Cannot print boolean value from class!

This is my assignment
Write a class named Fan to model fans. The properties are speed, on, radius, and color. You need to provide the accessor methods for the properties, and the toString method for returning a string consisting of all the string values of all the properties in this class. Suppose the fan has three fixed speeds. Use constants 1, 2, and 3 to denote slow, medium, and fast speeds.

and my professor gave me an outline of the class and what I have to do is Write a client program(test application) to test the Fanclass. In the client program, create a Fan object.
Assign maximum speed, radius 10, color yellow, and turn it on.
Display the object by invoking its toString method.

I have gone till the end, created Fan class without any errors and also a client program to test the class but I cannot display whether the fan is ON/OFF. I simply blind coded the On class here. SO In my test class, I cannot print whether the fan is on or off, it simply shows me an error.

My Fan class is here

Code :

---

public class Fan {
public final int SLOW = 1;
public final int MEDIUM = 2;
public final int FAST = 3;
 
private int speed = SLOW;
private boolean on = false;
private double radius = 5;
private String color = "white";
 
                public Fan ( ) { }
 
                public Fan ( int newSpeed, boolean newOn, double newRadius, String newColor ) {
 
                setSpeed(newSpeed);    
                setRadius(newRadius);
                setColor(newColor);
                }
 
                public int getSpeed ( ) {
                return speed;
                }
 
                public void setSpeed ( int speed ) {
                        if (speed == SLOW) {
                            System.out.println("Speed is 1");
                         } else if (speed == MEDIUM) {
                            System.out.println("Speed is 2");
                         }
                         else if (speed == FAST) {
                             System.out.println("Speed is 3(Maximum Speed)");                   
                         } 
                         else {
                             System.out.println("Invalid Speed");
                         }
                        }
                public boolean isOn ( boolean newOn ) { 
                return newOn;
 
                }
                public void setOn ( boolean newOn ) {
                        if (on = false) {
                            System.out.println("Fan is Turned on");
 
                        } else {
                              System.out.println("Fan is turned off");  
                         }
                        }
 
                public double getRadius ( ) {                    
                return radius;
                }
 
                public void setRadius ( double newRadius ) {
                        if (newRadius <= 0) {
                            System.out.println("Radius cannot be zero or negative");
                        } else { 
                            radius = newRadius;
                         }   
                        }
 
                public String getColor ( ) {
                return color;
                }
 
                public void setColor ( String newColor ) {
                color = newColor;
                }
 
    @Override
                public String toString ( ) {
                return "Dimensions are" + radius;
                }
 
}

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My Code for testing the class

Code :

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public class TestApplication {
    public static void main (String[] args) {
 
        Fan testfan1 = new Fan(3, false, 10, "blue");
 
        System.out.println(testfan1.getSpeed() + "   " + testfan1.getColor() + " " 
                + testfan1.getRadius() + " " + [COLOR="#FF0000"]testfan1.isOn()[/COLOR]);
 
 
 
 
    }
}

---

SO as u see all the code work except testfan1.isOn, error says (req: boolean found: no args), even if I give testfan.isOn(false); no error shows up but it shows up 'false' in the output but I want it to display "Fan is turned on"

Please copy the full text of the error messages and paste it here.

Quote:

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Originally Posted by Norm

Please copy the full text of the error messages and paste it here.

---

Here is the full error message in Bold

Public method isOn cannot be applied to given types;
required: boolean
found: no arguements
reason: actual and formal arguement lists differ in length

The compiler found a definition of the isOn() method that takes a boolean as argument.
The code tried to call the method with no arguments.

Two ways to solve this:
1) add a boolean arg to the call of the method: isOn(true)
2) remove the boolean arg from the methods definition: boolean isOn() {

I'd recommend the second choice. I don't see what use passing the boolean is to the method.

Some one help please!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Did you understand what was said in post#4?

Did you try either of the suggested solutions?

Quote:

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Originally Posted by Norm

The compiler found a definition of the isOn() method that takes a boolean as argument.
The code tried to call the method with no arguments.

Two ways to solve this:
1) add a boolean arg to the call of the method: isOn(true)
2) remove the boolean arg from the methods definition: boolean isOn() {

I'd recommend the second choice. I don't see what use passing the boolean is to the method.

---

Norm my professor says to
Display the object by invoking its toString method.

How do I do that? I just displayed it using print statement but how do I do it with toString?

Quote:

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Originally Posted by adnan.alvee

SO as u see all the code work except testfan1.isOn, error says (req: boolean found: no args), even if I give testfan.isOn(false); no error shows up but it shows up 'false' in the output but I want it to display "Fan is turned on"

---

you create the public boolean isOn ( boolean newOn ) method with parameter.

So you must call this method with parameter like this..

Code :

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testfan1.isOn(false);

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And this method only print the boolean variable because you return only the boolean variable on this method like this..

Code :

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  public boolean isOn ( boolean newOn ) { 
 
                return newOn; 
                }

---

Then you want to print this statement "fan is on or off" into your ouptut. But you create this statement in setOn method like this..

Code :

---

 public void setOn ( boolean newOn ) {
                        if (on == false) {
                            System.out.println("Fan is Turned on");
 
                        } else {
                              System.out.println("Fan is turned off");  
                         }
                        }

---

so you call this setOn method in your print statement on your main method or in your isOn(arg) method
I hope you get your expected output...

then also you made another mistake in your if condition like

Code :

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 if (on = false)

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that is not use single = symbol for check the condition use == like..
[code] if (on == false) [code]

I hope this will be help to you

Quote:

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how do I do it with toString?

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The toString() method returns a String. See the API doc for the Object class.
Classes should override the toString() method and have it return a String that describes the contents to the class.
When you print a reference to a class, the toString() method is called to get the String that describes the class.