How to select the Time slot...

[rahulroy08]

Hi,

I'm working on a Java project, Which is to design an appointment scheduling software.

In my code,I have a TimeSlot class which gives the user the option to select the date and time.

But once the user selects a particular time slot for a particular day,then that must be removed from the list.

Can someone help me how to implement this,
Here is the code that creates a the frame for the TimeSlot,

<code>

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

class TimeSlot1 extends Frame
{
Choice day,time;
Label l1,l2;
Button submit,cancel;

TimeSlot1()
{
setLayout(null);
setTitle("TimeSlot");

submit=new Button("Submit");
cancel=new Button("Cancel");
submit.setBounds(500,500,150,50);
cancel.setBounds(700,500,150,50);


l1=new Label("Day");
l2=new Label("Time");

l1.setBounds(150,200,50,25);
day=new Choice();
day.setBounds(200,200,100,25);

time=new Choice();
l2.setBounds(150,250,50,25);
time.setBounds(200,250,100,25);

add(day);
add(time);
add(submit);
add(cancel);

add(l1);
add(l2);

day.add(" ");
day.add("Monday");
day.add("Tuesday");
day.add("Wednesday");
day.add("Thursday");
day.add("Friday");

time.add(" ");
time.add("8.00 am");
time.add("8.15 am");
time.add("8.30 am");
time.add("8.45 am");
time.add("9.00 am");
time.add("9.15 am");
time.add("9.30 am");
time.add("9.45 am");
time.add("10.00 am");
time.add("10.15 am");
time.add("10.30 am");
time.add("10.45 am");
time.add("11.00 am");
time.add("11.15 am");
time.add("11.30 am");
time.add("11.45 am");
time.add("12.00 pm");
time.add("12.15 pm");
time.add("12.30 pm");
time.add("12.45 pm");
time.add("1.00 pm");
time.add("1.15 pm");
time.add("1.30 pm");
time.add("1.45 pm");
time.add("2.00 pm");
time.add("2.15 pm");
time.add("2.30 pm");
time.add("2.45 pm");
time.add("3.00 pm");
time.add("3.15 pm");
time.add("3.30 pm");
time.add("3.45 pm");
time.add("4.00 pm");
time.add("4.15 pm");

}

public static void main(String args[])
{
TimeSlot1 ts=new TimeSlot1();
Toolkit tk=Toolkit.getDefaultToolkit();
ts.setSize(tk.getScreenSize());
ts.setVisible(true);

}

}

</code>

Thanks,

Uday

 

[Bong]

The problem is that you have 2 choices: day and time. When the user selects a timeslot for a given day, you don't want to remove it from the other days. I think the best way to do this is to have a 2-D array so that the available time/day choices are listed in the array. Then, the choices can be built from the array. First the user chooses a day, then the time choices are built from the current state of the array. Then when the user chooses a time, that element is removed from the array.

_________________
Bob Rashkin

 

[rahulroy08]

Hi Bob,

Thanks for your reply. I could understand what you said, but was unable to figure out how to implement it. Can you please send me a small piece of code how to implement it. It would be really great thanks.


Uday

 

[Bong]

Let's say you have an array:
static String tSlots[][];
You instantiate this array with all the time slots, where Monday - Friday correspond to first index 1-5, and second index 1-33 correspond to the time slots (8am - 4:15pm, every 15 minutes). So, for example, tSlots[4]= "8:45 am", for all i.
Now you can instantiate the "day" choice as before, but you want to add an ItemListener, whose action is to populate the "time" choice:
day.addItemListener(new ItemListener(){
int dIndex = day.getSelectedIndex();
for {int i=1; i<34; i++} {
if {tSlots[dIndex]!=null {
time.add(tSlots[dIndex];
}
}
}

You also put in an ItemListener on "time" so that when the user chooses a time slot, you capture the selected index (as above) and use it to make the corresponding entry in tSlots null.

_________________
Bob Rashkin

 

[Bong]

I left out the ItemStateChanged event:
day.addItemListener(new ItemListener(){
int dIndex = day.getSelectedIndex();
for {int i=1; i<34; i++} {
if {tSlots[dIndex]!=null {
time.add(tSlots[dIndex];
}
}
}
should be

day.addItemListener(new ItemListener(){
 [i]public void itemStateChanged(ItemEvent e) {[/i]
  int dIndex = day.getSelectedIndex();
  for {int i=1; i<34; i++} {
   if {tSlots[dIndex][i]!=null {
     time.add(tSlots[dIndex][i];
   }
  }
 [i]}[/i]
}

_________________
Bob Rashkin

 

[rahulroy08]

Hi Bob,
Thanks for your code. I have tried it but it does not populate my time list.

Also I need some help closing the frame once I submit. My project navigates between 3 frames. But I want to close the desired frame.

Here is the code for the TimeSlot Class


<code>


class TimeSlot2 extends Frame implements ItemListener
{
Choice day,time;
Label l1,l2;

Button submit,cancel;
static String tSlots[][];

TimeSlot2()
{
setLayout(null);
setTitle("TimeSlot");

submit=new Button("Submit");
cancel=new Button("Cancel");
submit.setBounds(500,500,150,50);
cancel.setBounds(700,500,150,50);


l1=new Label("Day");
l2=new Label("Time");

l1.setBounds(150,200,50,25);
day=new Choice();
day.setBounds(200,200,100,25);



time=new Choice();
l2.setBounds(150,250,50,25);
time.setBounds(200,250,100,25);

add(day);
add(time);
add(submit);
add(cancel);

add(l1);
add(l2);

day.add(" ");
day.add("Monday");
day.add("Tuesday");
day.add("Wednesday");
day.add("Thursday");
day.add("Friday");

day.addItemListener(this);

time.add(" ");

}



public void itemStateChanged(ItemEvent e)
{
int dIndex = day.getSelectedIndex();

for(int i=1; i<34; i++)
{
if (tSlots[dIndex]!=null)
{
time.add(tSlots[dIndex]);
}
}
}






public static void main(String args[])
{
TimeSlot2 ts=new TimeSlot2();
Toolkit tk=Toolkit.getDefaultToolkit();
ts.setSize(tk.getScreenSize());
ts.setVisible(true);

}



}

</code>

When I execute it, it gives me a null pointer exception....

Please help me in this regards,

Thanks,

Uday