interface是否继承自Object对象?
答案:NO，接口和类没有公共的根元素
为什么interface可以调用object中的方法？
答案:接口中隐式的实现了object中的方法.
The members of an interface are:
- Those members declared in the interface.
- Those members inherited from direct superinterfaces.
- If an interface has no direct superinterfaces, then the interface implicitly declares a public abstract member method m with signature s, return type r, and throws clause t corresponding to each public instance method m with signature s, return type r, and throws clause t declared in Object, unless a method with the same signature, same return type, and a compatible throws clause is explicitly declared by the interface.
从字节码上看是存在歧义
举例说明，写一个空类，空接口，如下
空类
public class TestC {
}
字节码如下
空接口
public interface TestI {
}
字节码如下
其中对于super_class的解析如下
For a class, the value of the super_class item either must be zero or must be a valid index into the constant_pool table. If the value of the super_class item is nonzero, the constant_pool entry at that index must be a CONSTANT_Class_info structure representing the direct superclass of the class defined by this class file. Neither the direct superclass nor any of its superclasses may have the ACC_FINAL flag set in the access_flags item of its ClassFile structure. If the value of the super_class item is zero, then this class file must represent the class Object, the only class or interface without a direct superclass.
For an interface, the value of the super_class item must always be a valid index into the constant_pool table. The constant_pool entry at that index must be a CONSTANT_Class_info structure representing the class Object.
也就是说super_class并不能说明interface继承自Object
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