java.lang.Number

[sido]

Hello everybody,

I'm using the constructor:

public DefaultCategoryDataset( java.lang.Number[][] data)

but i don't know what is a java.lang.Number???
when i put :

Number number[][] = {{2, 10, 40} , {8, 12, 3}}; it's false, and i don't understand why??

thanks for help,
sido.

[Altair]

try this
Number number[][] = {{new Integer(2), new Integer(10), new Integer(40)} , {new Integer(8), new Integer(12), new Integer(3)}};

Double/Integer... are an implementation of the abstract class java.lang.Number.

[sido]

thank you, i found the solution, it's what you wrote.

but i have another pb:
how can i create a Graphics2D object?? i need one to draw:

chart.draw(Graphics2D g2, Rectangle2D chartArea, DrawInfo info);


thanks for your help,

sido.

[David Gilbert]

sido wrote:
>
> how can i create a Graphics2D object?? i need one to draw:
>
> chart.draw(Graphics2D g2, Rectangle2D chartArea, DrawInfo
> info);


You don't usually create a Graphics2D, you obtain one from somewhere. If you want to output your charts on screen, use the JFreeChartPanel class - it overrides the paintComponent method in the JPanel class, grabs the Graphics2D object and draws the chart.

Regards,

Dave Gilbert