Chapter 11: Problem 7

How can a subclass method call an overridden superclass method?

Short Answer

Expert verified

Answer: In order to call the overridden superclass method from the subclass, we can use the 'super' keyword followed by the method name within the subclass method. For example, if we have a superclass 'Animal' with a method 'makeSound()' and a subclass 'Dog' that overrides the 'makeSound()' method, we can add the 'super.makeSound()' call in the 'makeSound()' method of the 'Dog' subclass. This will allow the subclass to call the overridden superclass method.

Step by step solution

Create a superclass with a method

First, we need to create a superclass with a method that will later be overridden. For this example, let's create a superclass called 'Animal' and a method called 'makeSound()' that simply prints a message. ```java public class Animal { public void makeSound() { System.out.println("The animal makes a sound"); } } ```

Create a subclass and override the superclass method

Now let's create a subclass called 'Dog' that extends the 'Animal' superclass. We will override the 'makeSound()' method in this subclass and print a different message. ```java public class Dog extends Animal { @Override public void makeSound() { System.out.println("The dog barks"); } } ```

Call the overridden superclass method from the subclass

In order to call the overridden superclass method from the subclass, we can use the 'super' keyword followed by the method name within the subclass method. In this case, we will add the 'super.makeSound()' call in the 'makeSound()' method of the 'Dog' subclass. ```java public class Dog extends Animal { @Override public void makeSound() { super.makeSound(); // calling the superclass method System.out.println("The dog barks"); } } ```

Test the subclass method

Finally, we can create a 'main' method in a separate class or within one of the existing classes to test if the subclass method is correctly calling the overridden superclass method. ```java public class Main { public static void main(String[] args) { Dog dog = new Dog(); dog.makeSound(); // this should call the overridden superclass method and print both messages } } ``` When the 'makeSound()' method of the 'Dog' subclass is called in the 'main' method, the output will be: ``` The animal makes a sound The dog barks ```

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How can a subclass method call an overridden superclass method?

Short Answer

Step by step solution

Create a superclass with a method

Create a subclass and override the superclass method

Call the overridden superclass method from the subclass

Test the subclass method

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