How do I use iterators in Java?

How do I use iterators in Java?

In Java, an iterator is an object that allows you to traverse a collection, like a list or a set. You can use the Iterator interface to iterate through elements.

Can you show me a simple example of using an iterator?

Sure! Here's a basic example:

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

public class Main {
    public static void main(String[] args) {
        ArrayList<String> list = new ArrayList<>();
        list.add("Apple");
        list.add("Banana");
        list.add("Cherry");

        Iterator<String> iterator = list.iterator();
        while (iterator.hasNext()) {
            System.out.println(iterator.next());
        }
    }
}

What happens if I try to modify the collection while iterating?

If you modify the collection while iterating, you'll get a ConcurrentModificationException. To safely modify the collection, use the iterator's remove() method.

Are there any alternatives to using iterators in Java?

Yes, you can use enhanced for-loops (for-each loops) or streams in Java 8 and above for more concise iteration.