Important Notice:

Practice-It will be discontinued as of November 1st, 2024. After this date, the website will remain online for a transitional period, but login will be restricted to University of Washington NetID authentication. This marks the next phase towards the platform's full retirement. Thank you for your use and support of the application over the years.

If you are looking for an alternative, a similar tool, CodeStepByStep, was developed independently by the original author of Practice-It, and is available at codestepbystep.com**

logo Practice-It logo

Main Page → Problems → Solve a Problem

removeEvens

Related Links:
Author: Whitaker Brand (on 2019/09/19)

Write a method removeEvens that removes the values in even-numbered indexes from a list, returning a new list containing those values in their original order. For example, if a variable list1 stores these values: 

list1: [8, 13, 17, 4, 9, 12, 98, 41, 7, 23, 0, 92]

And the following call is made: 

LinkedIntList list2 = list1.removeEvens();

After the call, list1 and list2 should store the following values: 

list1: [13, 4, 12, 41, 23, 92]
list2: [8, 17, 9, 98, 7, 0]

Notice that the values stored in list2 are the values that were originally in even-valued positions (index 0, 2, 4, etc.) and that these values appear in the same order as in the original list. Also notice that the values left in list1 also appear in their original relative order. Recall that LinkedIntList has a zero-argument constructor that returns an empty list. You may not call any methods of the class other than the constructor to solve this problem. You are not allowed to create any new nodes or to change the values stored in data fields to solve this problem; You must solve it by rearranging the links of the list.

Assume that you are adding this method to the LinkedIntList class as defined below: 

public class LinkedIntList {
    private ListNode front;   // null for an empty list
    ...
}
Type your solution here:


This is a partial class problem. 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

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.