中内部类继承覆盖的例子...

[iamanewbie]

class Egg2 {
protected class Yolk {
public Yolk() {
System.out.println("Egg2.Yolk()");
}
public void f() {
System.out.println("Egg2.Yolk.f()");
}
}
private Yolk y = new Yolk();
public Egg2() {
System.out.println("New Egg2()");
}
public void insertYolk(Yolk yy) { y = yy;}
public void g() { y.f();}
}

public class BigEgg2 extends Egg2 {
public class Yolk extends Egg2.Yolk {
public Yolk() {
System.out.println("BigEgg2.Yolk()");
}
public void f() {
System.out.println("BigEgg2.Yolk.f()");
}
}
public BigEgg2() { insertYolk(new Yolk()); }
public static void main(String[] args) {
Egg2 e2 = new BigEgg2();
e2.g();
}
}


output：

Egg2.Yolk()
New Egg2()
Egg2.Yolk()
BigEgg2.Yolk()
BigEgg2.Yolk.f()

请明白的解释一下，thx.

[shihb]

奇怪？不是应该先运行构建器吗？怎么不打New Egg2()？

[shihb]

会不会是因为内部类的问题呢？