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<div align="center" class="title">JAVA程序員必讀：基礎篇（3）語言基礎</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>語言基礎</b> </p>
<p> </p>
<p> </p>
<p> </p>
<p> </p>
<p> <b> </b></p>
<p></p>
<p><b><span class="article">3.3 表達式、語句和塊</span></b></p>
<p class="article"> 這一節教程討論怎樣將運算符和變量集中到表達式中去。表達式是代碼的構建塊。你同樣還可以學到怎樣構造語句和語句塊。
</p>
<p class="article"> 變量和運算符是程序的基本構造塊。你可以集中變量和運算符來組成表達式（表達式是執行計算并返回數值的代碼段）。通過使用大括號{和}你可以創建代碼塊。
</p>
<p></p>
<p class="article"><b>3.3.1表達式</b></p>
<p class="article"> 表達式執行程序的工作。跟其它事情一樣，表達式用于計算和為變量賦值并且幫助控制程序的執行流程。表達式任務有兩重：利用表達式的元素來執行計算；返回計算結果的數值。
</p>
<p class="article"> 就象前面的章節討論的，運算符要返回一個數值，因此運算符的使用就是一個表達式。如下的程序：
</p>
<p class="article">…</p>
<p class="article">char aChar = 'S';</p>
<p class="article">boolean aBoolean = true;</p>
<p class="article">// 顯示</p>
<p class="article">System.out.println("The largest byte value is "
+ largestByte);</p>
<p class="article">...</p>
<p class="article">if (Character.isUpperCase(aChar)) {</p>
<p class="article"> ...</p>
<p class="article">}</p>
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