1. Everything Is an Object
1. JVM when compiling the source code, in the face of no inheritance Object object, the compiler will default to specify a default parent class Object
2. Object relations and interfaces, the interface is inherited Object? Top-level interface does not inherit the parent class will implicitly declare a set of Object and method signature exactly the same way.
2. Object method
java.lang.Object
3. Objects Methods
java.util.Object
