CHECKBOXGROUP.. newbie here :(

[kat Vicap]

i cant get this thing to compile. i'm still stucked in this GUI part.

import javax.swing.*;
import java.awt.*;

public class Reservations
{
	public JFrame f;
	public JTextArea[] r;
	public JLabel name, num;
	public JTextField nameField,numField;
	public JCheckBox sm,non,hidden;
	public JButton book;
	public Choice numOfGuests;
	public JPanel roomPanel,inputPanel,buttonPanel;

	public Reservations()
	{
		f= new JFrame("Party Reservations");

		r= new JTextArea[9];


		name= new JLabel("Name:");
		num= new JLabel("Phone number:");
		nameField= new JTextField(15);
		numField= new JTextField(15);
		numOfGuests= new Choice();

		CheckBoxGroup option= new CheckBoxGroup();
		sm= new JCheckBox("Smoking",false,option);
		non= new JCheckBox("Nonsmoking", false, option);
		hidden= new JCheckBox("", true, option);

		book= new JButton("Book Room");

		roomPanel= new JPanel();
		inputPanel= new JPanel();
		buttonPanel= new JPanel();

	}

	public void launch()
	{
		f.setLayout(new BorderLayout());
		roomPanel.setLayout(new GridLayout(2,4,10,10));
		for(int i=1;i<9;i++)
		{
			r[i]= new JTextArea(3,5);
			if(i<6)
				r[i].setText("Room" + i + "Nonsmoking");
			else
				r[i].setText("Room" + i + "Smoking");

			r[i].setEditable(false);
			roomPanel.add(r[i]);
		}

		inputPanel.setLayout(new FlowLayout());
		inputPanel.add(name);
		inputPanel.add(nameField);
		inputPanel.add(num);
		inputPanel.add(numField);
		inputPanel.add(numOfGuests);
					for(int i=8; i<=20; i++)
					numOfGuests.add(String.valueOf(i));
		inputPanel.add(non);
		inputPanel.add(sm);

		buttonPanel.add(book);

		f.add(buttonPanel,BorderLayout.SOUTH);
		f.add(inputPanel,BorderLayout.CENTER);
		f.add(roomPanel,BorderLayout.NORTH);


		f.setVisible(true);
		f.setSize(500,500);
		f.setDefaultCloseOperation(3);
	}
}


    

the error says that it cannot find symbol for the checkboxgroup()
help..

[Rob Spoor]

CheckboxGroup is with a lowercase b. Once you fix that you'll get another 3 compiler errors though, since JCheckBox (Swing) is not compatible with CheckboxGroup (AWT).

It appears you want to use a mutually exclusive selection: only one of the options. In that case, use a ButtonGroup with JRadioButton, not JCheckBox. Replace JCheckBox with JRadioButton and CheckboxGroup with ButtonGroup:

        ButtonGroup option= new ButtonGroup();
        sm= new JRadioButton("Smoking",false);
        option.add(sm);
        non= new JRadioButton("Nonsmoking", false);
        option.add(non);
        hidden= new JRadioButton("", true);
        option.add(hidden);

[kat Vicap]

thank you

[Brian Cole]

Rob Prime wrote:use a ButtonGroup with JRadioButton, not JCheckBox

FYI, I'm pretty sure that ButtonGroup works fine with JCheckBox and JToggleButton in addition to JRadioButton.

[Rob Spoor]

It should as it works with AbstractButton, but visually a JRadioButton is probably better here. A JCheckBox or JToggleButton doesn't say "only one option" like JRadioButton does.