Writing Constructors for Subclasses

AP Computer Science A· difficulty 3/5

public class A {
    protected int x;
    public A() { x = 1; }
    public A(int v) { x = v; }
}
public class B extends A {
    public B() { super(5); }
}
// Usage:
B b = new B();
System.out.print(b.x);

What is printed?

A
$5$
check_circle
B
$1$
C
$Compile error$
D
$0$

Explanation

super(5) calls A's parameterized constructor, setting x to 5.

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