OT: Java Support on "other" platforms

OK, Bit of a cheek to ask here, but I'm developing a Java Swing application *ON* SusE linux, so I'd like to know something about potential cross-platform support without asking too many different groups or starting flame wars :-) My little Java 1.3.1_02 program works just fine of SuSE and WinME (via "DOS" command window) But specifically does similar *EASY* access exist for WinXP or a typical "modern" Macintosh? Chris Last time I used a "Mac" was in the early eighties. Ah, fond memories... :-)