以前在window的eclipse下时，编写代码之后，鼠标停留之上会显示相应的解释文档，这阶段才发现现在用的ubuntu下没有自动解释，不知道是SDK的问题？还是其他
显示信息：This element has no attached sources and the Javadoc could not found in the attached Javadoc.
显示信息：This element has no attached sources and the Javadoc could not found in the attached Javadoc.
共同学习。