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Sep 18th, 2008

JCombobox

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Hi,I had created a Combobox called cboStart at the GUI form...Now I would like to add the integer of 1 to 12 into the combobox,may I know how can I do it?

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daniel50096230

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Sep 18th, 2008

Re: JCombobox

Click to Expand / Collapse Quote originally posted by daniel50096230 ...

Hi,I had created a Combobox called cboStart at the GUI form...Now I would like to add the integer of 1 to 12 into the combobox,may I know how can I do it?

Java Syntax (Toggle Plain Text)
		cboStart.addItem(new Integer(1));
		cboStart.addItem(new Integer(2));  // and so one to 12
 
		cboStart.addItem(1);
		cboStart.addItem(2); // and so one to 12
		cboStart.addItem(new Integer(1));
		cboStart.addItem(new Integer(2));  // and so one to 12
		
		cboStart.addItem(1);
		cboStart.addItem(2); // and so one to 12

Use any of these two methods.

Regards,
PuneetK

Last edited by puneetkay; Sep 18th, 2008 at 1:55 am.

puneetkay

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Sep 18th, 2008

Re: JCombobox

Click to Expand / Collapse Quote originally posted by puneetkay ...

(Toggle Plain Text)
		cboStart.addItem(new Integer(1));
		cboStart.addItem(new Integer(2));  // and so one to 12
		
		cboStart.addItem(1);
		    Java Syntax (Toggle Plain Text)
 
 cboStart.addItem(2);
 cboStart.addItem(2);
 
 // and so one to 12
cboStart.addItem(new Integer(1)); cboStart.addItem(new Integer(2)); // and so one to 12 cboStart.addItem(1); Java Syntax (Toggle Plain Text) cboStart.addItem(2); cboStart.addItem(2); // and so one to 12
Use any of these two methods.

Regards,
PuneetK

The: cboStart.addItem(new Integer(1)) will add Integer objects to the ComboBox and you will have to cast them to Integer when you get the values.
I Think the second is wrong since if I remember correctly the addItem() method takes Objects as arguments.

Better user this:

Java Syntax (Toggle Plain Text)
for (int i=1;i<=12;i++) {
cboStart.addItem(new Integer(i)); //Integer objects in the ComboBox
}
for (int i=1;i<=12;i++) {
cboStart.addItem(new Integer(i)); //Integer objects in the ComboBox
}

Java Syntax (Toggle Plain Text)
for (int i=1;i<=12;i++) {
cboStart.addItem( String.valueOf(i) ); //String objects in the ComboBox. Need to be casted to String when getting the values
}
for (int i=1;i<=12;i++) {
cboStart.addItem( String.valueOf(i) ); //String objects in the ComboBox. Need to be casted to String when getting the values
}

It is not smart to write 12 lines of code when you can simply use a for-loop. What if daniel50096230 wanted to add to a ComboBox numbers for 1 to 31? It would be stupid to write this 31 times:
cboStart.addItem(new Integer(1))
cboStart.addItem(new Integer(2)) ...

Last edited by javaAddict; Sep 18th, 2008 at 4:26 am.

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Sep 18th, 2008

Re: JCombobox

Great...The solution work fines...Thanks a lot...But I have a question here...I would like to add the integer start from 00 to 12,if I using Integer,it will only display 0 instead of 00...Is there any other way rather than using Integer?

daniel50096230

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Re: JCombobox

This spell it out all nicely

peter_budo

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Sep 18th, 2008

Re: JCombobox

Click to Expand / Collapse Quote originally posted by daniel50096230 ...

Great...The solution work fines...Thanks a lot...But I have a question here...I would like to add the integer start from 00 to 12,if I using Integer,it will only display 0 instead of 00...Is there any other way rather than using Integer?

I think, the you better add items as String then you will be able to add 00, and use items index number.

By doing this, you will be able to add 00 and index will be same as value because you will start from 0.

Method : getSelectedIndex() and Int type return

Regards,
PuneetK

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Sep 18th, 2008

Re: JCombobox

Click to Expand / Collapse Quote originally posted by javaAddict ...

The: cboStart.addItem(new Integer(1)) will add Integer objects to the ComboBox and you will have to cast them to Integer when you get the values.
I Think the second is wrong since if I remember correctly the addItem() method takes Objects as arguments.

With Java 1.5 or later, Integer.valueOf(1) would be preferable to constructing a new Integer.

The second method, cboStart.addItem(1) also works just fine because auto-boxing will make the conversion to an Integer object for you.

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Sep 18th, 2008

Re: JCombobox

Click to Expand / Collapse Quote originally posted by Ezzaral ...

The second method, cboStart.addItem(1) also works just fine because auto-boxing will make the conversion to an Integer object for you.

OK, good to know.

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