自己动手写写：HashSet、LinkedHashSet源码浅析

这篇文章我只是作为一个简要的分析。

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首先可以看看之前写的两篇的博文，只要你熟悉了下面这两个类的源码就显得很简单了！

自己动手写写：HashMap源码浅析

自己动手写写：LinkedHashMap源码浅析

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先来介绍下HashSet吧！

/**                                                                     * Constructs a new, empty linked hash set.  (This package private      * constructor is only used by LinkedHashSet.) The backing              * HashMap instance is a LinkedHashMap with the specified initial       * capacity and the specified load factor.                              *                                                                      * @param      initialCapacity   the initial capacity of the hash map   * @param      loadFactor        the load factor of the hash map        * @param      dummy             ignored (distinguishes this            *             constructor from other int, float constructor.)          * @throws     IllegalArgumentException if the initial capacity is less *             than zero, or if the load factor is nonpositive          */                                                                    HashSet(int initialCapacity, float loadFactor, boolean dummy)          {                                                                          map = new LinkedHashMap<E, Object>(initialCapacity, loadFactor);   }                                                                      

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?此构造函数的访问权限是default，即同包下可见！LinkedHashSet就是通过此构造函数，通过维护这一个LinkedHashMap来实现的。