On Red Hat based Linux systems, download the. Packages are provided by Oracle in RPM format (for installation on Red Hat Linux based systems such as Red Hat Enterprise Linux, Fedora and CentOS) and as a tar archive for other Linux distributions such as Ubuntu.

Open the downloaded disk image (.dmg file) and double-click on the icon to install the Java package (Figure 2-1):įirst, if the chosen development system is running the 64-bit version of Ubuntu then it is essential that a 32-bit library support package be installed: sudo apt-get install lib32stdc++6Īs with Windows based JDK installation, it is possible to install the JDK on Linux by downloading the appropriate package from the Oracle web site, the URL for which is as follows:

On the Oracle Java web page, locate and download the Java SE 7 JDK installation package for Mac OS X.

In the event that Java is not installed, issuing the “java” command in the terminal window will result in the appearance of a message which reads as follows together with a dialog on the desktop providing a More Info button which, when clicked will display the Oracle Java web page: No Java runtime present, requesting install Java HotSpot(TM) 64-Bit Server VM (build 24.79-b02, mixed mode) Java(TM) SE Runtime Environment (build 1.7.0_79-b15) To confirm the presence or otherwise of Java, open a Terminal window and enter the following command: java -versionĪssuming that Java is currently installed, output similar to the following will appear in the terminal window: java version '1.7.0_79-b15' Java is not installed by default on recent versions of Mac OS X.

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