Object class:-
Class Object is the root of the class hierarchy. Every class
has Object as a super class. All objects, including arrays,
implement the methods of this class. 

1)protected  Object 	clone()
          Creates and returns a copy of this object.
2) boolean equals(Object obj)
          Indicates whether some other object is "equal to"
this one.
3)protected  void finalize()
          Called by the garbage collector on an object when
garbage collection determines that there are no more
references to the object.
4)Class<? extends Object> getClass()
          Returns the runtime class of an object.
5) int 	hashCode()
          Returns a hash code value for the object.
6)void 	notify()
          Wakes up a single thread that is waiting on this
object's monitor.
7) void notifyAll()
          Wakes up all threads that are waiting on this
object's monitor.
8) String toString()
          Returns a string representation of the object.
9)void wait()
          Causes current thread to wait until another thread
invokes the notify() method or the notifyAll() method for
this object.
10)void wait(long timeout)
          Causes current thread to wait until either another
thread invokes the notify() method or the notifyAll() method
for this object, or a specified amount of time has elapsed.
11) void wait(long timeout, int nanos)
          Causes current thread to wait until another thread
invokes the notify() method or the notifyAll() method for
this object, or some other thread interrupts the current
thread, or a certain amount of real time has elapsed.

In Java,Object Class is a superclass for every class.the 
above listed methods r there in object class.

Object class is the super most class inside the hierarchy of
classes.

1).wait()
2).notify()
3).notifyAll()
4).instanceOf()