ArrayList and Iterator: Example 2

This Java code defines a class named ArrayListIteratorExample that contains a main method.

The main method creates an ArrayList of type Integer named list. It then uses the add method to add three integers (2, 4, and 6) to the list.

Next, the code creates an Iterator named iter for the list by calling the iterator method on the list object. The Iterator is an interface that is used to traverse elements in a collection and is commonly used to traverse ArrayLists.

Finally, the code uses a while loop to iterate through the list using the Iterator. The while loop continues as long as the iter.hasNext() method returns true, indicating that there are more elements in the list to be processed. Inside the while loop, the code calls the iter.next() method to retrieve the next element in the list and prints it to the console using System.out.println. The loop continues until all elements have been processed and iter.hasNext() returns false.

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

class ArrayListIteratorExample {
	public static void main(String[] args) {
		ArrayList<Integer> list = new ArrayList<Integer>();
	
		list.add(2);
		list.add(4);
		list.add(6);

		// output elements using iterator
		Iterator<Integer> iter = list.iterator();
		while (iter.hasNext()) {
			System.out.println(iter.next());
		}
	}
}

Output

2
4
6