How do I refrence a non- static method from a static context

Question

I have this constructor with a function however when i compile my main method i non-static method area cannot be referenced from a static context. I know its a simple fix i just cant quite get there. Thanks

public class Rect{
     private double x, y, width, height;

     public Rect (double x1, double newY, double newWIDTH, double newHEIGHT){
       x = x1;
       y = newY;
       width = newWIDTH;
       height = newHEIGHT;

    }
    public double area(){
       return (double) (height * width);
}

and this main method

public class TestRect{

    public static void main(String[] args){
        double x = Double.parseDouble(args[0]);
        double y = Double.parseDouble(args[1]);
        double height = Double.parseDouble(args[2]);
        double width = Double.parseDouble(args[3]);
        Rect rect = new Rect (x, y, height, width);
        double area = Rect.area();     

    }    
}

Luiggi Mendoza · Accepted Answer · 2014-08-31 07:48:07Z

2

You would need to call the method on an instance of the class.

This code:

Rect rect = new Rect (x, y, height, width);
double area = Rect.area();

Should be:

Rect rect = new Rect (x, y, height, width);
double area = rect.area();
              ^ check here
                you use rect variable, not Rect class
                Java is Case Sensitive

answered Aug 31, 2014 at 7:48

Luiggi Mendoza

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Comments

TheLostMind · Accepted Answer · 2014-08-31 07:49:10Z

0

You have 2 options.

Make the method static.
Create an instance of the class which implements the method and call the method using the instance.

Which one to chose is purely a design decision.

answered Aug 31, 2014 at 7:49

TheLostMind

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