JPanel setBackground Color BLACK does nothing

Question

I have the folowing custom JPanel and I have aded it to my frame using Netbeans GUI builder but the background won t change  I can see the circle  drawing with g fillOval    What s wrong   public class Board extends JPanel       private Player player       public Board            setOpaque false           setBackground Color BLACK                public void paintComponent Graphics g             super paintComponent g           g setColor Color red           g fillOval player getxCenter    player getyCenter    player getRadius    player getRadius                public void updatePlayer Player player           this player player

User · Answer

You need to create a new Jpanel object in the Board constructor  for example   public Board        JPanel pane   new JPanel        pane setBackground Color ORANGE     sets the background to orange

User · Answer

In order to completely set the background to a given color    1  set first the background color  2  call method  Clear 0 0 this getWidth   this getHeight      width and height of the component paint area   I think it is the basic procedure to set the background    I ve had the same problem   Another usefull hint   if you want to draw BUT NOT in a specific zone  something like a mask or a  hole    call the setClip   method of the graphics with the  hole  shape  any shape  and then call the Clear   method  background should previously be set to the  hole  color    You can make more complicated clip zones by calling method clip    any times you want  AFTER calling method setClip   to have intersections of clipping shapes   I didn t find any method for unions or inversions of clip zones  only intersections  too bad     Hope it helps

User · Answer

I just tried a bare-bones implementation and it just works   public class Test        public static void main String   args                JFrame frame   new JFrame  Hello                frame setPreferredSize new Dimension 200  200                frame add new Board                 frame pack                frame setVisible true            public class Board extends JPanel        private Player player   new Player         public Board            setBackground Color BLACK              public void paintComponent Graphics g             super paintComponent g           g setColor Color red           g fillOval player getCenter   x  player getCenter   y               player getRadius    player getRadius               public class Player        private Point center   new Point 50  50        public Point getCenter             return center             private int radius   10       public int getRadius             return radius

User · Answer

If your panel is  not opaque   transparent  you wont see your background color

User · Answer

You have to call the super paintComponent    as well  to allow the Java API draw the original background  The super refers to the original JPanel code   public void paintComponent Graphics g       super paintComponent g        g setColor Color red       g fillOval player getxCenter    player getyCenter    player getRadius    player getRadius

User · Answer

setOpaque false      CHANGED to   setOpaque true

[java] JPanel setBackground(Color.BLACK) does nothing

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