Return type of iterator() method in java

Question

I am a new-comer in Java and in process of learning. I need a an answer of following question supported with valid theory. Consider the following line-

Iterat         


        

Answer 1

The implementation is defined in AbstractList itself. Find it at its source code.

public abstract class AbstractList extends AbstractCollection implements List {
    private class Itr implements Iterator {
       ...
    }

    public Iterator iterator() {
       return new Itr();
    }
}

Try

System.out.println(new ArrayList().iterator().getClass().getName());

output

java.util.AbstractList$Itr