Which fields in class A can be inherited in class B in the code below if A and B are in the same package? <pre> class A { protected int a; public int b; private int c; int d; } class B extends A {} </pre>

The variable c cannot be inherited as it is private, which means it's only accessible within class A.

Quiz 2 : Access Modifiers » Week 1 » Inheritance And Data Structures In Java

Q: Can a subclass inherit a private member of its parent class?

You can’t inherit the private members of a parent class. Private members can't be accessed outside of the class.

Q: We can’t declare private variables in a child class because its parent class should have access to every variable in the child class.

There is no need to let a parent class have control of a child class. Every class can have its own private variables, as well as other protected and/or public variables.

Q: Which type of variable or method can only be accessed from within the current package?

The default (no access modifier) means you can access it from classes in the same package.

Q: Which of the following must be used for the main() method?

The main() method must be specified public.

Q: What is the output for the following code? <pre> class A { private int number; public String name; private void display() { System.out.print("One"); } public String printname(String name) { this.name = name; System.out.print(name); return name; } } public class B { public static void main(String[] args) { A a = new A(); a.display(); a.printname("Aa"); } } </pre>

display() is private method in class A. This means you will get a compile error if you try and call this method from another class.

Q: Which type of variable or method can only be accessed from within the same package or sub classes in a different package?

protected variables and methods can be accessed within the same package or sub classes in a different package.

Q: What is the output of the following code? <pre> class A { protected void display() { System.out.print("One"); } } public class B extends A { void display() { System.out.print("Two"); } public static void main(String[] args) { B b = new B(); b.display(); } } </pre>

The access modifier for an overriding method in a subclass cannot be more restrictive (private) than the access modifier for the overridden method in the superclass. In this example, the display() method in class B has a default access modifier, while the overridden display() method in class A has a protected access modifier. The default access modifier is more restrictive (private) than the protected access modifier, so the program will generate a compile error.