TaskList Class

import java.util.*;

public class TaskList implements Iterable{
    private Task[] tasks;
    private int counter;

    public TaskList(int n) {
        tasks = new Task[n];
    }

// 2.1
    public String toString() {
        String result = "[";
        for (int i = 0; i < counter; i++)
            if (!tasks[i].isDone()) {
                result = result + tasks[i];
            }
        result = result + "]";
        return result;
    }

    public void add(String ds, Date d) {
        if (counter < tasks.length) {
            tasks[counter] = new Task(ds, d);
            counter++;
        }
    }

    //2.2
    protected TaskList clone() throws CloneNotSupportedException {
        TaskList t = (TaskList) super.clone();
        t.tasks = (Task[]) t.tasks.clone();
        for (int i = 0; i < counter; i++)
            t.tasks[i] = (Task) t.tasks[i].clone();

        return t;
    }
public int getCounter() {return counter;}

public Task getTask(int i) {
    return tasks[i];
}

    //2.3
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        TaskList t = (TaskList) obj;

        for (int i = 0; i < counter; i++)
            if (!tasks[i].isDone()) {
                int j;
                for (j = 0; j < t.counter; i++)
                    if (tasks[i].equals(t.tasks[j]))
                        break;
                if (j == t.counter)
                    return false;
            }
        for (int i = 0; i < t.counter; i++)
            if (!t.tasks[i].isDone()) {
                int j;
                for (j = 0; j < counter; i++)
                    if (t.tasks[i].equals(tasks[j]))
                        break;
                if (j == counter)
                    return false;
            }

        return true;
    }

    public Iterator iterator() {

        return null;
    }

}