Inner Classes...

Hello, again)

In the Oracle's tutorial of the Inner Classes, it says:

Quote:

---

To instantiate an inner class, you must first instantiate the outer class. Then, create the inner object within the outer object with this syntax:

OuterClass.InnerClass innerObject = outerObject.new InnerClass();

---

and after that, they bring an example with some program, which has inner class - array iterator.
here is itself.

But I can't find there any sign of the Inner Class Constructor...
So, how the inner class can be instantiated, if it has no constructor? Which constructor becomes default for it?

The inner class is InnerEvenIterator. It has a constructor, all classes do. If there no constructor explicitly given in the code then a no argument constructor that does nothing is assumed.

The use of the constructor is in the printEven() method:

Code:

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public void printEven() {
    //print out values of even indices of the array
    [color=blue]InnerEvenIterator iterator = this.new InnerEvenIterator();[/color]
    while (iterator.hasNext()) {
        System.out.println(iterator.getNext() + " ");
    }
}

---

The differences are that the outer class is not named explicitly ie it is "InnerEvenIterator iterator = ..." instead of "DataStructure.InnerEvenIterator iterator = ...". That's because the printEven() method is actually part of the DataStructure class. Also "this" is used where the example code has "outerObject": in printEven() this is the outer object (and it is the only variable there is for this object).