eclipse java 配置

1、eclipse菜单 - Window - Preferences- Java - Installed JREs 

2、eclipse菜单 - Window - Preferences- Java - Installed JREs - execution environments - java se 1.8 

3、项目右键 - properties - java build paths - libraries - jre system libraries  选中  - remove - add libraries  - 选中 jre system libraries 

4、项目邮件 - properties - java complier -