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I just want to run a .jar app on macOS, but I can not find an emulator. Does anyone know one?
.jar
java -jar foo.jar
Java is a multi-platform language. There are no emulators, just JVMs. Even Macs have a JVM implementation.
In a command prompt, try:
java -jar <your jar>
You do not need an emulator, you can simply use the Java VM for Mac.
java -jar foo.jar
should work, actually.