开发Java应用程序时，开发者要想有效地利用统一建模语言（UML），必须全面理解UML元素以及这些元素如何映射到Java。本文重点讨论UML类图中的元素。类图是最常用的UML图，它用于描述系统的结构化设计。其中包括类关系以及与每个类关联的属性及行为。类图能出色地表示继承与合成关系。为了将类图作为一种高效的沟通工具使用，开发者必须理解如何将类图上出现的元素转换到Java中。下面来进一步探索这一转换过程。-When developing Java applications, developers want to effectively use the Unified Modeling Language (UML), have a comprehensive understanding of UML elements and how these elements mapped to Java. This article focuses on the elements of UML class diagrams. Class diagram is the most commonly used UML diagrams, it is used to describe the structure of the system design. These include class relations and the attributes associated with each class and behavior. Class diagram that can be inherited and synthetic excellent relationship. To the class diagram as an efficient communication tool, developers must understand how the class diagram elements that appear on the conversion to Java. Below to further explore the conversion process.