The type java.lang.Object cannot be resolved. It is indirectly referenced from required .class files

Eclipse新建类报错：  

Implicit super constructor Object() is undefined for default constructor. Must define an explicit constructor

The type java.lang.Object cannot be resolved. It is indirectly referenced from required .class files

解决办法：

1.选中项目右击，properties->

2.libraries->add Library

3.JRE System Library 

4.WorkSpace default JRE(根据自己装的版本动态改变)