Is the parent class, java in the top-level parent of all classes, all classes inherit the default object class.
This time may be another problem
class c{ } class B extends c{ }
Java is between class and class single inheritance, and all classes inherit Object default, then the above B is also inherited Object inherit C, that does not meet the single inheritance mechanism between the java classes and class?
A: java support multi-level inheritance, if you do not show as inheritance C then it defaults Object inheritance, as if Show Inherited parent class B then C is also the default inheritance Object B thus constitutes a multi-level inheritance Object.