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... and iOS? And I’ve only done upgrades, but I don’t believe any JVM is preinstalled on MacOS.

• pjmlp 7y ago
  Apple used to have its own JVM implementation. As for iOS, RoboVM, Codename ONE, GluonVM are three possible AOT compilers to native code.
  • duskwuff 7y ago
    Apple's JVM was MRJ, the Macintosh Runtime for Java. It became obsolete around 2004, during the transition to Mac OS X.
• cmiles74 7y ago
  Last time I used MacOS, it prompted me to install Java and then it did the install. I was in the Terminal, I am not sure what the interaction would look like if I had double-clicked a JAR file. I believe Apple donated their customizations (Swing L&F, launcher code, etc.) to OpenJDK.
  • dwaite 7y ago
    This is Apple's old build of Java 6, and is currently downloaded as needed for backward compatibility. Anything newer than that the third party is expected to bundle into their application.