Basic HTML version of Foils prepared Sept 21 1998

Foil 22 Java Language -- Types of Classes - II

From Java Tutorial 98- 2: Java Language and Object Oriented Techniques NAVO Tutorial -- Sept 23 1998. by Geoffrey C. Fox, Nancy McCracken
1 threadsafe: Instance or static variables will never change asynchronously and so can use compiler optimizations such as assigning to registers. Next modifier -- final -- is also valuable to compilers
2 final -- Cannot have a subclass for classes
  • cannot be overridden for methods
  • final variables have a constant value e.g.
    • final int ageatdeath = 101;
  • transient -- specifies that objects are not persistent
  • Note most of these modifiers can be used either for a class or an object -- a particular instance of a class
    • abstract only makes sense for a class and transient is perhaps more useful on an object basis
in Table To:

© Northeast Parallel Architectures Center, Syracuse University, npac@npac.syr.edu

If you have any comments about this server, send e-mail to webmaster@npac.syr.edu.

Page produced by wwwfoil on Sat Nov 28 1998