Polygon compiles; it remains abstract because area() is unimplemented An abstract subclass need not implement abstract methods; concrete descendants will.

Polygon compiles; it remains abstract because area() is unimplemented

Compile-time error: Polygon cannot extend Shape

Creating Superclasses and Subclasses

AP Computer Science A· difficulty 3/5

public abstract class Shape {
    public abstract double area();
}
public abstract class Polygon extends Shape {
    public int sides() { return 0; }
}

What is true?

A
$Polygon must implement area()$
B
$Polygon compiles; it remains abstract because area() is unimplemented$
check_circle
C
$Polygon cannot be abstract$
D
$Compile-time error: Polygon cannot extend Shape$

Explanation

An abstract subclass need not implement abstract methods; concrete descendants will.

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