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 Java in Linux

[Fracker]

Fracker  

 Java in Linux

[HelloWorldApp.java]

Writing and compiling Java program on linux

You need,

1. Java SE Development Kit 4 for linux version
2. A Text editor such as Pico, vi or emacs (all 3 are built in linux)

Now write a program using Pico, vi or emacs, let say you have given name as HelloWorldApp.java

class HelloWorldApp {
    public static void main(String[] args) {
        System.out.println("Hello World!");
    }
}

 (after installation java. environment variable will automatically register) you can verify these environmental variables by env or echo

JAVA_HOME=/usr/java/j2se
JAVA_FONTS=/usr/share/fonts/truetype
ANT_HOME=/usr/share/ant

Now compile using javac program,

javac HelloWorldApp.java

After running above program a file will be generated HelloWorldApp.class

Always remember both javac, and java are case sensitive, so HelloworldApp.java is not equal to helloworldapp.java.

Now simply run the program using java

java HelloWorldApp

The end...

[polas]

polas  

 Re: Java in Linux

Not hugely dissimilar than from on Windows

[singam]

singam  

 Re: Java in Linux

Yesterday my dad bought me a Cnm Book and it is on Linux. I tried to install flash player so i could watch youtube and play online games but i installed flash player tar but it is just in my documents now and youtube still won't play. Can someone help me and give me step by step instruction please, i would be extremely great full. Thank you I don't know if this helps but i am on Bon Echo interent provider.
=============

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[polas]

polas  

 Re: Java in Linux

Google it, flash is often a little tricky and requires specific files to be placed in FF's directories

[katiedeneuve]

katiedeneuve  

 Re: Java in Linux

I need help! Can anyone here help me and tell me how can install flash player in my browser so that I can watch YouTube videos.

[john14317]

john14317  

 Re: Java in Linux

You can also compile and execute your Java program directly from the shell. Set your working directory to the location of your .java file.

    To compile, type:

        [username:~/introcs/hello] javac HelloWorld.java

    To execute, type:

        [username:~/introcs/hello] java HelloWorld

[cashcars]

cashcars  

 Re: Java in Linux

he uninstall process consists of:

    Java Plug-in Uninstall
    Java Uninstall
        RPM Uninstall
        Self extracting Uninstall

Java Plug-in Uninstall: Mozilla browser
If you are going to reinstall Java, you don't need to uninstall Java Plug-in. Just use the -f option for ln when creating a new symbolic link.
Example: ln -f /usr/lib/mozilla/plugins/libnpjp2.so

If you want to completely remove Java from your Linux box, the procedure of removing the symbolic link is described below.

    Open Terminal Window
    Log in as the super user
    Type: rm /usr/lib/mozilla/plugins/libnpjp2.so
    You will be prompted to remove symbolic link:
    rm: /usr/lib/mozilla/plugins/libnpjp2.so ?
    Type: Y

Java Uninstall
There are two ways to uninstall Java. Please use the method that you used when you installed Java. For example, if you used RPM to install Java, then use the RPM uninstall method.

    RPM uninstall
    Note: If you have RPM on your Linux box, you should first find out if Java is already installed using RPM. If Java is not installed using RPM, you should skip reading.
        Open Terminal Window
        Login as the super user
        Try to find jre package by typing: rpm -qa
        If RPM reports a package similar to jre-<version>-fcs, then Java is installed with RPM.

        Note: Normally, you do not need to uninstall Java with RPM, because RPM is able to uninstall the old version of Java when installing a new version! You may skip reading, unless you want to remove Java permanently.
        To uninstall Java, type: rpm -e jre-<version>-fcs

    Self-extracting file uninstall
        Find out if Java is installed in some folder. Common locations are /usr/java/jre_<version> or /opt/jre_nb/jre_<version>/bin/java/
        When you have located the folder, you may delete folder.
        Warning: You should be certain that Java is not already installed using RPM before removing the folder.
        Type: rm -r jre<version>
        For example: rm -r jre1.6.0

[hawk035]

hawk035  

 Re: Java in Linux

[Business Directory]

Sorry friend I don't have info about it.