Question

public boolean addSubClass(Week week, int startTime, int endTime, boolean[] weekNumber) {

    boolean result = false;

    boolean repeat = false; 

    if (repeat != true) {
        SubClass s = new SubClass(week);
        s.updateTime(startTime, endTime);
        s.updateTime(weekNumber);
        subClassList.addLast(s);

        result = true;
    }
    return result;
}

situation: this is part of my code. I got 3 differnet startTime, endTime and weekNumber in my file, when I check for first startTime and endTime, these integers are added into the list successfully, but when I check for the weekNumber, it always get the Last one that on the list.
question: can I add boolean array into the linked list???

Answer 1

In Java a LinkedList (or any other generic collection, for that matter) can only contain elements of the same type. In your question it seems (you should post the code) that you have a list of Integers, and that’s the only type of objects you can add to the list: Integers. With addLast you can’t add an array of booleans; not even an array of Integers, only a single Integer.

What you could do for adding several items of the same type at the end of the list, is using addAll, like this:

LinkedList<Integer> list1 = new LinkedList<Integer>();
list1.add(1);
list1.add(2);
LinkedList<Integer> list2 = new LinkedList<Integer>();
list2.add(3);
list2.add(4);
list1.addAll(list2); // now list1 has elements [1, 2, 3, 4]