There is an error in the Chair class definition. Which statement correctly explains the error?

There is an error in the Chair class definition. Which statement correctly explains the error?

• A. Objects created using the same class must have the same properties.
• B. Each object must have its own type; each instance must have distinct properties.
• C. The class must be abstract.
• D. Chairs cannot be created as objects.

Answer: (A)

The concept being tested is how per-object state should be stored. Each chair instance should have its own attributes (like color, material, or height) that can differ from other chairs. If the class defines those attributes as static, they are shared across all instances, so every Chair would use the same values and a change in one chair would affect every chair. That situation matches the idea in the statement that objects created from the same class would have the same properties, revealing the flaw: the properties are shared instead of being kept per instance. The fix is to make these attributes non-static (instance fields) and initialize them per object, often via a constructor. The other options aren’t correct here because chairs can be created as objects, a class doesn’t have to be abstract unless you intend to prevent instantiation, and sharing the same type is normal for all instances of a class.

The concept being tested is how per-object state should be stored. Each chair instance should have its own attributes (like color, material, or height) that can differ from other chairs. If the class defines those attributes as static, they are shared across all instances, so every Chair would use the same values and a change in one chair would affect every chair. That situation matches the idea in the statement that objects created from the same class would have the same properties, revealing the flaw: the properties are shared instead of being kept per instance. The fix is to make these attributes non-static (instance fields) and initialize them per object, often via a constructor. The other options aren’t correct here because chairs can be created as objects, a class doesn’t have to be abstract unless you intend to prevent instantiation, and sharing the same type is normal for all instances of a class.