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From: beowolf on 6 May 2010 02:55
Hi all,
this code works as expected when it's inline in the program:
(jTAfd is "public static javax.swing.JTable jTAfd;"):

try {
jTAfd.print(JTable.PrintMode.FIT_WIDTH, null, null);
} catch (Exception pe) {
System.err.println("*** Error printing: " + pe.getMessage());
}

when I try to make it as a routine (whit the table to be printed
passed as parameter):

Component componente = null;
componente = jTAfd;
myPrint(componente);
.....
void myPrint(Component c){
try {
c.print(JTable.PrintMode.FIT_WIDTH, null, null);
} catch (Exception pe) {
System.err.println("*** Error printing: " + pe.getMessage());
}
}

it does not compile:
.... print(java.awt.Graphics) in java.awt.Component cannot be applied
to
(javax.swing.JTable.PrintMode,<nulltype>,<nulltype>)
c.print(JTable.PrintMode.FIT_WIDTH, null, null);

why does javac picks up print(Graphics) instead of
javax.swing.JTable.print(); ?
I've tried almost all reasonable includes, can anyone help me ?
Thank you !
From: Java coder on 6 May 2010 04:40
beowolf a �crit :

> void myPrint(Component c){
> try {
> c.print(JTable.PrintMode.FIT_WIDTH, null, null);
> } catch (Exception pe) {
> System.err.println("*** Error printing: " + pe.getMessage());
> }
> }
>
> it does not compile:
> ... print(java.awt.Graphics) in java.awt.Component cannot be applied
> to
> (javax.swing.JTable.PrintMode,<nulltype>,<nulltype>)
> c.print(JTable.PrintMode.FIT_WIDTH, null, null);
>
> why does javac picks up print(Graphics) instead of
> javax.swing.JTable.print(); ?
> I've tried almost all reasonable includes, can anyone help me ?

You must be beginner... What's the type of c in your method ? Does this
type have the method print() with 3 parameters ?
From: Lew on 6 May 2010 07:49
On 05/06/2010 02:55 AM, beowolf wrote:
> this code works as expected when it's inline in the program:
> (jTAfd is "public static javax.swing.JTable jTAfd;"):
>
> try {
> jTAfd.print(JTable.PrintMode.FIT_WIDTH, null, null);

Here the variable is declared as 'JTable', presumably. You don't show the
code so we have to hope you declared it correctly.

> } catch (Exception pe) {
> System.err.println("*** Error printing: " + pe.getMessage());
> }
>
> when I try to make it as a routine (whit the table to be printed
> passed as parameter):
>
> Component componente = null;
> componente = jTAfd;
> myPrint(componente);
> ....
> void myPrint(Component c){

Here, 'c' is declared as 'Component', and that type does not have the method
overload you try to use.

> try {
> c.print(JTable.PrintMode.FIT_WIDTH, null, null);
> } catch (Exception pe) {
> System.err.println("*** Error printing: " + pe.getMessage());
> }
> }
>
> it does not compile:
> ... print(java.awt.Graphics) in java.awt.Component cannot be applied
> to
> (javax.swing.JTable.PrintMode,<nulltype>,<nulltype>)
> c.print(JTable.PrintMode.FIT_WIDTH, null, null);
>
> why does javac picks up print(Graphics) instead of
> javax.swing.JTable.print(); ?

Because 'c' is a 'Component' variable, not 'JTable'.

> I've tried almost all reasonable includes, can anyone help me ?

What do you mean by "includes"?

The compiler has no way to know the run-time type of 'c'; it has to work only
with the compile-time type.

You also should not mix AWT components and Swing components.

--
Lew
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