Inner Classes - Beginning Java 8 Language Features - page 45

public Iterator<String> titleIterator() {
// A local inner class - TitleIterator
class TitleIterator implements Iterator<String> {
int count = 0;
@Override
public boolean hasNext() {
return (count < titleList.size());
}
@Override
public String next() {
return titleList.get(count++);
}
} // Local Inner Class TitleIterator ends here
// Create an object of the local inner class and return the reference
TitleIterator titleIterator = new TitleIterator();
return titleIterator;
}
}
A TitleList object can hold a list of book titles. The addTitle() method is used to add a title to the list. The
removeTitle() method is used to remove a title from the list. The titleIterator() method returns an Iterator for
the title list. The titleIterator() method defines a local inner class called TitleIterator , which implements the
Iterator interface. Note that the TitleIterator class uses the private instance variable titleList of its enclosing
class. At the end, the titleIterator() method creates an object of the TitleIterator class and returns the object's
reference. Listing 2-4 shows how to use the titleIterator() method of the TitleList class.
Listing 2-4. Using a Local Inner Class
// TitleListTest.java
package com.jdojo.innerclasses;
import java.util.Iterator;
public class TitleListTest {
public static void main(String[] args) {
TitleList tl = new TitleList();
// Add two titles
tl.addTitle("Beginning Java 8");
tl.addTitle("Scripting in Java");
// Get the iterator
Iterator iterator = tl.titleIterator();
// Print all titles using the iterator
while (iterator.hasNext()) {
System.out.println(iterator.next());
}
}
}