Inheritance

I was thinking about how the Java book I have fails to cover any Object-oriented concepts other than just the basic class (no access levels, inheritance, or polymorphism), when I wondered how far one could go with inheritance. Does inheritance apply to C++ structs? (I'd guess so, but that's just me.) Can a struct inherit from a class or vice versa? Does inheritance apply to *gasps* Unions in any way? (I doubt this.)
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