Can you explain what the Object class in Java is and what role it plays in inheritance and class hierarchy?

In Java, the Object class is the root class of the entire class hierarchy. This means that all classes in Java implicitly inherit from Object unless explicitly specified otherwise.

Role of the Object class:

• Defines basic methods available to all objects, such as:

  • toString() — returns a string representation of the object.
  • equals(Object obj) — compares objects for equality.
  • hashCode() — returns the hash code of the object.
  • getClass() — returns the class object.
  • clone(), finalize(), wait(), notify(), notifyAll() — methods for managing lifecycle and synchronization.

• Provides uniformity and basic functionality for all objects.

Thus, Object sets the foundation upon which the entire object-oriented model in Java is built, ensuring inheritance and polymorphism.