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question about ==

 
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When using == to compare reference variables, the compiler will verify that the classes are the same or in the same inheritance hierarchy, otherwise it'll throw a compiler error


can you guys provide example(s) of this statement? specially when the compiler might throw a compilation error...
 
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Andres, is exactly the same as with the instanceof operator or casting. If in the above example you try:
if (d instanceof D2) {} // compiler error!
or:
d = (D2) d2; // compiler error!
They must be in the same inheritence hierarchy.
Miki
 
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