Graphics Error

[TurtleGuy910]

I have been trying to make a java graphics program but whenever i try to make it work nothing happens, no window appears. Here is my source code:

import java.awt.*;

public class graphics {
public static void main(String args[]){

}
public void paint(Graphics g){
g.drawRect(300, 200, 75, 75);
}
}
p.s. the reason i have a public static void main without anything in it is because otherwise when i run it, it says i need to have a public static void main(String args[]) in it.

[Nepomuk]

public static void main(String[] args) is the main method - the program does, what this function tells it to do. So if you just change it like this:

public static void main(String args[]){
    paint(graphic); // "graphic" being, what ever should be drawn
}
 

you should at least get some reaction. However, I haven't used awt yet, so I don't know, if that will be your problem solved.

[r035198x]

I have been trying to make a java graphics program but whenever i try to make it work nothing happens, no window appears. Here is my source code:

import java.awt.*;

public class graphics {
public static void main(String args[]){

}
public void paint(Graphics g){
g.drawRect(300, 200, 75, 75);
}
}
p.s. the reason i have a public static void main without anything in it is because otherwise when i run it, it says i need to have a public static void main(String args[]) in it.

OK. Um, you need to be painting somewhere you see. Now you don't paint to the console like that. Read Sun's painting tutorial to see how it's done.

[TurtleGuy910]

Does that mean that i should place the public void paint(Graphics g) should be within the public static void main

[r035198x]

Does that mean that i should place the public void paint(Graphics g) should be within the public static void main

All that stuff is wrong. See my reply above.

[Nepomuk]

Does that mean that i should place the public void paint(Graphics g) should be within the public static void main

You will have to use the public static void main at some point, but as r035198x pointed out, there are other things to be done too.

[JosAH]

I have been trying to make a java graphics program but whenever i try to make it work nothing happens, no window appears. Here is my source code:

import java.awt.*;

public class graphics {
public static void main(String args[]){

}
public void paint(Graphics g){
g.drawRect(300, 200, 75, 75);
}
}
p.s. the reason i have a public static void main without anything in it is because otherwise when i run it, it says i need to have a public static void main(String args[]) in it.

The JVM invokes your public static void main(String[] args) allright, but that
method is just empty so it doesn't do anything. Who or what do you expect to
invoke that public void paint(Graphics g) method? Only AWT Components
or Swing JComponents have that method invoked when needed, but you
don't have any of those. Please read a Swing/AWT tutorial before you expect
automagic things to happen.

kind regards,

Jos

[r035198x]

The JVM invokes your public static void main(String[] args) allright, but that
method is just empty so it doesn't do anything. Who or what do you expect to
invoke that public void paint(Graphics g) method? Only AWT Components
or Swing JComponents have that method invoked when needed, but you
don't have any of those. Please read a Swing/AWT tutorial before you expect
automagic things to happen.

kind regards,

Jos

There's no such word as automagic.

[JosAH]

There's no such word as automagic.

Yes there is; you just saw it so it exists. It even associates with quite a lot of
other things so it's an existing, semantically rich word; it can even be a noun.

automagically yours,

Jos ;-)

[praveen2gupta]

I have been trying to make a java graphics program but whenever i try to make it work nothing happens, no window appears. Here is my source code:

import java.awt.*;

public class graphics {
public static void main(String args[]){

}
public void paint(Graphics g){
g.drawRect(300, 200, 75, 75);
}
}
p.s. the reason i have a public static void main without anything in it is because otherwise when i run it, it says i need to have a public static void main(String args[]) in it.

Hi
I think you are not aware that what is your problem. Better Read Applets that will be good for the better understanding of your program.

[TurtleGuy910]

I can make the window appear but nothing appears on it. This is my code:

 import java.awt.Graphics;
 
import javax.swing.SwingUtilities;
import javax.swing.JFrame;
 
public class graphicsprogram {
 
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }
 
   public void paint(Graphics g){
 g.drawRect(100,100,75,75);
}
    private static void createAndShowGUI() {
        JFrame f = new JFrame("graphics program");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setSize(250, 250);
        f.setVisible(true); 
   }
}

[r035198x]

I can make the window appear but nothing appears on it. This is my code:

 import java.awt.Graphics;
 
import javax.swing.SwingUtilities;
import javax.swing.JFrame;
 
public class graphicsprogram {
 
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }
 
   public void paint(Graphics g){
 g.drawRect(100,100,75,75);
}
    private static void createAndShowGUI() {
        JFrame f = new JFrame("graphics program");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setSize(250, 250);
        f.setVisible(true); 
   }
}

See what they used for a drawing surface in this example.
You really need to go through that tutorial before you start writing some code.