What will the toString() method return if not overridden?

• A. The default constructor
• B. The object reference address
• C. The string value of the object
• D. Null

Answer: (B)

When the toString() method is not overridden in a class, it inherits the default implementation from the Object class in Java. The default implementation of toString() returns a string that consists of the class name followed by the "@" character and the object's hash code in hexadecimal form. This means it effectively represents the memory address (or location) of the object in the heap, which can sometimes be perceived as the object reference address.

In most cases, this output looks something like ClassName@hashCode, where ClassName is the name of the class of the object, and hashCode is the hash code generated by the default implementation which serves as a unique identifier for that specific object instance.

Options that suggest other outcomes like the default constructor, a string value of the object, or null do not accurately reflect the behavior of the unmodified toString() method. Instead, it's essential to understand that without custom implementation, the method provides this specific string format that reflects an internal representation of the object rather than its content or state.