Java基础之字符串数组Array进行去重

写出一段算法,用于对字符串数组进行去重，要求尽量简洁

举例：

* 输入：
* {"cc","dd","aa","cc","gg","dd","ee"}
* 输出：
* {"cc","dd","aa","gg","ee"}

ArrayList去重

通过list.contains()方法

    /**
     * 通过list.contains()方法
     *
     * @param arrays
     * @return
     */
    public static String[] dealContains(String[] arrays) {
        ArrayList arrayList = new ArrayList();
        for (int i = 0; i < arrays.length; i++) {
            String array = arrays[i];
            if (!arrayList.contains(array)) {
                arrayList.add(array);
            }
        }
        String[] b = (String[]) arrayList.toArray(new String[arrayList.size()]);
        return b;
    }

Set去重

TreeSet对字符串数组去重并排序

    /**
     * TreeSet对字符串数组去重并排序
     *
     * @param arrays
     * @return
     */
    public static String[] dealTreeSet(String[] arrays) {
        TreeSet<String> set = new TreeSet<String>();
        for (String s : arrays) {
            set.add(s);
        }

        return  set.toArray(new String[0]);
    }

HashSet根据元素的hashCode值来决定元素的存储位置

    /**
     * HashSet根据元素的hashCode值来决定元素的存储位置
     * 顺序不能保证
     *
     * @param arrays
     * @return
     */
    private static String[] dealHashSet(String[] arrays) {
        HashSet<String> hashSet = new HashSet<String>();
        for (String s : arrays) {
            hashSet.add(s);
        }

        return hashSet.toArray(new String[0]);
    }

LinkedHashSet以元素的添加顺序输出

    /**
     * LinkedHashSet根据元素的hashCode值来决定元素的存储位置
     * 以元素的添加顺序访问集合的元素
     *
     * @param arrays
     * @return
     */
    private static String[] dealLinkedHashSet(String[] arrays) {
        LinkedHashSet<String> linkedHashSet = new LinkedHashSet<String>();
        for (String s : arrays) {
            linkedHashSet.add(s);
        }

        return linkedHashSet.toArray(new String[0]);
    }