java - paintComponent method doesn't draw anything when I pass class's variable -

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my java code:

import java.awt.basicstroke; import java.awt.color; import java.awt.graphics; import java.awt.graphics2d; import java.awt.geom.ellipse2d;  import javax.swing.jpanel;  public class concentriccircles2d extends jpanel { double myx = 0; double myy = 0; int mywidth = getwidth(); int myheight = getheight();  public void paintcomponent(graphics g) {      super.paintcomponent(g);     graphics2d g2 = (graphics2d) g;     g2.setpaint(color.blue);                       g2.setstroke(new basicstroke(5.0f));      g2.draw(new ellipse2d.double(myx, myy, mywidth, myheight));  }

when use local variable inside paintcomponent method works fine. how can solve problem? (i create panel on separate class.)

mywidth , myheight values set when concentriccircles2d object instantiated. has 0 weight , height @ point.

so sentence

ellipse2d.double(myx, myy, mywidth, myheight)

is equal

ellipse2d.double(0, 0, 0, 0)

and paint no ellipse @ all.

replace sentence 

 g2.draw(new ellipse2d.double(myx, myy, mywidth, myheight));

with original

 g2.draw(new ellipse2d.double(0, 0, getwidth(), getheight()));

and ellipse centered in parent jframe drawn , dimensions change if resize parent.


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