You can iterate over an ArrayList using a lambda expression in Java 8 and higher versions. Here's an example:

import java.util.ArrayList;

public class ArrayListLambda {
    public static void main(String[] args) {
        ArrayList<String> list = new ArrayList<String>();
        list.add("Apple");
        list.add("Banana");
        list.add("Cherry");
        list.add("Date");
        
        list.forEach((str) -> System.out.println(str));
    }
}

In the above example, we define an ArrayList of String type with four elements. We use the forEach() method of the ArrayList class to iterate over the elements of the list using a lambda expression.

Inside the lambda expression, we use the variable str to represent each element of the list. We then print each element to the console using the System.out.println() method.

After running the above code, the output would be:

Apple
Banana
Cherry
Date

This program iterates over the ArrayList and prints each element to the console using a lambda expression. The forEach() method is a default method introduced in Java 8, which simplifies the iteration process by hiding the implementation details.