19.基於LinkedList實現set

package com.cl.set;

public class LinkedListSet<E> implements Set<E> {

    private LinkedList<E> list;

    public LinkedListSet() {
        list = new LinkedList<>();
    }

    //O(n)
    @Override
    public void add(E e) {
        if(!list.contains(e))
            list.addFirst(e);

    }

    //O（n）
    @Override
    public void remove(E e) {
        list.removeElement(e);
    }

    //O(n)
    @Override
    public boolean contains(E e) {
        return list.contains(e);
    }

    @Override
    public int getSise() {
        return list.getSize();
    }

    @Override
    public boolean isEmpty() {
        return list.isEmpty();
    }


}

其中LinkedList是自己實現的單鏈表，參考：https://mp.csdn.net/postedit/88812059