How to implement iterator as an attribute of a class in Java

Question

let\'s say I have this simple MyArray class, with two simple methods: add, delete and an iterator. In the main method we can see how it is supposed to be used:

Answer 1

Iterator is an interface . Iterator which means only Object can go here (E) . Iterator is legal but Integer is not because int is primitive data type

You can change the array to the ArrayList and then iterate over this arraylist. I added getIterator() method that returns the arraylist.iterator() and test it in main() method

import java.util.ArrayList;
import java.util.Iterator;

public class MyArray {
 int start;
 int end;
 ArrayList arr;


 public MyArray() {
  this.start = 0;
  this.end = 0;
  arr = new ArrayList(500);
 }

 public void add(int el) {
  arr.add(el);
  this.end++;
 }

 public void delete() {
  arr.remove(arr.size()-1);
  this.start++;
 }

 public Iterator getIterator(){
  return arr.iterator();
 }

 public static void main(String[] args) {
  MyArray m = new MyArray();

  m.add(3);
  m.add(299);
  m.add(19);
  m.add(27);

  Iterator it = m.getIterator();

  while(it.hasNext()){
   System.out.println(it.next());
  }

 }

}