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if you wanna code a desktop application in java for windows, mac and linux, will the code be the same for all of them?
and you just change the GUI so that the Windows application will be more Windows-like and so on?
how does it work without digging into details?
One of Java’s selling points is that is is “Write Once, Run Anywhere” (pretty much).
The compiled bytecode is executed by the Java Virtual Machine (JVM). The JVM is specific to the platform that it runs on but the same bytecode can be executed by any platform that has a JVM. The code does not have to be recompiled.
Swing is Java’s cross-platform GUI toolkit. You can configure it so that it has a GUI that looks the same across different platforms (it won’t look native on any of them), or you can tell it to use the most appropriate look-and-feel for the platform that it is executing on. So if you run on Windows it will look like a Windows app, if you run on OS X it will look like a native Mac app.