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    <blockquote> <p><strong><em>Is Java a cross platform?</em></strong></p> </blockquote> <p>Java is cross platform in the sense that a <em>compiled</em> Java program runs on all platforms for which there exists a JVM. (This holds for all major operating systems, including Windows, Mac OS and Linux.)</p> <blockquote> <p><strong><em>I mean I can develop Java application in windows and use it in mac and Linux?</em></strong></p> </blockquote> <p><strong>Yes,</strong> this is possible.</p> <p>This (and the security aspect) is one of the main advantages of running the programs in a virtual machine.</p> <blockquote> <p><strong><em>If yes how?</em></strong></p> </blockquote> <ul> <li>Write your application in Java (In <code>.java</code> files)</li> <li>Compile your application using Eclipse or javac (into <code>.class</code> files)</li> <li>(Optionally) Bundle your .class files in an executable (<code>.jar</code> file)</li> </ul> <p>The very same <code>.jar</code> file can be distributed and executed on Windows systems, Mac systems, etc.</p> <blockquote> <p><strong><em>I find application written in Java, has two setup file one for windows and other for mac. This confuses me.</em></strong></p> </blockquote> <p>This is because some applications rely on platform-specific features. They are then bundled with different platform-specific libraries.</p> <p>Unless you're developing an application that itself relies on platform-specific features, (such as for instance low-level system calls), you should be able to do just fine with ordinary Java.</p> <p><strong>Important comment</strong> by <a href="https://stackoverflow.com/users/57695/peter-lawrey">@Peter Lawrey</a>:</p> <blockquote> <p><em>It can be while the application is platform independent, the setup program is not. e.g. IntelliJ has three platform specific installers which are not written in Java, but have a zip which you can just unzip on any platform and it will work.</em></p> </blockquote>
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    1. CObut I find application written in java , has two setup file one for windows and other for mac , is it strange
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    2. COThat is just because they may rely on low-level libraries that interact with the operating system in a native way. So unless you're relying on some Linux specific system call etc, you should be just fine with ONE set of class files for every system.
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    3. CO@AMH, It can be while the application is platform independant, the setup program is not. e.g. IntelliJ has three platform specific installers which are *not written in Java*, but have a zip which you can just unzip on any platform and it will work.
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