upward compatibility and backwards compatibility can actually be a different description of the same thing in two ways. For example, we targetJDK1.4 Platformthe developed program a can beJDK1.5 Platformand then we say:Program Aup compatibleJDK1.5 Platform, whileJdK1.5 Platformbackwards compatibleProgram B. If we targetJDK1.4 Platformdeveloped byProgram Anot inJDK1.5 Platformand then we say:Program Anon-upward compatible JDK1.5 Platform, whileJdK1.5 Platformnot backwards compatibleProgram B. Of course this does not happen. JDK Platform backwards compatibility with all Java programs。If we targetJDK1.5 Platformdeveloped byProgram Bdoes not useJDK1.5 Platformnew features that can beJDK1.4 Platformand then we can say:Program Bbackwards compatibleJDK1.4 Platform, whileJdK1.4 Platformup compatibleProgram B. If we targetJDK1.5 Platformprogram B developed because of the use ofJDK1.5 Platformnew features or other reasons that cannot beJDK1.4 Platformand then we can say:Program Bnot backwards compatibleJDK1.4 Platform, whileJdK1.4 PlatformNot up compatibleProgram B.
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Up-and backwards-compatible
