Author Question: Show the output of running the class Test in the following code lines:interface A {}class C { }class ... (Read 60 times)

arivle123 · **on:** May 6, 2020

Question 1

Which of the following is incorrect?
◦ The constructors in an abstract class should be protected.
◦ You may declare a final abstract class.
◦ An abstract class contains constructors.
◦ The constructors in an abstract class are private.
◦ An interface may contain constructors.

Question 2

Show the output of running the class Test in the following code lines:

interface A {
}

class C {
}

class B extends D implements A {
}

public class Test {
public static void main(String[] args) {

B b = new B();

if (b instanceof A)

System.out.println("b is an instance of A");

if (b instanceof C)

System.out.println("b is an instance of C");

}
}

class D extends C {
}

◦ b is an instance of C.
◦ b is an instance of A followed by b is an instance of C.
◦ Nothing.
◦ b is an instance of A.

mistyjohnson · **Reply #1 on:** May 6, 2020

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