Basic HTML version of Foils prepared 7 Sept 1997

Foil 48 Java Features -- It's Portable

From Introduction to Java to be used in (Scientific) Computing Basic Simulation Track for Computational Science CPS615 -- Fall Semester 97. by Geoffrey C. Fox, Nancy McCracken
1 Java language offers a uniform abstract (virtual) machine model which is identical for all platforms.
2 SUN owns the Java Virtual Machine -- it is universal while classes can be added by any user
3 Unlike in C/C++ where various integers match the architecture of a physical machine at hand, Java byte, char short, int and long are always of the same size, equal to 8, 16, 16(unicode), 32 and 64 bits, respectively.
  • No header files, preprocessors,#define etc.
  • floating point is always IEEE 754 (not quite right yet!)
4 Differences between vendor specific windowing environments (X Windows, MS Windows, Macintosh) are removed in terms of the Abstract Windowing Toolkit (AWT) metaphor.
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