[X] My Assistant

[67039]

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

CODE

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;
}
}

[pbl]

What you call a "pull down" is a JComboBox

http://java.sun.com/javase/6/docs/api/java.../JComboBox.html

CODE

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

[67039]

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

CODE

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;
}
}

What you call a "pull down" is a JComboBox

http://java.sun.com/javase/6/docs/api/java.../JComboBox.html

CODE

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

[pbl]

CODE

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

CODE

  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