How must I initialize a Graphics object?

Hi,
I've a problem with Graphics Abstract class;
how must I do to initialize a Graphics object?

I must execute this code:

Graphics gr;
gr.drawString("Image",30,0);
gr.drawString("not",30,30);
gr.drawString("Found",30,60);
image.paintIcon(null,gr,0,0);

the compiler returns my the error:
"gr not initialized"

How can I do to initialize this last?

Thank.

You can not instanciate a Graphics object. What you can do is use DebugGraphics.

Using DebugGraphics, when I compile, I've a null pointer exception.

Why?
How Must I rewrite the code?

Thank.

I'm guessing your code looks like:

Code:

---

DebugGraphics dgr;
dgr.drawString("Image",30,0);
dgr.drawString("not",30,30);
dgr.drawString("Found",30,60);
image.paintIcon(null,gr,0,0);

---

Of course you're going to get a NullPointerException. You have declared a DebugGraphics REFERENCE variable called 'dgr'. At no point have you created a DebugGraphics OBJECT and assigned it to the reference.

What you want:

Code:

---

DebugGraphics dgr = new DebugGraphics();
dgr.drawString("Image",30,0);
dgr.drawString("not",30,30);
dgr.drawString("Found",30,60);
image.paintIcon(null,gr,0,0);

---

I have the null pointer exception just when the DebugGraphics object is create.

I don't know why.All seems OK.

I'll wait...

Thanks.

"I have the null pointer exception just when the DebugGraphics object is create."

Is that when you run my code?

"I don't know why.All seems OK."

These seem to be two conflicting statements! Did it work or not?

Yes,
when I run your code;

I've a null pointer exception at the line in which DebugGraphics object is create:

DebugGraphics gr = new DebugGraphics();

I don't belive you! ;-)

Please post the stack trace.

:rolleyes:

I don't know how copy the stackTrace text;
so I have attached the image of it.

I think is the same.

Then, can you explain me how to copy the stackTrace directly for the code of the program, and out of the program in the dos shell.

Thank.

Stack trace: Highlight the text in the console using the mouse. Then right-click. The text is now in clipboard. Now past it into wherever you'd like.

The Problem: I came into this problem a little late, what are you actually trying to do? I've always obtained graphics contexts from controls, rather than creating new ones.