Problems with setBackground()

What's up guys!

It is my very first thread in here. I am a beginner in Java Programming.
The program should display a FullScreen Window with a setBackground Color
and some Message.

at Line 13 in orange.java: I set the Background to PINK.
However the screen remains BLACK. The Foreground is displayed correctly.
Please help me to understand the Problem, why I can not set the Background color.

Two files are attached.

I think the problem is that is your class orange, in the paint method, you don't call super.paint( g ); . If you place this statement on top of your paint method, the background will become pink.

Hannes

Quote:

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It is my very first thread in here.

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To increase your chances of getting help you should create a Short, Self Contained, Compilable and Executable, Example Program (SSCCE), that demonstrates the incorrect behaviour.

Quote:

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Originally Posted by hannes

I think the problem is that is your class orange, in the paint method, you don't call super.paint( g );

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I added super.paint( g ) as you said. Now the Background is always Gray, whatever I specify in Line 13 for setBackground(Color.***).:confused:

have a look at Painting in AWT and Swing. There you can find a explanation of how the painting in awt and swing works, and what methods you should override.

Hannes

I got my Problem solved by a user from another forum!
One should use ContentPane from JPanel.:) Still have to study that stuff carefully.

Code:

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public void run(DisplayMode dm){
        getContentPane().setBackground(Color.BLUE);
        setForeground(Color.RED);
      ...
    }

    public void paint(Graphics g){
        super.paint(g); // Der super-Aufruf sollte bei überschriebenen paint*-Methoden immer die erste Zeile sein!
            if(g instanceof Graphics2D){
...
    }

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Quote:

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Originally Posted by Oleg

I got my Problem solved by a user from another forum!
One should use ContentPane from JPanel.:) Still have to study that stuff carefully.

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A JPanel doesn't have a content pane. What you should do is override the paintComponent( ... ) method, not the paint( ... ) method. As the first statement your method should call its overriden implementation to draw the entire background.

kind regards,

Jos