java - JComponent subclass not appearing -


okay. writing ball class , ball not displayed. tried adding other components container , displayed, think safe assume problem ball. class code:

import java.awt.color; import java.awt.graphics;  import javax.swing.jcomponent;   public class ball extends jcomponent {  public ball() {     ballx  = (window.window_width - ball_diameter) / 2;     bally  = (window.window_height - ball_diameter) / 2; }  @override public void paintcomponent(graphics g) {     super.paintcomponent(g);     g.drawrect(5, 5, 50, 50);     g.setcolor(color.green);     g.filloval(ballx, bally, ball_diameter, ball_diameter);     g.dispose();  } public void setx(int x) {     ballx = x; } public void sety(int y) {     bally = y; }  private int ballx; private int bally; public static final int ball_diameter = 30; }

the first rect used testing. doesn't appear neither....

make sure component has preferred size larger (0, 0):

@override public dimension getpreferredsize() {     return new dimension(500, 500); }

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