Java Reference
In-Depth Information
class LCDemo
public static void main(String[] args)
EnclosingClass ec = new EnclosingClass();
After instantiating EnclosingClass , Listing 3-13 ' s main() method invokes
m(10) . The called m() method multiplies this argument by 2, instantiates
LocalClass ,whose <init>() methodassignstheargumentandthedoubledvalue
puts the LocalClass instance fields. The following output results:
Local classes help improve code clarity because they can be moved closer to where
theyareneeded.Forexample, Listing3-14 declaresan Iterator interfaceandare-
factored ToDoList classwhose iterator() methodreturnsaninstanceofitslocal
Iter class as an Iterator instance (because Iter implements Iterator ).
Listing 3-14. The Iterator interface and the refactored ToDoList class
interface Iterator
boolean hasMoreElements();
Object nextElement();
class ToDoList
private ToDo[] toDoList;
private int index = 0;
ToDoList(int size)
toDoList = new ToDo[size];
Iterator iterator()
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