Basic HTML version of Foils prepared September 1 99

Foil 35 Java Features -- It's Dynamic

From Introduction to Java Language and Applets CPS406/606 Fall Semester 1999 -- September 2 99. by Nancy J. McCracken, Geoffrey C. Fox


1 Java model is more dynamic than C++ and closer to Smalltalk or Perl.
2 Subclasses don't need to to be recompiled after superclass implementation is updated.
3 C++ has "fragile superclass" problem where must recompile children if change anything (method/instance variable) in a superclass or referenced class -- Java resolves references at runtime and avoids this.
4 Classes have runtime representation (implemented in terms of the Class class) which allows one to look up type of a given object instance at runtime (in C cannot know if pointer is to integer or browser!)

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