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Interfaces will save us!

Java Collections, Level 9, Lesson 9

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How should I implement the press method so that it's behaviour remains the same?

Amigo, help... I have no idea what to do. I carefully followed the specifications, which required me to create a system for enabling an alarm. I created an alarm system (SecuritySystem) and power button (ElectricPowerSwitch), and verified that it works in the Solution class's main method.
But then I received a new requirement. It turns out they are so enthralled with the ability to turn on the alarm with a single button that determines the action to perform that now they want to also add the ability to turn on a light.
I created the LightBulb class in the image and likeness of the SecuritySystem class, but I can't figure out how to tie it to the button, since the button only works with the alarm system...

Maybe you can try creating an interface for them to share?

Requirements:

The LightBulb and SecuritySystem classes must have a common interface called Switchable.
The ElectricPowerSwitch class must not have SecuritySystem or LightBulb fields.
The ElectricPowerSwitch class must have only one field.
The logic of the ElectricPowerSwitch class and the press method must remain unchanged.

package com.codegym.task.task39.task3906; /* Interfaces will save us! */ public class Solution { public static void main(String[] args) { SecuritySystem securitySystem = new SecuritySystem(); /*ElectricPowerSwitch electricPowerSwitch = new ElectricPowerSwitch(securitySystem); electricPowerSwitch.press(); electricPowerSwitch.press();*/ } }

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AnnemiekFF

Level 41 , Breda, Netherlands

9 June 2020, 07:51

solution

Don't create a press method anywhere except in the electricPowerSwitch. You already have the turn on and turn off methods. The interface should hold abstracts for all the methods you use (3 methods), so that those implementing the interface are forced to implement the methods. Then you can just create a constructor in the EPS that takes a switchable, set it in a variable, and call the turn on and turn off methods on the switchable.

Jonas

Level 41 , Vilnius, Lithuania

9 June 2020, 17:43

Thank you