Question

JAVA, this is practice to better understand java.
//Please note throughout if possible looking to better understand the process.

Write the following class: TV.
Define Class TV
Write the class header

Class Variables
Class TV is to have the following instance variables:
1.channel of type int
2. volumeLevel of type int
3. isOn of type boolean

Each data member is to have an access specifier of private.

Constructor
Class TV is to have a single, no-arg constructor that initializes the instance variables to zero or false.

Get and Get Methods
Class TV has neither get( ) nor set( ) methods

Auxiliary Methods
In place of standard get/set methods, class TV will have the following public auxiliary methods:
1. a void method turnOn( ), that takes no parameters and sets isOn to true;
2. a void method turnoff( ), that takes no parameters and sets isOn to false;
3. a void method setChannel( ) that takes an integer parameter named newChannel and assigns the instance variable channel to the parameter value;
4. a void method setVolume( ) that takes an integer parameter named newVolumeLevel and assigns the instance variable volumeLevel to the parameter value;
5. a void method channelUp( ) that takes no parameters and increments the instance variable channel by one;
6. a void method channelDown( ) that takes no parameters and decrements the instance variable channel by one;
7. a void method volumeUp( ) that takes no parameters and increments the instance variable volume by one;
8. a void method volumeDown( ) that takes no parameters and decrements the instance variable volume by one.

Method Overrides
Class TV is to override the Object equals( ) method to do the following:
1. test to see if the parameter represents an object;
2. test to see if the parameter object is of the same class type as the calling object;
3. determine if the calling object and the parameter object store identical data values for the corresponding data members.

Class TV is to override the Object toString( ) method that does the following:
1. displays the following information in the format presented:
Current Channel: display channel data
Volume Level: display volumeLevel data
Power: display isOn data

Answer 1

TV.java

/*
* Class Name: TV
* Description: class to define a TV
* Author: Your name
*
*/
public class TV {
   //data members
   private int channel;
   private int volumeLevel;
   private boolean isOn;
  
   //constructor
   public TV() {
       channel = 0;
       volumeLevel = 0;
       isOn = false;
   }
  
   //methods to turn on and off
   public void turnOn() {
       isOn = true;
   }
  
   public void turnOff() {
       isOn = false;
   }
  
   //methods to set channel and volume
   public void setChannel(int newChannel) {
       channel = newChannel;
   }
  
   public void setVolume(int newVolumeLevel) {
       volumeLevel = newVolumeLevel;
   }
  
   //methods to turn up and down the channel and volume
   public void channelUp() {
       channel++;
   }
  
   public void channelDown() {
       channel--;
   }
  
   public void volumeUp() {
       volumeLevel++;
   }
  
   public void volumeDown() {
       volumeLevel--;
   }
  
   //overriding equals method
   @Override
   public boolean equals(Object arg0) {
       if(arg0 instanceof Object && arg0 instanceof TV && ((TV)arg0).channel == this.channel && ((TV)arg0).volumeLevel == this.volumeLevel && ((TV)arg0).isOn == this.isOn) {
           return true;
       }
       return false;
   }
  
   //overriding toString method
   @Override
   public String toString() {
       String outString = "";
       outString += "\nCurrent Channel: " + this.channel;
       outString += "\nVolume Level: " + this.volumeLevel;
       outString += "\nPower: " + this.isOn;
       return outString;
   }
}

Main.java

public class Main {

   public static void main(String[] args) {
       //initializing two TVs
       TV tv1 = new TV();
       TV tv2 = new TV();
       //printing
       System.out.println("\nTV1 : " + tv1.toString());
       System.out.println("\nTV2 : " + tv2.toString());
       //calling the method
       tv1.turnOn();
       tv1.setChannel(5);
       tv1.channelUp();
       tv1.setVolume(50);
       tv1.volumeDown();
       //printing data
       System.out.println("\nTV1 : " + tv1.toString());
       tv2.turnOn();
       tv2.setChannel(5);
       tv2.channelUp();
       tv2.setVolume(50);
       tv2.volumeDown();
       System.out.println("\nTV2 : " + tv2.toString());
       //checking if two TVs are equal
       System.out.println("\nTV1 equals TV2?: " + tv1.equals(tv2));
       //turning off the 2nd TV
       tv2.turnOff();
       System.out.println("\nTV2 : " + tv2.toString());
       //checking if two TVs are equal now
       System.out.println("\nTV1 equals TV2?: " + tv1.equals(tv2));

   }

}

Sample Output:

TV1 :
Current Channel: 0
Volume Level: 0
Power: false

TV2 :
Current Channel: 0
Volume Level: 0
Power: false

TV1 :
Current Channel: 6
Volume Level: 49
Power: true

TV2 :
Current Channel: 6
Volume Level: 49
Power: true

TV1 equals TV2?: true

TV2 :
Current Channel: 6
Volume Level: 49
Power: false

TV1 equals TV2?: false