How do you invoke methods with java beans?

[wdh321]

I have never used java beans until a day or so ago and i am having trouble calling methods.
I have a circle class which contains the draw method for my circle and also a method to change the colour. I also have a circle component which creates the circle and also has a method calling the change colour method from circle.
I have created a .jar file using the clean and build function in netbeans.
I then create a JFrame using netbeans GUI builder and add the .jar file i created into the beans palette.
I can add the the bean to the frame and it displays my circle.
I have added a JButton that when clicked i want to call my change colour method.
I have added an actionevent to the JButton where i though a call to my CircleComponent would work like this

CircleBeanComponent.setCircleColor();

I get an error message saying that the non static method cannot be referenced from a static context.

Circle class

package my.GraphicsBean;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Ellipse2D;
import javax.swing.JComponent;

public class CircleBean extends JComponent
{
    private String color = "green";
    public CircleBean(String aColor)
    {
        color = aColor;
    }
    
    public void paintComponent(Graphics2D g)
    {
        Graphics2D g2 = (Graphics2D) g;

        Ellipse2D.Double circle = new Ellipse2D.Double(0,0,200,200);
        g2.fill(circle);
    }
    
    
    public void setFillColor(Graphics2D g)
    {
        Graphics2D g2 = (Graphics2D) g;

        if(color.equals("green"))
        {
            g2.setColor(Color.RED);
            color = "red";
        }
        if(color.equals("red"))
        {
            g2.setColor(Color.ORANGE);
            color = "orange";
        }
        if(color.equals("orange"))
        {
            g2.setColor(Color.GREEN);
            color = "green";
        }
        
        super.paintComponent(g2);
        
    }
    
}

circleComponent

package my.GraphicsBean;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.JComponent;

public class CircleBeanComponent extends JComponent
{
    CircleBean circle;
    public void paintComponent(Graphics g)
    {
        Graphics2D g2 = (Graphics2D) g;
        
        circle = new CircleBean("green");
        circle.setPreferredSize(new Dimension(200,200));
        circle.paintComponent(g2);
    }
    
    public void setCircleColor()
    {
        circle.setFillColor();
    }
}

[arieltal]

you need to create an instance of CircleBeanComponent, then call the method.

CircleBeanComponent c = new CircleBeanComponent();
c.setCircleColor();

[wdh321]

Thank you, yes that did sort that issue.
The button doesn't actually change the circle colour when pressed though. The action event i added to the button looks like this.
I had to insert the Graphics2D parts to it for it to work. So now i get no error message, but it still doesn't work how i intended.

private void changeColor(java.awt.event.ActionEvent evt) {
        CircleBeanComponent c = new CircleBeanComponent();
        Graphics2D g = null;
        Graphics2D g2 = (Graphics2D) g;
        c.setCircleColor(g);
    }