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
Java language offers a uniform abstract (virtual) machine model which is identical for all platforms.
SUN owns the Java Virtual Machine -- it is universal while classes can be added by any user
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!)
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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