Thread: Error: Main method not found! Please help!

My Assignment: Write a class named Rectangle to represent rectangles. The data fields are width, height, and color. Use double for width and height, and String for color. Suppose that all the rectangles are the same color. You need to provide the accessor methods for the properties and a findArea() method for computing the area of the rectangle.
Write a client program(test class) to test the class Rectangle. In the client program, create two Rectangle objects. Assign any width and height to the two objects. Assign the first object the color red, and the second, yellow. Display the properties of both objects and find their areas.

Some of the codes of the main class rectangle were already provided by my instructor. I did the rest but still getting the main method not found error.

public class Rectangle {
private double width = 1;
private double height = 1;
private static String color = "white";
 
                public Rectangle( ) {
 
                        }
 
                public Rectangle ( double widthParam, double heightParam, String colorParam ) { }
 
                public double getWidth ( ) { 
                return width;  
                }  
 
 
 
 
                public void setWidth ( double widthParam ) {
                                    if ((width >= 0) || (width <0))
                                            {
                                                System.out.println("Fatal error");
                                                System.exit(0);
                                            }
                                    else {
                                          this.width = width;
                                      }
                                  }
 
 
 
 
                public double getHeight ( ) { 
                            return height;
                            }
 
 
 
                public void setHeight ( double heightParam ) { 
                                if ((height >= 0) || (height <0))
                                          {
                                              System.out.println("Fatal error");
                                              System.exit(0);
                                          }
                                  else {
                                        this.height = height;
                                    }}
 
 
 
 
                public String getColor ( ) {
                return color;
                }
 
                public void setColor ( String colorParam ) { }
 
                public double findArea ( ) {
                double area = width * height;    
                return area;
                }
 
    @Override
                public String toString ( ) { 
                return ("Deafult height " + height + "Default width " + width + "Default color " + color);
                }
 
 
}      
class Test{
public static void main(String[] args){
//invoking no-arg constructor
Rectangle mr = new Rectangle();
mr.setHeight(2.0);
mr.setWidth(3.0);
double area1 = mr.findArea();
 
//invoking parameterized constructor
Rectangle mr2 = new Rectangle(2.0,3.0,"yellow");
double area2=mr.findArea();
 
//printing areas
System.out.println(area1);
System.out.println(area1);
}
 
}

Originally Posted by Norm

What is the commandline you are using to execute the program?

The formatting of the Test class does not following coding standards. The nested statements should be indented 3-4 spaces. See the Rectangle class for how to do it.

Thanks, I know. Will change that.

Got hold of the error, I was creating two classes in 1 file, separated the Test class. But I cannot dsiplay color and area. Output is 1.0 and 1.0 in the first two lines respectively.

Please don't cross-post the same question in multiple forum without notifying all forums that you post in that you're doing this. This is not fair to us or the volunteers in the other fora, and can get you placed on do-not-help lists if it continues.

Originally Posted by Norm

Is the program executing now?

Copy and paste here the full contents of the program's output.

If the output is wrong, please explain what it should be and provide some example of correct output.

Okay, this is my rectangle.java file code,

public class Rectangle {
private double width = 1;
private double height = 1;
private static String color = "white";
 
                public Rectangle( ) {
 
                        }
 
                public Rectangle ( double widthParam, double heightParam, String colorParam ) { }
 
                public double getWidth ( ) { 
                return width;  
                }  
 
 
 
 
                public void setWidth ( double widthParam ) {
                                    if (width <= 0) 
                                            {
                                                System.out.println("Fatal error");
                                                System.exit(0);
                                            }
                                    else {
                                          this.width = width;
                                      }
                                  }
 
 
 
 
                public double getHeight ( ) { 
                            return height;
                            }
 
 
 
                public void setHeight ( double heightParam ) { 
                                if (height <= 0) 
                                          {
                                              System.out.println("Fatal error");
                                              System.exit(0);
                                          }
                                  else {
                                        this.height = height;
                                    }}
 
 
 
 
                public String getColor ( ) {
                return color;
                }
 
                public void setColor ( String colorParam ) { }
 
                public double findArea ( ) {
                double area = width * height;    
                return area;
                }
                public String toString ( ) { 
                return ("Deafult height " + height + "Default width " + width + "Default color " + color);
                }
 
 
 
 
}

and this is the Test class,

public class TestRectangle {
 
public static void main(String[] args){
            //invoking no-arg constructor
            Rectangle mr = new Rectangle();
            mr.setHeight(2.0);
            mr.setWidth(3.0);
            mr.setColor("Green");
            double area1 = mr.findArea();
 
            //invoking parameterized constructor
            Rectangle mr2 = new Rectangle(2.0,3.0,"yellow");
            double area2=mr.findArea();
 
            //printing areas
            System.out.println(area1);
            System.out.println(area2);
            }
 
            }

There are no errors but what I want to output is area1 and area2 as you see in the Test class that has different values and also a way to set a different color for mr1 and mr2 in Test class

But what I am getting is 1.0(1st line) and 1.0(2nd line)

Thanks!

Originally Posted by Norm

What values does the findArea() method compute and return? Look at that method to see what it does.

Tried this code System.out.println(findArea); error comes up saying "Cannot find symbol"

Got it, its the same value 1.0. Tried with different initial values in height and width, findarea is good but my test class is not giving me the values I assigned in that class; all what I am getting is the default findarea value!

Originally Posted by Norm

Where does the test class pass values to the Rectangle class? What does the Rectangle class do with the values it receives?

Sorry I am not getting you here. Did you find an error in my code? I have no idea what I should change in my code!