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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 class="article"><b>3.4.3 if-else語句</b></p>
<p class="article"> 如果if部分為false，則執行else塊。另外一種else語句的格式是else if，它根據執行另外的表達式執行語句。一個if語句可以跟著任意個else
if語句，但只能有一個else語句。下面是一個例程IfElseDemo，它根據測試分數的數值來指定一個等級：90％或者更高為A，80％或者更高為B等等。
</p>
<p class="article">public class IfElseDemo {</p>
<p class="article"> public static void main(String[] args) {</p>
<p class="article"> int testscore = 76;</p>
<p class="article"> char grade;</p>
<p class="article"> if (testscore >= 90) {</p>
<p class="article"> grade = 'A';</p>
<p class="article"> } else if (testscore >= 80) {</p>
<p class="article"> grade = 'B';</p>
<p class="article"> } else if (testscore >= 70) {</p>
<p class="article"> grade = 'C';</p>
<p class="article"> } else if (testscore >= 60) {</p>
<p class="article"> grade = 'D';</p>
<p class="article"> } else {</p>
<p class="article"> grade = 'F';</p>
<p class="article"> }</p>
<p class="article"> System.out.println("Grade = " + grade);</p>
<p class="article"> }</p>
<p class="article">}</p>
<p class="article"> 程序的輸出為： </p>
<p class="article">Grade = C</p>
<p class="article"></p>
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