logo Practice-It logo

Main Page → Problems → Solve a Problem

ArrayListMystery

Language/Type: Java ArrayList Collections mystery
Author: Roy McElmurry

Consider the following method:

public static void mystery1(ArrayList<Integer> list) { 
    for (int i = 0; i < list.size(); i += 2) { 
        int element = list.get(i); 
        list.remove(i); 
        list.add(element); 
    } 
    System.out.println(list); 
}

Write the output produced by the method when passed each of the following ArrayLists:

[2, 4, 6, 8]
[10, 20, 30, 40, 50, 60]
[-4, 16, 9, 1, 64, 25, 36, 4, 49]

You must log in before you can solve this problem.


Log In

If you do not understand how to solve a problem or why your solution doesn't work, please contact your TA or instructor.
If something seems wrong with the site (errors, slow performance, incorrect problems/tests, etc.), please

Is there a problem? Contact a site administrator.