Java app Graphics object help

Hey, how do I get a graphics object in a Java application? In an applet, the entire thing's a graphics object. I want to somehow draw stuff onto a JPanel or something of the like. How do I do this?!?!?

you need to overload the paint() method inherited from java.awt.Component , for example:
public void paint(Graphics g) {
g.setColor(new java.awt.Color(0,0,255));
g.fillRect(0, 0, getWidth() - 1, getHeight() - 1);
}note that this will totally override the look of the component. I'm not sure whether you can call super.paint() in the event that you are extending a panel or other non-abstract AWT or Swing component.
McF

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JavaFX and Swing integration is documented by Oracle - make sure you understand that before doing further development.
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 case 2:
 GrLevel.setColor(gras2);
 GrLevel.fillRect(0,GroundtoWalk+5,800,300);
 for(int i = 0; 890>i;i=i+5) {
 GrLevel.setColor(gras3);
 GrLevel.drawLine(0+i,GroundtoWalk,-190+i,GroundtoWalk+300);
 for(int i=950; 0<i; i=i-5) {
 GrLevel.setColor(gras1);
 GrLevel.drawLine(890-i,GroundtoWalk,1000-i,GroundtoWalk+300);
 break;
 case 3:
 GrLevel.setColor(gras3);
 GrLevel.fillRect(0,GroundtoWalk+10,800,300);
 for(int i = 0; 800>i; i=i+20) {
 GrLevel.fillArc(0+i,GroundtoWalk,20,20,180,-180);
 break;
 pattern = pt;
 int getGrasPattern() {
 return pattern;
 void drawSky(int cl) {
 GrLevel.setColor(BgColor);
 GrLevel.fillRect(0,0,800,155);
 switch(cl) {
 case 1:
 for(int y = 0;y<7;y++) {
 for(int x = 0;x<800;x=x+20) {
 GrLevel.setColor(Color.white);
 GrLevel.drawArc(x,y*20,20,20,180,180);
 GrLevel.setColor(Color.red);
 GrLevel.drawArc(x,y*20+4,20,20,180,180);
 GrLevel.setColor(Color.yellow);
 GrLevel.drawArc(x,y*20+2,20,20,180,180);
 GrLevel.setColor(Color.green);
 GrLevel.drawArc(x,y*20+8,20,20,180,180);
 GrLevel.setColor(Color.blue);
 GrLevel.drawArc(x,y*20+12,20,20,180,180);
 GrLevel.setColor(Color.pink);
 GrLevel.drawArc(x,y*20+16,20,20,180,180);
 break;
 case 2:
 GrLevel.setColor(Color.gray);
 break;
 sky = cl;
 GrLevel.setFont(BigText);
 GrLevel.setColor(Color.black);
 GrLevel.fillRect(0,0,800,50);
 GrLevel.setColor(Color.white);
 GrLevel.drawString("Score Tabel - comming someday",((size().width)/2)-260, 40);
 int getSkyTyp() {
 return sky;
}I tested running the code of class Level by puting it into Level.java and compiled it...ran it with appletviewer and it worked as it was intended to.
But when i compiled it with MainGame... and in the HTML started MainGame.class,.....applet didn't intializeand i got the following error messege:
Init 1
java.lang.NullPointerException
 at Level.CalcGraphics(MainGame.java:84)
 at MainGame.<init>(MainGame.java:11)Line 82: void CalcGraphics() {
Line 83: ImgLevel = createImage(800,600);
Line 84: GrLevel = ImgLevel.getGraphics(); // The First awt.Graphics object
Line 85: }
Line 9: public MainGame() {
Line 10: Level nr1 = new Level();
Line 11: nr1.CalcGraphics(); // calling the method above -> same error first awt.Graphics Object.
If i change it os that "drawGras" comes first it's first awt.Graphics Line will show the same error
Hope some one can and will help me

As per the documentation of
java.awt.Component.createImage(int,int):
Creates an off-screen drawable image to be used for
double buffering.
Parameters:
width - the specified width
height - the specified height
Returns:
an off-screen drawable image, which can be used for
double buffering. The return value may be null if the
component is not displayable. This will always happen
if GraphicsEnvironment.isHeadless() returns true.
Since:
JDK1.0 its not
ImgLevel = createImage(800,600); that's making the problem but The first awt.Graphics Object in class Level, no mather which on it is =((
>
The key part is '...may be null if the component is
not displayable.'
You should put your graphics initialization code in
start(), which will be called when your applet is
ready to go. Before then, your applet is not
displayable. (Also, remember to dispose() your
graphics in your stop() method, if not sooner.)for the part writen above...I'll try to change it like you are saying.
Thanx for your help!

Cannot resolve symbol java.awt.graphics

// DrawRectangleDemo.java
import java.awt.*;
import java.lang.Object;
import java.applet.Applet;
public class DrawRectangleDemo extends Applet
 public void paint (Graphics g)
 // Get the height and width of the applet's drawing surface.
 int width = getSize ().width;
 int height = getSize ().height;
 int rectWidth = (width-50)/3;
 int rectHeight = (height-70)/2;
 int x = 5;
 int y = 5;
 g.drawRect (x, y, rectWidth, rectHeight);
 g.drawString ("drawRect", x, rectHeight + 30);
 x += rectWidth + 20;
 g.fillRect (x, y, rectWidth, rectHeight);
 // Calculate a border area with each side equal tp 25% of
 // the rectangle's width.
 int border = (int) (rectWidth * 0.25);
 // Clear 50% of the filled rectangle.
 g.clearRect (x + border, y + border,
 rectWidth - 2 * border, rectHeight - 2 * border);
 g.drawString ("fillRect/clearRect", x, rectHeight + 30);
 x += rectWidth + 20;
 g.drawRoundRect (x, y, rectWidth, rectHeight, 15, 15);
 g.drawString ("drawRoundRect", x, rectHeight + 30);
 x=5;
 y += rectHeight + 40;
 g.setColor (Color.yellow);
 for (int i = 0; i < 4; i++)
 g.draw3DRect (x + i * 2, y + i * 2,
 rectWidth - i * 4, rectHeight - i * 4, false);
 g.setColor (Color.black);
 g.drawString ("draw3DRect", x, y, + rectHeight + 25);
 x += rectWidth + 20;
 g.setColor (Color.yellow);
 g.fill3DRect (x, y, rectWidth, rectHeight, true);
 g.setColor (Color.black);
 g.drawString ("fill3DRect", x, y, + rectHeight + 25);
Help me with this codes. I typed correctly but there still errors.
--------------------Configuration: JDK version 1.3.1 <Default>--------------------
D:\Program Files\Xinox Software\JCreator LE\MyProjects\DrawRectangleDemo.java:56: cannot resolve symbol
symbol : method drawString (java.lang.String,int,int,int)
location: class java.awt.Graphics
 g.drawString ("draw3DRect", x, y, + rectHeight + 25);
^
D:\Program Files\Xinox Software\JCreator LE\MyProjects\DrawRectangleDemo.java:64: cannot resolve symbol
symbol : method drawString (java.lang.String,int,int,int)
location: class java.awt.Graphics
 g.drawString ("fill3DRect", x, y, + rectHeight + 25);
^
2 errors
Process completed.
-------------------------------------------------------------------------------------------------------------------------------

cannot resolve symbol
symbol : method drawString (java.lang.String,int,int,int)
This is telling you that you are trying to invoke the drawString() method with 4 parameters: String, int, int, int
If you look at the API the drawString() method need 3 parameters: String, int, int - so you have an extra int
location: class java.awt.Graphics
g.drawString ("draw3DRect", x, y, + rectHeight + 25);
Now is you look at your code you will find that you have 3 ',' in you method call. (I don't think you want the ',' after the y.

Java app Graphics object help

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