To
create our own custom iterator we have to follow these steps, which are
described below.
Step
1:- First create your own custom class that implements the Iterable interface to return an iterator.and compile this file, the code is following..
import java.util.ArrayList;
import java.util.Iterator;
public class Animal implements
Iterable {
private
ArrayList animal = new ArrayList();
public
Animal(ArrayList animal) {
this.animal = animal;
}
public ArrayList
getAnimal() {
return animal;
}
@Override
public
Iterator iterator() {
return new AnimalIterator(this);
}
}
Step
2:- now let create an iterator AnimalIterator for Animal class..and compile this file,the code is following..
import java.util.ArrayList;
import java.util.Iterator;
public class AnimalIterator
implements Iterator
private
ArrayList animal;
private int position;
public
AnimalIterator(Animal animalBase) {
this.animal = animalBase.getAnimal();
}
@Override
public boolean
hasNext() {
if (position
< animal.size())
return true;
else
return false;
}
@Override
public
Object next() {
Object aniObj = animal.get(position);
position++;
return aniObj;
}
@Override
public void
remove() {
animal.remove(position);
}
}
Step 3:- Now create a main class having name TestIterator. compile and run this file.
import java.util.ArrayList;
public class TestIterator {
public static void
main(String args[]) {
ArrayList
animalList = new ArrayList();
animalList.add("Horse");
animalList.add("Lion");
animalList.add("Tiger");
Animal animal = new Animal(animalList);
for (String animalObj
: animal) {
System.out.println(animalObj);
}
}
}
Output:
