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<div align="center" class="title">JAVA程序員必讀：基礎(chǔ)篇（4）對(duì)象和簡(jiǎn)單數(shù)據(jù)對(duì)象</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>對(duì)象和簡(jiǎn)單數(shù)據(jù)對(duì)象</b></p>
<p class="article"><b>4.1.1.1 聲明一個(gè)變量來引用對(duì)象</b> </p>
<p class="article"> 從前面的教程，你應(yīng)該知道了如何聲明一個(gè)變量了，你可以這樣來編寫： </p>
<p class="article">type name</p>
<p class="article">其中type是數(shù)據(jù)類型，而name是變量名。</p>
<p class="article"> 除了原始類型（比如int和boolean），JAVA平臺(tái)還直接提供了類和接口也是數(shù)據(jù)類型。這樣為了聲明一個(gè)變量來引用對(duì)象，你可以使用類或者接口的名字作為變量的類型。下面的例程使用了Point和Rectangle類作為類型來聲明變量：
</p>
<p class="article">Point origin_one = new Point(23, 94);</p>
<p class="article">Rectangle rect_one = new Rectangle(origin_one,
100, 200);</p>
<p class="article">Rectangle rect_two = new Rectangle(50, 100);</p>
<p class="article"> 聲明沒有創(chuàng)建新對(duì)象。Point origin_one代碼沒有一個(gè)新的Point對(duì)象，它只是聲明一個(gè)變量orgin_one，它將用來引用Point對(duì)象。這個(gè)引用暫時(shí)是空的直到被賦值了。一個(gè)空的引用就是一個(gè)NULL引用。</p>
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