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Cafe Java Applet

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Cafe Java Applet need help making pull down lists Rate Topic: -----

#1 67039  Icon User is offline

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Post icon  Posted 11 May 2009 - 05:22 PM

hi, I need assistance on my homework. I am supposed to create a pizza java applet with 2 pull downs. I can not figure out how to make them pull downs. Any ideas? This program works as a checklist but I can not figure out the pull down method. Any help would be appreciated.

thanks again

 

import java.applet.*;
import java.awt.*;
import java.awt.event.*;

public class pizza extends Applet implements ItemListener{
  private Checkbox pepperoni, olive, onion, sausage, peppers, cheese;
  private Checkbox ham, pineapple, anchovies;
  private TextField t;
  private CheckboxGroup pizzaSize;
  private Checkbox small, medium, large, ex_large;
  float price = 7.00f, valPep = 0, valOli = 0, valOni = 0, valSau = 0;
  float valPpp = 0, valChe = 0, valHam = 0, valPin = 0, valAnc = 0;
  float size = 7.00f;

  public void init() {
  
	setLayout(new GridLayout(13,1));
	pizzaSize = new CheckboxGroup();
	add(new Label("Welcome to my Pizzeria, what size pizza would you like?", Label.CENTER));
	small = new Checkbox("Small", pizzaSize, false);
	small.addItemListener(this);
	add(small);
	medium = new Checkbox("Medium", pizzaSize, false);
	medium.addItemListener(this);
	add(medium);
	large = new Checkbox("Large", pizzaSize, false);
	large.addItemListener(this);
	add(large);
	ex_large = new Checkbox("Extra Large", pizzaSize, false);
	ex_large.addItemListener(this);
	add(ex_large);
	add(new Label("Please select your toppings? ($1.00 additional per topping)",
Label.CENTER));
	pepperoni = new Checkbox("Pepperoni");
	pepperoni.addItemListener(this);
	add(pepperoni);
	olive = new Checkbox("Olives");
	olive.addItemListener(this);
	add(olive);
	onion = new Checkbox("Onions");
	onion.addItemListener(this);
	add(onion);
	sausage = new Checkbox("Sausage");
	sausage.addItemListener(this);
	add(sausage);
	peppers = new Checkbox("Peppers");
	peppers.addItemListener(this);
	add(peppers);
	cheese = new Checkbox("Extra Cheese");
	cheese.addItemListener(this);
	add(cheese);
	ham = new Checkbox("Ham");
	ham.addItemListener(this);
	add(ham);
	pineapple = new Checkbox("Pineapple");
	pineapple.addItemListener(this);
	add(pineapple);
	anchovies = new Checkbox("Anchovies");
	anchovies.addItemListener(this);
	add(anchovies);
	
	t = new TextField("$" + String.valueOf(price));
	t.setEditable(false); 
	add(t);
  }
  
  public void itemStateChanged (ItemEvent e) {

	  if(e.getSource() == small){
	  price -= size;
	  size = 7.00f;
	  price += size;
	}
	  if(e.getSource() == medium){
 	  price -= size;
		size = 9.00f;
	  price += size;
	}
	  if(e.getSource() == large){
	  price -= size;
	  size = 11.00f;
	  price += size;
	}
	if(e.getSource() == ex_large){
	  price -= size;
	  size = 14.00f;
	  price += size;
	}
	  if(e.getSource() == pepperoni){
		valPep = (pepperoni.getState() ?  1.00f : -1.00f);
		price += valPep;
	  }
	  if(e.getSource() == olive){
		valOli = (olive.getState() ?  1.00f : -1.00f);
		price += valOli;
	}
	  if(e.getSource() == onion){
	  valOni = (onion.getState() ?  1.00f : -1.00f);
	  price += valOni;
	}
	  if(e.getSource() == sausage){
	  valSau = (sausage.getState() ?  1.00f : -1.00f);
	  price += valSau;
	}
	if(e.getSource() == peppers){
	  valPpp = (peppers.getState() ?  1.00f : -1.00f);
	  price += valPpp;
	}
	if(e.getSource() == cheese){
		valChe = (cheese.getState() ?  1.00f : -1.00f);
	  price += valChe;
	}
	if(e.getSource() == ham){
		valHam = (ham.getState() ?  1.00f : -1.00f);
	  price += valHam;	
	}
	if(e.getSource() == pineapple){
		valPin = (pineapple.getState() ?  1.00f : -1.00f);
	  price += valPin;
	}
	if(e.getSource() == anchovies){
		valAnc = (anchovies.getState() ?  1.00f : -1.00f);
	  price += valAnc;
	}
	  t.setText("$" + String.valueOf(price));
	  return;
  }
  
 public boolean handleCheckbox(Checkbox c){
	  if(c.getState())
	  price += 1.00f;
	else
	  price -= 1.00f;
	t.setText("$" + String.valueOf(price));
	return true;
 }
}

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#2 pbl  Icon User is offline

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Posted 11 May 2009 - 06:24 PM

What you call a "pull down" is a JComboBox

http://java.sun.com/.../JComboBox.html

String[] size = {"Small", "Medium", "Large"};
double[] price = {10.0, 12.0, 15.0};
JComboBox combo = new JComboBox(size);

// in your action listener when you determine the price
int index = combo.getSelectedIndex();
double total = price[index];	// get base price according to size


Happy coding
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#3 67039  Icon User is offline

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Posted 11 May 2009 - 06:53 PM

hmm, did I enter it in the wrong area, I am getting error codes
I inserted the code and tookout the checkbox fields.



import java.applet.*;
import java.awt.*;
import java.awt.event.*;

public class pizzab extends Applet implements ItemListener{
  private Checkbox pepperoni, olive, onion, sausage, peppers, cheese;
  private Checkbox ham, pineapple, anchovies;
  private TextField t;
  JComboBox combo = new JComboBox(size);

  String[] size = {"Small", "Medium", "Large", "Xtra Large"};
double[] price = {7.0, 9.0, 11.0, 14.0};


// in your action listener when you determine the price
int index = combo.getSelectedIndex();
double total = price[index];	// get base price according to size

  

  public void init() {
  
	setLayout(new GridLayout(13,1));
	pizzaSize = new CheckboxGroup();
	add(new Label("Welcome to my Pizzeria, what size pizza would you like?", Label.CENTER));
	small = new Checkbox("Small", pizzaSize, false);
	small.addItemListener(this);
	add(small);
	medium = new Checkbox("Medium", pizzaSize, false);
	medium.addItemListener(this);
	add(medium);
	large = new Checkbox("Large", pizzaSize, false);
	large.addItemListener(this);
	add(large);
	ex_large = new Checkbox("Extra Large", pizzaSize, false);
	ex_large.addItemListener(this);
	add(ex_large);
	add(new Label("Please select your toppings? ($1.00 additional per topping)",
Label.CENTER));
	pepperoni = new Checkbox("Pepperoni");
	pepperoni.addItemListener(this);
	add(pepperoni);
	olive = new Checkbox("Olives");
	olive.addItemListener(this);
	add(olive);
	onion = new Checkbox("Onions");
	onion.addItemListener(this);
	add(onion);
	sausage = new Checkbox("Sausage");
	sausage.addItemListener(this);
	add(sausage);
	peppers = new Checkbox("Peppers");
	peppers.addItemListener(this);
	add(peppers);
	cheese = new Checkbox("Extra Cheese");
	cheese.addItemListener(this);
	add(cheese);
	ham = new Checkbox("Ham");
	ham.addItemListener(this);
	add(ham);
	pineapple = new Checkbox("Pineapple");
	pineapple.addItemListener(this);
	add(pineapple);
	anchovies = new Checkbox("Anchovies");
	anchovies.addItemListener(this);
	add(anchovies);
	
	t = new TextField("$" + String.valueOf(price));
	t.setEditable(false); 
	add(t);
  }
  
  public void itemStateChanged (ItemEvent e) {

	  if(e.getSource() == small){
	  price -= size;
	  size = 7.00f;
	  price += size;
	}
	  if(e.getSource() == medium){
 	  price -= size;
		size = 9.00f;
	  price += size;
	}
	  if(e.getSource() == large){
	  price -= size;
	  size = 11.00f;
	  price += size;
	}
	if(e.getSource() == ex_large){
	  price -= size;
	  size = 14.00f;
	  price += size;
	}
	  if(e.getSource() == pepperoni){
		valPep = (pepperoni.getState() ?  1.00f : -1.00f);
		price += valPep;
	  }
	  if(e.getSource() == olive){
		valOli = (olive.getState() ?  1.00f : -1.00f);
		price += valOli;
	}
	  if(e.getSource() == onion){
	  valOni = (onion.getState() ?  1.00f : -1.00f);
	  price += valOni;
	}
	  if(e.getSource() == sausage){
	  valSau = (sausage.getState() ?  1.00f : -1.00f);
	  price += valSau;
	}
	if(e.getSource() == peppers){
	  valPpp = (peppers.getState() ?  1.00f : -1.00f);
	  price += valPpp;
	}
	if(e.getSource() == cheese){
		valChe = (cheese.getState() ?  1.00f : -1.00f);
	  price += valChe;
	}
	if(e.getSource() == ham){
		valHam = (ham.getState() ?  1.00f : -1.00f);
	  price += valHam;	
	}
	if(e.getSource() == pineapple){
		valPin = (pineapple.getState() ?  1.00f : -1.00f);
	  price += valPin;
	}
	if(e.getSource() == anchovies){
		valAnc = (anchovies.getState() ?  1.00f : -1.00f);
	  price += valAnc;
	}
	  t.setText("$" + String.valueOf(price));
	  return;
  }
  
 public boolean handleCheckbox(Checkbox c){
	  if(c.getState())
	  price += 1.00f;
	else
	  price -= 1.00f;
	t.setText("$" + String.valueOf(price));
	return true;
 }
}

View Postpbl, on 11 May, 2009 - 06:24 PM, said:

What you call a "pull down" is a JComboBox

http://java.sun.com/.../JComboBox.html

String[] size = {"Small", "Medium", "Large"};
double[] price = {10.0, 12.0, 15.0};
JComboBox combo = new JComboBox(size);

// in your action listener when you determine the price
int index = combo.getSelectedIndex();
double total = price[index];	// get base price according to size


Happy coding

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#4 pbl  Icon User is offline

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Posted 11 May 2009 - 07:07 PM 

 JComboBox combo = new JComboBox(size);

  String[] size = {"Small", "Medium", "Large", "Xtra Large"};


size has to be defined BEFORE you can use it as constructor for the combo :) 
  String[] size = {"Small", "Medium", "Large", "Xtra Large"};
 JComboBox combo = new JComboBox(size);


*Edited damn English it is "as" not "has"

This post has been edited by pbl: 11 May 2009 - 07:08 PM

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