NativeJ is a Java EXE maker. The executable generated by NativeJ is uniquely customized to launch your Java application under Windows. NativeJ is not a compiler! Think of NativeJ-generated executable as a "binary batch file", with the following advantages:

Custom icon. Each executable is represented by a unique icon, just like native apps.

Native behaviour. When the user double-clicks on the EXE to run your application, there won't be an annoying console window popping up briefly.

Holger Schulz Faster startup. Executing a batch file involves a great deal of overhead, including loading the command processor and parsing the batch file. The native EXE loads the JVM directly, resulting in snappier program startup.

Native splash screen. Display a splash screen of your choice immediately upon startup while your application loads.

Unique process name. When viewed in the task list, the user sees tomcat.exe, or jedit.exe, instead of the nondescript java.exe, or javaw.exe.

Install as service. NativeJ generates executables that can be installed as a Win32 service natively.