Thread: 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

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;
                }
 
}

My Code for testing the class

 
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"

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

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

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?