Access an object by its name as string

[Wiz]

Hi there,
I have some JTextField objects, called jtf0, jtf1, jtf2, and so on.
How I can access their properties by their names known as string? For
instance:


for(int i=0; i<10; i++) {
function_to_get_a_reference("jtf" + i).setText("hello " + i);
}


Does a function like this exist? With other languages I'd use the eval()
function, but I couldn't fint it in Java.
Thanks in advance to everyone can help me.
Bye

Marco


ps: sorry for my bad english..

 

[Harald Hein]

I have some JTextField objects, called jtf0, jtf1, jtf2, and so
on.

No, you have object references called jtf...

How I can access their properties by their names known as
string? For instance:


for(int i=0; i<10; i++) {
function_to_get_a_reference("jtf" + i).setText("hello " + i);
}

Use an array or a collection class for the references.

JTextField jtf[] = ... // fill array here
for(int i = 0; i < 10; i++) {
jtf.setText("hello" + i);
}

Does a function like this exist?

You can start to mess with the reflection API, but it is overkill.

With other languages I'd use the
eval() function, but I couldn't fint it in Java.

If you want a true equivalent of eval(), you need to fire up the
compiler from within your application. Then you load the resulting
class with a class loader. Also overkill for your problem.

 

[Wiz]

Original message from Harald Hein, Mon 22 December 2003 12:30:

No, you have object references called jtf...

yes, right

How I can access their properties by their names known as
string? For instance:


for(int i=0; i<10; i++) {
function_to_get_a_reference("jtf" + i).setText("hello " + i);
}

Use an array or a collection class for the references.

JTextField jtf[] = ... // fill array here
for(int i = 0; i < 10; i++) {
jtf.setText("hello" + i);
}

I used this solution before, but now I'm developing an application with
netBeans. Do you know how I can use an array for references without lose
the possibility to use the gui form editor?
Thanks a lot

Marco

 

[Christophe Vanfleteren]

Original message from Harald Hein, Mon 22 December 2003 12:30:

No, you have object references called jtf...

yes, right

How I can access their properties by their names known as
string? For instance:


for(int i=0; i<10; i++) {
function_to_get_a_reference("jtf" + i).setText("hello " + i);
}

Use an array or a collection class for the references.

JTextField jtf[] = ... // fill array here
for(int i = 0; i < 10; i++) {
jtf.setText("hello" + i);
}

I used this solution before, but now I'm developing an application with
netBeans. Do you know how I can use an array for references without lose
the possibility to use the gui form editor?
Thanks a lot

Marco

Please don't multipost, I gave you an answer to the orignal question in
c.l.j.help.

Just create the array yourself and populate them with the references to the
JTextFields the gui editor creates for you.