Overriding Methods

AP Computer Science A· difficulty 3/5

public class Shape {
    public double area() { return 0.0; }
    public String describe() { return "Area=" + area(); }
}
public class Square extends Shape {
    public double area() { return 25.0; }
}
Shape s = new Square();
System.out.println(s.describe());

What is printed?

A
$Area=0.0$
B
$Area=25.0$
check_circle
C
$Compile-time error$
D
$Area=$

Explanation

<code> describe() </code> calls <code> area() </code> . Through dynamic dispatch, <code> Square.area() </code> is invoked, returning 25.0.

Want 10 more like this — adaptive to your weak spots?

Practice 10 like thisarrow_forward Predict my AP score

Related questions