针对软件项目开发中维护阶段的成本和工作量难以估计的问题,提出一种基于Java程序的功能点度量方法,并介绍从目标程序中抽取数据功能点以及事务功能点的计算规则,同时以Java源代码为例说明具体的度量过程.实验结果表明,该方法是有效可行的.-For the maintenance phase of software development costs and the workload is difficult to assess problems, propose a Java program based on the function point metrics, and describes procedures to extract data from the target feature point and Services Function Point calculation rules, in both Java specify the source code as an example of the measurement process. The experimental results show that the method is feasible and effective.