Question

Create a method in Java that adds a task to a list and returns false if the task is already part of the list. Create another method to remove tasks from the list, and returns false if the task is not part of the list.

Answer 1

import java.util.ArrayList;
import java.util.List;

public class Tasks {

    public static boolean addTask(List<String> list, String task) {
        if(list.contains(task)) {
            return false;
        } else {
            list.add(task);
            return true;
        }
    }

    public static boolean removeTask(List<String> list, String task) {
        if(list.contains(task)) {
            list.remove(task);
            return true;
        } else {
            return false;
        }
    }

    public static void main(String[] args) {
        List<String> tasks = new ArrayList<>();
        addTask(tasks, "task1");
        addTask(tasks, "task2");
        addTask(tasks, "task3");
        addTask(tasks, "task1");
        System.out.println(tasks);
        removeTask(tasks, "task1");
        System.out.println(tasks);
    }

}

[taskl, task2, task3] [task2, task3] Process finished with e xit code 0