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<div align="center" class="title">JAVA程序員必讀：基礎篇(6)---接口和包</div>
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<div align="center"><font color="#666666">編譯：ZSC/太平洋網絡學院</font></div>
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<div align="right" class="gray"><a href="mailto:tntst@pconline.com.cn">［責編:爆破手］</a></div>
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<p class="article"> <b>6.1.4 作為一種類型來使用接口</b></p>
<p class="article"> 當你定義一個新的接口的時候，從本質上講，你定義了一個新的引用數據類型。你可以在你使用其它類型的名字（比如變量聲明、方法參數等等）的地方，使用接口名字。回憶一下，我們前面在StockMonitor類中的watchStock方法中的第一個參數的數據類型，為StockWatcher：
</p>
<p class="article">public class StockMonitor {</p>
<p class="article"> public void watchStock(StockWatcher watcher,</p>
<p class="article"> String tickerSymbol, double delta) {</p>
<p class="article"> ...</p>
<p class="article"> }</p>
<p class="article">}</p>
<p class="article"> 只有執行接口的類的實例可以賦值為一個引用變量，它的類型為接口名字。因此只有執行StockWatcher接口的類的實例可以注冊以得到股票數值改變的通知。</p>
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