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abstract methods are not implemented (not even a default one).
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This
is better than putting in a dummy procedure as a placeholder.
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Derived classes must eventually implement
them;
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if they
dont then they must be abstract classes themselves.
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Overriding is resolved at runtime.
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Abstract class is one that contains an
abstract method;
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need to be explicitly declared as such.
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Abstract classes may have non-abstract
methods & static fields.
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Abstract classes cannot be created (no
constructor),
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except using super()
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