Set形式的数组，数组内容重复

package com.sicdt.library.core.utils;

import java.util.ArrayList;

import java.util.Collection;

import java.util.Iterator;

import java.util.Map;

import java.util.Set;

/**

 *

 * <br>类 名: ArraySet

 * <br>描 述: 自定义Set

 * <br>作 者: shizhenwei

 * <br>创 建: 2017年5月15日

 * <br>版 本: v0.0.2

 * <br>

 * <br>历 史: (版本) 作者 时间 注释

 */

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

    private ArrayList<E> list;

    public ArraySet() {

        list = new ArrayList<>();

    }

    public ArraySet(int initialCapacity){

        list = new ArrayList<>(initialCapacity);

    }

    public ArraySet(Collection<? extends E> c) {

        list = new ArrayList<>(c);

    }

    @Override

    public int size() {

        return list.size();

    }

    @Override

    public boolean isEmpty() {

        return list.isEmpty();

    }

    @Override

    public boolean contains(Object o) {

        return list.contains(o);

    }

    @Override

    public Iterator<E> iterator() {

        return list.iterator();

    }

    @Override

    public Object[] toArray() {

        return list.toArray();

    }

    @Override

    public <T> T[] toArray(T[] a) {

        return list.toArray(a);

    }

    @Override

    public boolean add(E e) {

        if(list.contains(e)){

            return false;

        }

        return list.add(e);

    }

    @Override

    public boolean remove(Object o) {

        return list.remove(o);

    }

    @Override

    public boolean containsAll(Collection<?> c) {

        return list.containsAll(c);

    }

    @Override

    public boolean addAll(Collection<? extends E> c) {

        if(c == null || c.isEmpty()) return false;

        for(E e: c){

            add(e);

        }

        return true;

    }

    @Override

    public boolean retainAll(Collection<?> c) {

        return list.retainAll(c);

    }

    @Override

    public boolean removeAll(Collection<?> c) {

        return list.removeAll(c);

    }

    @Override

    public void clear() {

        list.clear();

    }

    @Override

    public String toString() {

        return list == null ? "[]" : list.toString();

    }

    public static void main(String[] args) {

        Set<String> set = new ArraySet<>();

        set.add("aa");

        set.add("cc");

        set.add("bb");

        set.add("cc");

        System.out.println(set);

        Map<String, String> map = new ArrayMap<>();

        map.put("a", "aa");

        map.put("b", "bb");

        map.put("c", "cc");

        map.put("a", "dd");

        System.out.println(map);

        System.out.println(map.keySet());

        Iterator<String> it = map.keySet().iterator();

        while(it.hasNext()){

            String key = it.next();

            String value = map.get(key);

            System.out.println(key + "," + value);

        }

    }

}