The language itself derives much of its syntax from C and C++ but has a simpler object model and fewer low-level facilities. JavaScript, a scripting language, shares a similar name and has similar syntax, but is not directly related to Java.
Currently Ubuntu has the following Java packages
sun-java6-bin - Contains the binaries
sun-java6-demo - Contains demos and examples
sun-java6-doc - Contains the documentation
sun-java6-fonts - Contains the Lucida TrueType fonts from the JRE
sun-java6-jdk - Contains the metapackage for the JDK
sun-java6-jre - Contains the metapackage for the JRE
sun-java6-plugin - Contains the plug-in for Mozilla-based browsers
sun-java6-source - Contains source files for the JDK
Installing the Java Runtime Environment
First you need to check multiverse repository enabled or not after that open a terminal window. Since you are going to be installing the JRE and the web
sudo apt-get install sun-java6-jre sun-java6-plugin sun-java6-fonts
Once it downloads the packages and begins the installation, you’ll get a screen that contains the Sun Operating
You’ll see a dialog that asks you if you agree with the DLJ license terms. Select Yes, and hit Enter; the JRE will finish installing.
Testing Java Runtime Environment
You’ll want to confirm that your system is configured properly for Sun’s JRE. This is a two-step process.
First, check that the JRE is properly installed by running the following command from a terminal.
java -version
You should get similar output
Testing Java Plugin for Firefox
open Firefox and typing about:plugins in the address bar and check for java plugin
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