ToDo List (with.Java)

In this article, we learned about to-do lists (with.Java).

We’ll be solving coding test problems, reflecting on the problems we’ve solved, and learning about other ways to solve them.

Let’s start with the problem.

Problem

Given a string array todo_list containing a list of things to do today and a boolean array finished indicating whether you have finished each task now, write a solution function that returns an array of strings containing the unfinished tasks in order from todo_list.

Example input and output

My solution to the problem

import java.util.*;
class Solution {
    public String[] solution(String[] todo_list, boolean[] finished) {
        ArrayList<String> answer = new ArrayList<String>();

        for(int i = 0; i < finished.length; i++){
            if(finished[i] == false){
                answer.add(todo_list[i]);
            }
        }
        String[] result = new String[answer.size()];
        for(int j = 0; j < answer.size(); j++){
            result[j] = answer.get(j);
        }
        } return result;
    }
}

Solution

ArrayList answer = new ArrayList(); : Create a string ArrayList answer to store a list of to-dos that have not yet been completed.

for(int i = 0; i < finished.length; i++) : Iterate over the finished array, checking each to-do for completion.

if(finished[i] == false) : If the current to-do is not finished (i.e., if finished[i] is false), add that to-do to the answer ArrayList.

String[] result = new String[answer.size()];: Create an array of strings result that fits the size of answer ArrayList.

for(int j = 0; j < answer.size(); j++) : Iterate over the answer ArrayList, copying each to-do to the result array.

return result; : Finally, return the result array with the list of to-dos that have not yet been completed.