In this tutorial we will learn how to use the Java Iterator interface as Array. We will create an example print the multiple ArrayList at a time using the Iterator

• Java Array Iterator is an interface in the collection framework.
• Java ArrayList is a collection class and implements the List Interface.
• All the elements of the ArrayList can be traversed by the Iterator.
• There can be array of the Iterator interface to manipulate more than one ArrayList

Java Array Iterator with Example

import java.util.*;

public class arrayIterator {

	public static void main(String[] args) {
		int ar[][] = { { 1, 2, 3, 4 }, { 5, 6, 7, 8 }, { 9, 10, 11, 12 },
				{ 13, 14, 15, 16 } };

		ArrayList list[] = { new ArrayList(), new ArrayList(), new ArrayList(),
				new ArrayList() };
		for (int i = 0; i <= 3; i++) {
			for (int j = 0; j <= 3; j++) {
				list[i].add(ar[i][j]);
			}
		}
		Iterator it[] = { list[0].iterator(), list[1].iterator(),
				list[2].iterator(), list[3].iterator() };
		for (int k = 0; k <= 3; k++) {
			while (it[k].hasNext()) {
				System.out.print(it[k].next() + "\t");
			}
			System.out.println();
		}
	}
}

Output :

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Related Tags for Java Array Iterator with Example: