Q1. Difference between == and .equals() ?
Ans. "equals" is the member of object class which returns true if the content of objects are same whereas "==" evaluate to see if the object handlers on the left and right are pointing to the same object in memory.
Q2. Which class does not override the equals() and hashCode() methods, inheriting them directly from class Object?
Ans. java.lang.StringBuffer.
Q3. What are the methods of Object Class ?
Ans. clone() - Creates and returns a copy of this object.
equals() - Indicates whether some other object is "equal to" this one.
finalize() - Called by the garbage collector on an object when garbage collection determines that there are no more references to the object
getClass() - Returns the runtime class of an object.
hashCode() - Returns a hash code value for the object.
toString() - Returns a string representation of the object.
notify(), notifyAll(), and wait() - Play a part in synchronizing the activities of independently running threads in a program.