In a package named "lecture10“, implement the following. Lecture Question • class Battery with • A constructor that takes a variable named "charge" of type Int. abstract class Electronic with • A constructor that takes no parameters. • A state variable named "battery" of type Battery. • A method named "use" that takes no parameters and returns Unit (this can be abstract). • A method named "replaceBattery" that takes a Battery as a parameter and returns a Battery. • This method swaps the input Battery with the Battery currently stored in this Electronic's state variable. • The returned Battery is the one that was in the state variable when the method is called. class Flashlight that extends Electronic. • A constructor that takes no parameters • When a new Flashlight is created, assign the inherited state variable named "battery" to a new Battery with 5 charge (ie. Batteries included). Override the "use" method to reduce the charge of the battery in the state variable by 1 if its charge is 1 or greater. class BoomBox that extends Electronic. • A constructor that takes a variable of type Battery and assigns it to the inherited state variable named "battery". • Your BoomBox constructor parameter should have a different name than the state variable. • Override the "use" method to reduce the charge of the battery in the state variable by 3 if its charge is 3 or greater.
In a package named "lecture10“, implement the following. Lecture Question • class Battery with • A constructor that takes a variable named "charge" of type Int. abstract class Electronic with • A constructor that takes no parameters. • A state variable named "battery" of type Battery. • A method named "use" that takes no parameters and returns Unit (this can be abstract). • A method named "replaceBattery" that takes a Battery as a parameter and returns a Battery. • This method swaps the input Battery with the Battery currently stored in this Electronic's state variable. • The returned Battery is the one that was in the state variable when the method is called. class Flashlight that extends Electronic. • A constructor that takes no parameters • When a new Flashlight is created, assign the inherited state variable named "battery" to a new Battery with 5 charge (ie. Batteries included). Override the "use" method to reduce the charge of the battery in the state variable by 1 if its charge is 1 or greater. class BoomBox that extends Electronic. • A constructor that takes a variable of type Battery and assigns it to the inherited state variable named "battery". • Your BoomBox constructor parameter should have a different name than the state variable. • Override the "use" method to reduce the charge of the battery in the state variable by 3 if its charge is 3 or greater.
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Scala code.
Transcribed Image Text:In a package named "lecture10“, implement the following.
Lecture Question
class Battery with
• A constructor that takes a variable named "charge" of type Int.
• abstract class Electronic with
• A constructor that takes no parameters.
• A state variable named "battery" of type Battery.
A method named "use" that takes no parameters and returns Unit (this can be abstract).
• A method named "replaceBattery" that takes a Battery as a parameter and returns a Battery.
• This method swaps the input Battery with the Battery currently stored in this Electronic's state variable.
• The returned Battery is the one that was in the state variable when the method is called.
• class Flashlight that extends Electronic.
• A constructor that takes no parameters
When a new Flashlight is created, assign the inherited state variable named "battery" to a new Battery with 5 charge (ie.
Batteries included).
Override the "use" method to reduce the charge of the battery in the state variable by 1 if its charge is 1 or greater.
class BoomBox that extends Electronic.
• A constructor that takes a variable of type Battery and assigns it to the inhherited state variable named "battery“.
Your BoomBox constructor parameter should have a different name than the state variable.
Override the "use" method to reduce the charge of the battery in the state variable by 3 if its charge is 3 or greater.
Transcribed Image Text:Lecture Question
Your Flashlight and BoomBox classes must inherit Electronic. This will be
checked by storing them in variables of type Electronic.
new Flashlight()
new BoomBox (new Battery(10))
val flashlight1: Electronic =
val boomBox1: Electronic
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