Implicit super constructor Object() is undefined for default constructor.

Eclipse错误

1.  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

->Build Path

->Configure Build Path

->Java Build Path的Libraries

->Add Library选择JRE System Library(JRE System Library) -----如果原来已有JRE System Library,可以选中Edit原来的

->点击Next->选择Execution environment并选择版本或workspace default jre->点击Finish。