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<div align="center" class="title">JAVA程序員必讀：基礎篇（4）對象和簡單數據對象</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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<p class="article"><b>對象和簡單數據對象</b></p>
<p></p>
<p class="article"><b>4.3 數字</b></p>
<p> </p>
<p class="article">其它的數據類型： </p>
<ol>
<p>
<li class="article">Boolean ：這個Boolean類在對象中包裝了原始類型Boolean。Boolean類的對象包含單一類型（double）的對象。另外，這個類提供了幾個用于將Boolean轉換為String或者將String轉換為Boolean的方法。</li>
<p></p>
<p>
<li class="article">Character ：這個Character類在對象中包裝了原始類型Character。Character類的對象包含單一類型（Character）的對象。另外，這個類提供了幾個用于將字符由小寫轉換為大寫或者由大寫轉換為小寫的方法。</li>
<p></p>
<p>
<li class="article">Void：這個Void類是一個占位符類，它保留對代表原始JAVA類void的引用。</li>
<p></p>
</ol>
<p> </p>
<p class="article">非基本算術類型Math：</p>
<p class="article"> 這個Math類包含了用于執行數值操作的方法，比如初步的指數、對數、平反根以及三角函數。 不象StrictMath類中的有些數值函數，這個Math類的所有函數不是定義為返回bit-for-bit相同的結果。這允許更好的執行，因為嚴格的再現情已經不需要了。
</p>
<p class="article"> 缺省地，許多Math函數簡單代表了在StrictMath中的等價函數。代碼發生器支持使用特殊平臺的本地庫或者微處理器指令以提供性能更高的Math函數實行。這樣高性能的執行必須符合Math的規范。</p>
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