MRJ : Java Glossary

I have left this tombstone entry for historical interest.

imac logo MRJ
Was Apple’s Macintosh Runtime for Java, the Java runtime for MacOS computers. Now Macs use Oracle JDK/JREs like most other platforms. Apple was always behind and treat Java with contempt. Equivalent of the JRE (Java Runtime Environment) on other platforms. Comes with MacOS system CD (Compact Disc) as of MacOS 8. Version numbers are a bit screwy: MRJ (Macintosh Runtime for Java) 1.0 implements JDK (Java Development Kit) 1.0.2, MRJ 2.0 implements Java version 1.1, MRJ 1.1 implements JDK 1.1.6. MRJ is a runtime only — for development tools, you need the MRJ SDK (Software Development Kit). Apple provides the entire JDK. They don’t have a separate stripped down JRE for end users. Signed Applets don’t run in IE (Internet Explorer) or Netscape, though they should in IE 5.0 and Netscape 5.0. In the meantime you can test with the AppletViewer.
IE: Internet Explorer

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