45 lines
1.0 KiB
Java
45 lines
1.0 KiB
Java
// innerclasses/BigEgg2.java
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// (c)2020 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://OnJava8.com for more book information.
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// Proper inheritance of an inner class
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class Egg2 {
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protected class Yolk {
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public Yolk() {
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System.out.println("Egg2.Yolk()");
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}
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public void f() {
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System.out.println("Egg2.Yolk.f()");
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}
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}
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private Yolk y = new Yolk();
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Egg2() { System.out.println("New Egg2()"); }
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public void insertYolk(Yolk yy) { y = yy; }
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public void g() { y.f(); }
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}
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public class BigEgg2 extends Egg2 {
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public class Yolk extends Egg2.Yolk {
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public Yolk() {
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System.out.println("BigEgg2.Yolk()");
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}
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@Override
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public void f() {
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System.out.println("BigEgg2.Yolk.f()");
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}
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}
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public BigEgg2() { insertYolk(new Yolk()); }
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public static void main(String[] args) {
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Egg2 e2 = new BigEgg2();
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e2.g();
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}
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}
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/* Output:
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Egg2.Yolk()
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New Egg2()
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Egg2.Yolk()
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BigEgg2.Yolk()
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BigEgg2.Yolk.f()
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*/
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