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listnode in java

marktecher.com answered on September 28, 2022 Popularity 10/10 Helpfulness 2/10

answer listnode in java

listnode in java

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class ListNode<E> {
    ListNode<E> next;
    ListNode<E> prev; //only used for linking nodes in singly linked list
    ListNode<E> current; //also only used for linking nodes in singly linked list
    E data;
    private static int size = 0;

    public ListNode() {
        data = null;
        next = null;
        current = null;
        if(size > 0) { //changed from prev != null because no code to make prev not null
            prev.setNext(this);
        }
        size++;
    }
    public ListNode(E value) {
        data = value;
        next = null;
        current = this;
        System.out.println("current is " + current);
        if(size > 0) {
            prev.setNext(current);//this line causing npe
        }
        else
        {
            prev = current;
            System.out.println("prev now set to " + prev);
        }
        size++;
        System.out.println("after constructor, size is " + size);
    }

    public ListNode(E value, ListNode<E> n) {
        data = value;
        next = n;
        current = this;
        if(size > 0) {
            prev.setNext(this);
        }
        size++;
    }

    public void setNext(ListNode<E> n) {
        next = n;
    }
}

Popularity 10/10 Helpfulness 2/10 Language java

Source: stackoverflow.com

Tags: java

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Contributed on Sep 28 2022

marktecher.com

0 Answers Avg Quality 2/10

listnode in java

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