Compiling steps

[root@localhost  ~]#javac HelloWorld.java

       [root@localhost  ~]# java HelloWorld

      Hello World