?? finaloverrideex.java
字號:
// reusing/FinalOverrideEx.java
// TIJ4 Chapter Reusing, Exercise 21, page 269
/* Create a class with a final method. Inherit from that class and attempt to
* override that method.
*/
import static net.mindview.util.Print.*;
class WithFinal {
final void f() { print("WithFinal.f()"); }
void g() { print("WithFinal.g()"); }
final void h() { print("WitFinal.h()"); }
}
class OverrideFinal extends WithFinal {
// attempt to override:
// public final void f() { print("OverrideFinal.f()"); } // no can do
@Override public void g() { print("OverrideFinal.g()"); } // OK, not final
// final void h(); { print("OVerrideFinal.h()"); } // cannot override final
}
public class FinalOverrideEx {
public static void main(String[] args) {
OverrideFinal of = new OverrideFinal();
of.f();
of.g();
of.h();
// Upcast:
WithFinal wf = of;
wf.f();
wf.g();
wf.h();
}
}
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