How many direct superclasses can a Java class have?

How many direct superclasses can a Java class have?

• A. One direct superclass
• B. Two direct superclasses
• C. Any number of direct superclasses
• D. No direct superclass

Answer: (A)

Java uses single inheritance for classes, so a class can have at most one direct superclass. You specify it with extends, and you can’t list two different classes as direct parents. If you don’t declare a superclass, the class implicitly extends Object, so it still has exactly one direct superclass. You can implement multiple interfaces to gain additional types, but that doesn’t add to the count of direct superclasses. So, the number of direct superclasses is one.

Java uses single inheritance for classes, so a class can have at most one direct superclass. You specify it with extends, and you can’t list two different classes as direct parents. If you don’t declare a superclass, the class implicitly extends Object, so it still has exactly one direct superclass. You can implement multiple interfaces to gain additional types, but that doesn’t add to the count of direct superclasses. So, the number of direct superclasses is one.