Thread: JCheckboxes Item Listener

import java.awt.*;
import javax.swing.*;
 
import java.awt.event.*;
public class JPizza extends JFrame implements ItemListener
{
	private int pizza = 0;
	FlowLayout flow = new FlowLayout(); 
	double toppings = 0;
	double sizes;
	double totalprice = toppings + sizes;
	JLabel label = new JLabel("Please choose the size of pizza you would like and the topping : )"); 
	JLabel label2 = new JLabel("Your total price is : " + totalprice);
	final int FRAME_WIDTH = 600; 
	final int FRAME_HEIGHT = 400; 
	JCheckBox pepperoni= new JCheckBox("pepperoni"); 
	JCheckBox sausage= new JCheckBox("cheese"); 
	JCheckBox mushrooms= new JCheckBox("mushrooms"); 
	JCheckBox peppers= new JCheckBox("peppers"); 
	JCheckBox pineapples= new JCheckBox("pineapples");
	String[] pizzasize = { "small", "medium", "large", "xlarge"}; 
	JComboBox size = new JComboBox(pizzasize); 
	public JPizza() 
	{ 
	super("Pizzeria Menu and Prices"); 
	size.addItemListener(this);
	setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
	setLayout (new FlowLayout()); 
	getContentPane().setBackground(Color.black); 
 
	label.setFont(new Font("Arial", Font.BOLD, 18)); 
	label.setForeground(Color.white); 
	label2.setFont(new Font("Arial", Font.BOLD, 18));
	label2.setForeground(Color.white); 
	size.setFont(new Font("Arial", Font.BOLD, 22)); 
	size.setForeground(Color.white); 
	size.setBackground(Color.black); 
	pepperoni.addItemListener(this); 
	mushrooms.addItemListener(this); 
	sausage.addItemListener(this); 
	peppers.addItemListener(this); 
 
	pineapples.addItemListener(this); 
	pepperoni.setForeground(Color.white); 
	sausage.setForeground(Color.white); 
	mushrooms.setForeground(Color.white); 
	peppers.setForeground(Color.white); 
	pineapples.setForeground(Color.white); 
	pepperoni.setBackground(Color.black); 
	sausage.setBackground(Color.black); 
	mushrooms.setBackground(Color.black); 
	peppers.setBackground(Color.black); 
	pineapples.setBackground(Color.black); 
 
	add(pepperoni); 
	add(sausage); 
	add(mushrooms); 
	add(peppers); 
	add(pineapples); 
	add(label); 
	add(size); 
	setSize(FRAME_WIDTH, FRAME_HEIGHT); 
	add(label2);
	}
	 public void itemStateChanged2(ItemEvent e) {
		  if (pepperoni.isSelected ()) {
			  toppings ++;
		    } else {
		    	toppings --;
		    }
		  if (sausage.isSelected ()) {
			  toppings ++;
		    } else {
		    	toppings --;
		    }
		  if (mushrooms.isSelected ()) {
			  toppings ++;
		    } else {
		    	toppings --;
		    }
		  if (peppers.isSelected ()) {
			  toppings ++;
		    } else {
		    	toppings --;
		    }
		  if (pineapples.isSelected ()) {
			  toppings ++;
		    } else {
		    	toppings --;
		    }
	 }
	   public void itemStateChanged(ItemEvent e) {
	        if (size.getSelectedItem().equals("small")) {
	        	sizes =7;
	        }
	        if (size.getSelectedItem().equals("medium")) {
	        	sizes =9;
	        }
	        if (size.getSelectedItem().equals("large")) {
	        	sizes =11;
	        }
	        if (size.getSelectedItem().equals("xlarge")) {
	        	sizes =14;
	        }
 
	    }
		public static void main(String[] args) 
		{ 
		JPizza frame = new JPizza(); 
		frame.setVisible(true); 
 
 
 
	} 
 
	}

// I got everything to not give an error in my code... However, I need to display the total price ,and when i run the program the total price stays 0 instead of changing from what check box is highlighted etc. I need help to display the total price.

With the itemlistener, I believe I put if the size is selected in the Jcheckbox the size (small,medium,large,xlarge) is given a value in the if statements.

the double toppings is given a value of 0. However, if the boxes are selected with check marks then toppings ++ which will add 1. If the box is unhighted it will -1.

the totalprice is calculated by the other two doubles.

double toppings and double sizes

I am sorry for not putting the wrap around it

If I wanted to add up after the code and display it in the box , how would i do so?

So, I thought it would calculate as you pick your selections... However, will i have to make a button that once clicked will display the total of the users selection?

I tried making a button using ActionListener, however I cant use an actionlistener with a itemlistener. Is there a reason for that ,and how would i go about making a button to calculate total.

i resolved the problem with actionlistener and item listener. I got the total to display and i played around however my toppings arent working. the sizes are working in the code but the toppings are not. When a topping is checked i want the int toppings to add 1 to its value but its not...

import java.awt.*;
import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
 
import java.awt.event.*;
public class JPizza extends JFrame implements ItemListener, ActionListener
{
	private int pizza = 0;
	FlowLayout flow = new FlowLayout(); 
	int toppings = 1;
	int sizes;
	int totalprice;
	JLabel label = new JLabel("Please choose the size of pizza you would like and the topping : )"); 
	final int FRAME_WIDTH = 600; 
	final int FRAME_HEIGHT = 400; 
	JCheckBox pepperoni= new JCheckBox("pepperoni"); 
	JCheckBox sausage= new JCheckBox("cheese"); 
	JCheckBox mushrooms= new JCheckBox("mushrooms"); 
	JCheckBox peppers= new JCheckBox("peppers"); 
	JCheckBox pineapples= new JCheckBox("pineapples");
	String[] pizzasize = { "small", "medium", "large", "xlarge"}; 
	JComboBox size = new JComboBox(pizzasize); 
	private JButton button1 = new JButton("Calculate");
 
	public JPizza() 
	{ 
	super("Pizzeria Menu and Prices"); 
	size.addItemListener(this);
	setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
	setLayout (new FlowLayout()); 
	getContentPane().setBackground(Color.black); 
	label.setFont(new Font("Arial", Font.BOLD, 18)); 
	label.setForeground(Color.white); 
 
	size.setFont(new Font("Arial", Font.BOLD, 22)); 
	size.setForeground(Color.white); 
	size.setBackground(Color.black); 
	pepperoni.addItemListener(this); 
	mushrooms.addItemListener(this); 
	sausage.addItemListener(this); 
	peppers.addItemListener(this); 
 
	pineapples.addItemListener(this); 
	pepperoni.setForeground(Color.white); 
	sausage.setForeground(Color.white); 
	mushrooms.setForeground(Color.white); 
	peppers.setForeground(Color.white); 
	pineapples.setForeground(Color.white); 
	pepperoni.setBackground(Color.black); 
	sausage.setBackground(Color.black); 
	mushrooms.setBackground(Color.black); 
	peppers.setBackground(Color.black); 
	pineapples.setBackground(Color.black); 
 
	add(pepperoni); 
	add(sausage); 
	add(mushrooms); 
	add(peppers); 
	add(pineapples); 
	add(label); 
	add(size); 
	setSize(FRAME_WIDTH, FRAME_HEIGHT); 
 
	JPanel panel1 = new JPanel();
	Container con = getContentPane();
	con.setLayout(new FlowLayout());
	con.add(panel1);
	panel1.add(button1);
	panel1.setBackground(Color.black);
	button1.addActionListener(this);
 
	}
	 public void itemStateChanged2(ItemEvent e) {
		 if (pepperoni.isSelected ()) {
			  toppings ++;
		    } else {
		    	toppings --;
		    }
		  if (sausage.isSelected ()) {
			  toppings ++;
		    } else {
		    	toppings --;
		    }
		  if (mushrooms.isSelected ()) {
			  toppings ++;
		    } else {
		    	toppings --;
		    }
		  if (peppers.isSelected ()) {
			  toppings ++;
		    } else {
		    	toppings --;
		    }
		  if (pineapples.isSelected ()) {
			  toppings ++;
		    } else {
		    	toppings --;
		    }
	 }
	   public void itemStateChanged(ItemEvent e) {
	        if (size.getSelectedItem().equals("small")) {
	        	sizes =7;
	        }
	        if (size.getSelectedItem().equals("medium")) {
	        	sizes =9;
	        }
	        if (size.getSelectedItem().equals("large")) {
	        	sizes =11;
	        }
	        if (size.getSelectedItem().equals("xlarge")) {
	        	sizes =14;
	        }
 
	    }
	public void actionPerformed(ActionEvent e)
	{
		totalprice = toppings + sizes;
		JOptionPane.showMessageDialog(null,"This will cost " + totalprice);
	}
 
		public static void main(String[] args) 
		{ 
		JPizza frame = new JPizza(); 
		frame.setVisible(true); 
 
 
 
	} 
 
	}