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

Eclipse错误

Implicit super constructor Object() is undefined for default constructor. Must define an explicit constructor 解决方案：把Java的类库加载进去，在工程上右键选择属性->Java Build Path的Libraries->Add Library选择JRE System Library->点击Next->选择Execution environment并选择版本或workspace default jre->点击Finish。