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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>本教程是關(guān)于什么的？</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr>   第 1 頁（共5 頁）</nobr></font></td>
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<p>Java 數(shù)據(jù)對象（Java Data Objects (JDO)）是 Sun Microsystems 的一項(xiàng)新技術(shù)。盡管 JDO 還有些不成熟（剛發(fā)布 1.0 規(guī)范），但它很有發(fā)展前景，而且它填補(bǔ)了數(shù)據(jù)庫編程領(lǐng)域的一大空白。對 Java 開發(fā)人員而言，JDO 為對象持久性提供了第一個(gè)標(biāo)準(zhǔn)化的、完全面向?qū)ο蟮姆椒āＥc此領(lǐng)域中的其它技術(shù)相比，JDO 的優(yōu)點(diǎn)是使用起來十分簡單，而且對原始的 Java 源代碼的打亂程度最小。另外，即使對于經(jīng)驗(yàn)豐富的程序員而言，JDBC 和 EJB 容器管理的持久性（EJB Container Managed Persistence (EJB CMP)）也顯得很復(fù)雜，而 JDO 在簡化用 Java 語言進(jìn)行數(shù)據(jù)庫編程的某些最復(fù)雜方面做了許多工作。本教程中，我們將使用討論、代碼樣本以及上機(jī)練習(xí)來了解有關(guān) JDO 的實(shí)際應(yīng)用。</p>
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