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Please Help!

1 reply on 1 page. Most recent reply: May 12, 2002 10:29 AM by Evgen

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Khalid

Posts: 1
Nickname: khalid
Registered: May, 2002

Please Help!

Posted: May 12, 2002 7:57 AM

Dear Helper

Ok so I am struggling to get this done. I know it is very simple but can't find my way around it. If you can help I will be more than thankful.

I have isolated the main problem from the whole Applet so I am presenting just that part of the Applet which is giving me problems:

Objective: To have two drop down boxes and a button to get their values and display them, so i can pass the variables to another class for complex calculations - simple I am just concerned about getting two values from drop down boxes here is the code:

//IMPORT

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

public class itemtest extends Applet implements ActionListener,ItemListener
{

//<----DECLARATIONS-------------->

Choice choice1;
int khalid1;
String value1, value2;
BookingDialog d;
Calculation v;

//<---------INIT METHOD-------------->

public void init(){

setSize(500,375);
setBackground(Color.lightGray);
setForeground(Color.black);

//Create a two Choice Menus

Choice choice1 = new Choice();
choice1.setForeground(Color.white);
choice1.setBackground(Color.darkGray);
choice1.addItem("Choose Show");
choice1.addItem("Show1");
choice1.add("Show2");
choice1.add ("Show3");
this.add(choice1);

Choice choice2 = new Choice();
choice2.setForeground(Color.white);
choice2.setBackground(Color.darkGray);
choice2.addItem("10");
choice2.addItem("20");
choice2.add("30");
choice2.add ("40");
this.add(choice2);

//Button

Button b1=new Button("Book Now");
b1.setFont(new Font("SansSerif", 1, 12));
b1.setForeground(Color.black);
add(b1);
b1.addActionListener(this);

}//<----------END INIT METHOD------------------>

/*BELOW ARE ALL THE METHODS I HAVE BEEN TRYING THIS IS WHERE I NEED HELP
TO GET THE VALUE OF BOTH THE DROP DOWN BOXES AND ADD THEM. It compiles
gracefully but at execution I get the NULL POINTER EXCEPTION */

<------------------------------------------------------------------->

public void itemStateChanged(ItemEvent e){

// String sendvalue=(String) e.getItem();
// khalid=Integer.parseInt(sendvalue);
// repaint();
}

public String getchoice1()
{
String value1 = choice1.getItem(choice1.getSelectedIndex());
String value2 = choice2.getItem(choice2.getSelectedIndex());
return value1,value2;
}

public void actionPerformed(ActionEvent e){
if(e.getActionCommand() == "Book Now")
{

getchoice1();

//String sendvalue=choice1.getItem(choice1.getSelectedIndex());
//int sendvalue=choiceTickets.getSelectedIndex();
//d=new BookingDialog(new Frame());
//v=new Calculation(new Frame(),value1,value2);
}
}
public void paint(Graphics g){
g.drawString("The sendvalue is "+value1+value2,50,100);
}
}

Evgen

Posts: 14
Nickname: evgen79
Registered: May, 2002

Re: Please Help!

Posted: May 12, 2002 10:29 AM

You can return 2 string if declared return type one string.

////////////////////////////////////////////

import java.applet.*; 
import java.awt.*; 
import java.awt.event.*; 
 
public class itemtest extends Applet implements ActionListener,ItemListener 
{ 
//<----DECLARATIONS--------------> 
 
Choice choice1, choice2; 
Label l1, l2;
int khalid1; 
String value1, value2; 
 
//<---------INIT METHOD--------------> 
public void init(){ 
setSize(500,375); 
setBackground(Color.lightGray); 
setForeground(Color.black); 
 
//Create a two Choice Menus 
choice1 = new Choice(); 
choice1.setForeground(Color.white); 
choice1.setBackground(Color.darkGray); 
choice1.addItem("Choose Show"); 
choice1.addItem("Show1"); 
choice1.add("Show2"); 
choice1.add ("Show3"); 
this.add(choice1);
 
choice2 = new Choice(); 
choice2.setForeground(Color.white); 
choice2.setBackground(Color.darkGray); 
choice2.addItem("10"); 
choice2.addItem("20"); 
choice2.add("30"); 
choice2.add ("40"); 
this.add(choice2); 
 
//Button 
Button b1=new Button("Book Now"); 
b1.setFont(new Font("SansSerif", 1, 12)); 
b1.setForeground(Color.black); 
add(b1); 
b1.addActionListener(this); 
 
//Labels of first and second values
l1 = new Label("                 ");
l2 = new Label("                 ");
add(l1); add(l2);
 
}//<----------END INIT METHOD------------------> 
 
 
//<-------------------------------------------------------------------> 
public void itemStateChanged(ItemEvent e){ 
} 
 
public String[] getchoice1() 
{ 
String[] str;
String value1 = choice1.getItem(choice1.getSelectedIndex()); 
String value2 = choice2.getItem(choice2.getSelectedIndex()); 
str = new String[2];
str[0] = value1;
str[1] = value2;
return str;
} 
 
 
public void actionPerformed(ActionEvent e){ 
if(e.getActionCommand() == "Book Now") 
{ 
String[] StrRes;
StrRes = getchoice1(); 
value1 = StrRes[0];
value2 = StrRes[1];
l1.setText(value1);
l2.setText(value2);
} 
} 
public void paint(Graphics g){ 
g.drawString("The sendvalue is "+value1+value2,50,100); 
} 
}

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