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Ace the AP Computer Science Exam for High Schoolers

Traversing an ArrayList

Explore how to traverse ArrayLists in Java using both standard and enhanced for loops. Understand the challenges of modifying an ArrayList during traversal and learn techniques to safely remove elements without skipping or causing errors. This lesson equips you with essential skills for managing dynamic data collections effectively.

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Just like we can use iteration statements to traverse arrays, we can apply them in the case of an ArrayList too.

Traversal with the for loop

Look at the program below.

Java
import java.util.ArrayList;
class ArrayListTraversal
{
    public static void main(String args[]) 
    {
        ArrayList<String> students = new ArrayList<String>();   // empty list
        // Adding elements
        students.add("James");
        students.add("Allen");
        for(int i = 0; i < students.size(); i++) // Traversing ArrayList
        {
            System.out.println(students.get(i));
        }
    }
}

Initially, we create an empty ArrayList with the name: students. Then, we add James and Allen to it. Now, look at line 13. We have a for loop that traverses students.size() times. At line 15 ...