Interface Type References

In this problem, you will create a program that defines a Playable interface, implements it in Guitar and Piano classes, and uses an interface-typed array to call each instrument's play method polymorphically, displaying the results to standard output.

Learning Objective: Understand how to reference objects using interface type variables and utilize polymorphism

Overview

Create Guitar and Piano classes implementing Playable interface, and manage them in an interface-typed array.

Specifications

• Playable interface: has void play() method
• Guitar class: play() outputs "Playing guitar"
• Piano class: play() outputs "Playing piano"
• In main, create a Playable array containing Guitar and Piano
• Loop through the array and call play method on each instrument

Output Format

Playing guitar
Playing piano