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<div align="center" class="title">JAVA程序員必讀：基礎(chǔ)篇(6)---接口和包</div>
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<div align="center"><font color="#666666">編譯：ZSC/太平洋網(wǎng)絡(luò)學(xué)院</font></div>
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<p class="article"> <b><span class="article">6.1.2 定義接口</span></b></p>
<p class="article"> 下面講講界面的聲明：</p>
<p class="article"> 如圖30給出了接口聲明的所有可能組件： </p>
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<p class="article"><img src="/pcedu/empolder/gj/java/images/10717/Image67.gif" width=447 height=124></p>
<p class="article">（圖30）</p>
<p class="article"> 在接口定義中需要兩個(gè)元素：interface關(guān)鍵字和接口的名字。Public指示了接口可以在任何的包中任何的類(lèi)中使用。如果你沒(méi)有指定接口為public，那么接口就只能在定義接口的包中類(lèi)使用了。</p>
<p class="article"> 接口定義可以有另外一個(gè)組件：superinterfaces系列。一個(gè)接口可以擴(kuò)展另外的接口，這跟類(lèi)可以擴(kuò)展一樣。但是，類(lèi)只能擴(kuò)展一個(gè)另外的類(lèi)，而接口可以擴(kuò)展任意個(gè)接口。Superinterfaces系列椒以逗號(hào)分隔的所有接口，這些接口可以由新的接口擴(kuò)展。
</p>
<p class="article"> 這時(shí)候，你也許會(huì)問(wèn)：那接口實(shí)體怎么說(shuō)呢？別急，下面就會(huì)解釋了：</p>
<p class="article"> 接口實(shí)體為所有包含在接口中的方法包含了方法聲明。在接口中的方法聲明可以緊跟著一個(gè)逗號(hào)，因?yàn)榻涌诓粸槎x在它上面的方法提供執(zhí)行。所有定義在接口中的方法可以隱含地為public和abstact。</p>
<p class="article"> 接口可以包含常量s聲明以及方法聲明。所有定義在接口中的常量可以是public、 static和final。定義在接口中的成員聲明不允許使用一些聲明修飾語(yǔ)，比如你不能在接口中的成員聲明中使用transient、volatile或者synchronized。同樣你不能在聲明接口的成員的時(shí)候使用private和protected修飾語(yǔ)。</p>
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