50 lines
1.1 KiB
Java
50 lines
1.1 KiB
Java
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//: reusing/FinalOverridingIllusion.java
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// It only looks like you can override
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// a private or private final method.
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import static net.mindview.util.Print.*;
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class WithFinals {
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// Identical to "private" alone:
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private final void f() { print("WithFinals.f()"); }
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// Also automatically "final":
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private void g() { print("WithFinals.g()"); }
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}
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class OverridingPrivate extends WithFinals {
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private final void f() {
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print("OverridingPrivate.f()");
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}
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private void g() {
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print("OverridingPrivate.g()");
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}
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}
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class OverridingPrivate2 extends OverridingPrivate {
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public final void f() {
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print("OverridingPrivate2.f()");
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}
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public void g() {
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print("OverridingPrivate2.g()");
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}
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}
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public class FinalOverridingIllusion {
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public static void main(String[] args) {
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OverridingPrivate2 op2 = new OverridingPrivate2();
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op2.f();
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op2.g();
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// You can upcast:
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OverridingPrivate op = op2;
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// But you can't call the methods:
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//! op.f();
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//! op.g();
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// Same here:
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WithFinals wf = op2;
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//! wf.f();
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//! wf.g();
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}
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} /* Output:
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OverridingPrivate2.f()
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OverridingPrivate2.g()
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*///:~
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