hello,can you help me solve the problem

hello，I have a problem with my code,my develop tool is Eclipse, i use it programmed a simple project,however it can not run sucessfully.
The error messages are these.

you can config your build path such as JRE system library,,if that can not be useful,you can create a new project and copy the code to your the new project .

你的index文件没有在com包下面