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JCombobox

Sep 18th, 2008

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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Re: JCombobox

Sep 18th, 2008

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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?

 Help with Code Tags 
 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.

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Re: JCombobox

Sep 18th, 2008

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Originally Posted by puneetkay

Help with Code Tags

(Toggle Plain Text)
		cboStart.addItem(new Integer(1));
		cboStart.addItem(new Integer(2));  // and so one to 12
		
		cboStart.addItem(1);
		     Help with Code Tags 
  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); Help with Code Tags 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:

 Help with Code Tags 
 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
}

 Help with Code Tags 
 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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Re: JCombobox

Sep 18th, 2008

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?

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Re: JCombobox

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Sep 18th, 2008

This spell it out all nicely

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puneetkay

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Re: JCombobox

Sep 18th, 2008

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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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www.PuneetK.com
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Re: JCombobox

Sep 18th, 2008

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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.