How do I get a white background with black lines

Question

How do I get a white background with black lines and characters on my screen. To run the program, copy it out and delete the ` and it should go. If it does not compile on your machine, I would like to know. There is a test on about line 34 for changing the colors.
`//Simple program to test Graphics2D.setBackground(white) obtained from BufferedImage.getGraphics()
`import java.awt.Frame; //Object>awt.Component>Container>Window>Frame
`import java.awt.Insets; //Object>awt.Insets
`import java.awt.image.BufferedImage; //Object>awt.Image>awt.image.BufferedImage
`import java.awt.Graphics; //Object>awt.Graphics
`import java.awt.Graphics2D; //Object>awt.Graphics>Graphics2D
`import java.awt.Color;
`import java.awt.BasicStroke;
`public class TstBgCol { //frame & BufferedImage in pixels & BasicStroke in points ????????????
` TstBgCol tstBgCol;
` public static void main(String[] args) {
` TstBgCol tstBgCol=new TstBgCol(); tstBgCol.tstBgCol=tstBgCol;
` tstBgCol.main2(); tstBgCol.byteBinary();
` }
` Graphics fgcontext;
` Frame fram; Insets insets; //borders of the Frame, Container.getInsets
` int bIWid=1272,bIHgt=876; //set for 1280x1024 screen on windows XP & matches paper ratio 10.6x7.3
` int unusedPixHgt=84;
` void main2() {
` fram=new Frame();
` fram.addWindowListener(new java.awt.event.WindowAdapter() { //anonymous inner class
` public void windowClosing(java.awt.event.WindowEvent e) { System.exit(0); }
` });
` fram.setVisible(true);
` insets=fram.getInsets(); //(Container)getInsets() works after displayable
` System.out.println("Insets l,t,r,b:"+insets.left+","+insets.top+","+insets.right+","+insets.bottom);
` fram.setSize(insets.left+bIWid+insets.right,insets.top+bIHgt+unusedPixHgt+insets.bottom);
` fgcontext=fram.getGraphics(); //creates Graphics context for this component
` }
` void byteBinary() {
` BufferedImage buIm=new BufferedImage(bIWid,bIHgt,BufferedImage.TYPE_BYTE_BINARY); //can be resized
` Graphics2D bIG2=buIm.createGraphics(); //returns Graphics2D context
` //change to if(true) to use either of the following two lines
` if(false) bIG2.setBackground(Color.white); //does not change the background color to white
` if(false) bIG2.setColor(Color.black); //does change the foreground color to black
` edgeLinesAndX(buIm,bIG2);
` fgcontext.drawImage(buIm,insets.left,insets.top,fram);
` }
` private void edgeLinesAndX(BufferedImage bI,Graphics2D bIG2) { //really on the edge
`      BasicStroke strk=new BasicStroke(10f); bIG2.setStroke(strk);
` int x0,y0,xmx,ymx;
` x0=bI.getMinX(); y0=bI.getMinY(); xmx=bI.getWidth()-1; ymx=bI.getHeight()-1;
` bIG2.drawLine(x0+xmx,y0,x0,y0+ymx); //lo-left to up-right
` bIG2.drawLine(x0,y0,x0+xmx,y0+ymx); //up-left to lo-right
` bIG2.drawLine(x0,y0,x0+xmx,y0); //up-left to up-right
` bIG2.drawLine(x0,y0,x0,y0+ymx); //up-left to lo-left
` bIG2.drawLine(x0,y0+ymx,x0+xmx,y0+ymx); //lo-left to lo-right
` bIG2.drawLine(x0+xmx,y0,x0+xmx,y0+ymx); //up-right to lo-right
` bIG2.drawString("("+x0+","+y0+") wid="+(xmx+1)+" hgt="+(ymx+1),(xmx+1)/5,(ymx+1)/5);
` }
`} //the result on my screen is a black background, why?????

Answer 1

How do I get a white background with black lines and characters on
my screen.Contrary to what you might think, the linebIG2.setBackground(Color.white);does not give the buffered image a white background. The API docs
http://java.sun.com/j2se/1.5.0/docs/api/java/awt/Graphics2D.html#setBackground(java.awt.Color)
say: "Setting the background color in the Graphics2D context only
affects the subsequent clearRect calls... " So adding a line to your
if blocks we getif (false) {
    bIG2.setBackground(Color.white);
    bIG2.clearRect(0, 0, buIm.getWidth(), buIm.getHeight());
if (false) {
    bIG2.setColor(Color.black);                    
}Changing the false to true results in a white background (and black
X and text).