An analysis of the example program of the--java programming idea of inheriting inner class

Programming | programs | inheriting | Examples about inheritance internal class--java programming thought sample program analysis;
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 ();
}
}

Program Run Result:
Egg2.yolk ()
New Egg2 ()
Egg2.yolk ()
Bigegg2.yolk ()
Bigegg2.yolk.f ()

Run Order:
1, Egg2 e2 = new BigEgg2 (); Subclasses call the parent class constructor before instantiating the parent class constructor to initialize the class member first;
There is a private yolk y = new yolk ();, y is initialized as a member of the EGG2 class first, the constructor of the Egg2 inner class yolk is called first, and the Egg2.yolk () is printed out;
2, call the Egg2 constructor, print out the Egg2.yolk ();
3, call the BigEgg2 constructor, because it insertyolk (new yolk ()); The new yolk here is an instance of the inner class of BigEgg2; This inner class inherits the inner class from the EGG2

, so we call the constructor of the yolk in Egg2 first, and print out egg2.yolk ();
4, call the Bigegg2.yolk constructor, print out the Bigegg2.yolk ();
5, E2.G (); Print out bigegg2.yolk ();

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