Practice-It! logo

ArrayIntList mirror

Added by: Marty Stepp
Language: Java

Write a method mirror that doubles the size of a list of integers by appending the mirror image of the original sequence to the end of the list. The mirror image is the same sequence of values in reverse order. For example, if a variable called list stores this sequence of values:

[1, 3, 2, 7]

and we make the following call:


then it should store the following values after the call:

[1, 3, 2, 7, 7, 2, 3, 1]

Notice that it has been doubled in size by having the original sequence appearing in reverse order at the end of the list. You may not make assumptions about how many elements are in the list. Because adding these elements might overrun the capacity of the underlying array, you may need to call ensureCapacity to enlarge this array.

Assume you are adding to the ArrayIntList class with following fields:

public class ArrayIntList {
    private int[] elementData;
    private int size;

    public void add(int value) { ... }
    public void add(int index, int value) { ... }
    public void ensureCapacity(int capacity) { ... }

    // your code goes here

Related Files:

Partial class problem: For this problem, you are supposed to submit code that will become part of an existing Java class as described. You do not need to write the complete class, just the portion described in the problem.

You must log in before you can solve this problem.

Log In

indent Re-indent

If you do not understand how to solve a problem or why your solution code doesn't work, please contact your TA or instructor.

If something seems wrong with the Practice-It system itself (errors, slow performance, incorrect problem descriptions/tests, etc.), please contact us.

Is there a problem?
Contact a Practice-It administrator.