Question

Suppose there is a class AirConditioner. The class supports the following behaviors: turning the air conditioner on and off. The following methods are provided for these behaviors: turn_on and turn_off. Both methods accept no arguments and return no value.
"There is a reference variable my_ac to an object of this class, which has already been created. There is also a variable status, which has already been initialized which refers to a bool. Invoke a method of this object using the reference variable, asking the object to tell whether the air conditioner is on or off, and store the result in status."

Answer 1

Answer:

Firstly, create an AirConditioner class inside a file named as AirConditioner.java. This is important to make sure the class name match with the file name.

1. public class AirConditioner {
3.    private boolean status = false;
5.    public void turn_on()
6.    {
7.        this.status = true;
8.    }
10.    public void turn_off()
11.    {
12.        this.status = false;
13.    }
15.    public boolean getStatus()
16.    {
17.        return this.status;
18.    }
19. }

Next, create another file named as Main.java. This is where we are going to include a Main method to create an object of AirConditioner class and get the air conditioner status. The codes are as follows:

1. public class Main {
3.    public static void main(String[] args) {
5.        AirConditioner my_ac= new AirConditioner();
6.        boolean status;
8.        my_ac.turn_on();
9.        status = my_ac.getStatus();
11.        System.out.println(status);
12.    }
13. }

Explanation:

The codes presented above are written based on the question requirements.

AirConditioner.java

Line 1:

• Create an AirConditioner  class

Line 3:

• A property status is defined. This is important to track the status of an AirConditioner object.

Line 5 -8 and Line 10 -13:

• Create two required methods turn_on() and turn_off(). Both of them accept no arguments and return no value.

• The only job done by this two methods is to change the status property to either true (on) or false (off).

Line 15 - 18:

• The getStatus() method is to return the current status of the AirConditioner object to the Main method in main.java.

Main.java

Line 5-6:

• Within the Main method, create an object of AirConditioner and assign it to a reference variable, my_ac

• Create the status variable as a boolean variable.

Line 8:

• Use reference variable my_ac to invoke turn_on() method to change the status of the AirConditioner object to true
• Use the same reference variable my_ac to invoke getStatus() method to get the current satus of the AirConditioner object and assign it to the status variable.

Line 11:

• Print the status of AirConditioner Object in terminal