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<div align="center" class="title">JAVA程序員必讀：基礎(chǔ)篇（3）語言基礎(chǔ)</div>
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<div align="center"><font color="#666666">編譯：ZSC/太平洋網(wǎng)絡(luò)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(chǔ)</b> </p>
<p></p>
<p class="article"><b>3.4 控制流程語句</b></p>
<p class="article"> 程序使用控制流程語句來有條件地執(zhí)行語句、循環(huán)語句或者跳轉(zhuǎn)到程序中的其它部分執(zhí)行語句。這節(jié)教程介紹怎樣利用比如if-else和while來控制你的程序流程。</p>
<p class="article"> 當你編寫程序的時候，你在文件中鍵如語句。如果你沒有使用控制流程語句，編譯器將以從左到右、從上到下的順序執(zhí)行這些語句。你可以在你的程序中使用控制流程語句來有條件地執(zhí)行語句、來重復執(zhí)行語句塊地代碼、改變程序執(zhí)行的順序等等。比如，在下面的代碼段中，if語句就有條件執(zhí)行了括號中的System.out.println，這里的條件是Character.isUpperCase(aChar)的返回值：
</p>
<p class="article">char c;</p>
<p class="article">...</p>
<p class="article">if (Character.isUpperCase(aChar)) {</p>
<p class="article"> System.out.println("The character " + aChar +
" is upper case.");</p>
<p class="article">}</p>
<p class="article">JAVA編程語言提供了幾個控制流程語句，在下表給出了：</p>
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<p class="article">語句
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<p class="article">關(guān)鍵字
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<p class="article">循環(huán)語句
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<p class="article">while, do-while , for
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<p class="article">判斷語句
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<p class="article">if-else, switch-case
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<p class="article">異常處理
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<p class="article">try-catch-finally, throw
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<p class="article">分支語句
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<p class="article">break, continue, label:, return
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