Writing Constructors for Subclasses

AP Computer Science A· difficulty 4/5

public class A {
    public A() { System.out.print("A "); }
}
public class B extends A {
    public B() { this(10); System.out.print("B0 "); }
    public B(int x) { System.out.print("B1 "); }
}
new B();

What is printed?

A
$A B1 B0$
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B
$B0 A B1$
C
$B1 A B0$
D
$A B0 B1$

Explanation

B() calls B(10), which first runs implicit super() (A "), then prints B1. Control returns to B() which prints B0.

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