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 -

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