先看看JDK1.5的文档介绍吧 Its external version number is 5.0 and internal version number is 1.5.0.This document covers the JavaTM 2 Platform Standard Edition 5.0 Development Kit (JDK 5.0). Its external version number is 5.0 and internal version number is 1.5.0. For information on a feature of the JDK, click on its component in the diagram below.
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