I need help from the experts...

[delosoa]

Can you help me with this??
The total will be displayed only when the user type -1.
And it will continue looping if you will not type -1.
And it will also continue to add the total(that will be displayed only if you type -1).

import javax.swing.JOptionPane;
import java.text.DecimalFormat;

public class Commission3{
public static void main(String args[]) {

String name, item, ans;
int choice=0, cnt=0,m1=2.93,m2=4.50,m3= 9.98,m4=4.49,m5=6.87;
int total=0,count=1, Quantity=0,z=0;

DecimalFormat twoDigits = new DecimalFormat("0.00");

while (choice!=-1) {

item=JOptionPane.showInputDialog("Product No. Retal Price\n"+
"\nProduct 1 $ 2.93"+
"\nProduct 2 $ 4.50"+
"\nProduct 3 $ 9.98"+
"\nProduct 4 $ 4.49"+
"\nProduct 5 $ 6.87"+
"\n\n Type -1 to show the Final Result"+
"\nEnter Product Number");

JOptionPane.showInputDialog("Quantity Sold fo the Product");

choice=Integer.parseInt(item);

switch(choice)
{

case 1:
z=m1*Quantity;
total += z;
count++;
break;

case 2:

z=m2*Quantity;
total += z;
count++;

break;

case 3:

z=m3*Quantity;
total += z;
count++;

break;

case 4:

z=m4*Quantity;
total += z;
count++;

case 5:

z=m5*Quantity;
total += z;
count++;
break;

}
total += z;
count++;
JOptionPane.showMessageDialog(null,"The total Retail Price is "+total,"RESULT",
JOptionPane.INFORMATION_MESSAGE);
}

if(choice==-1){

total +=choice;
count++;
JOptionPane.showMessageDialog(null,"The total Retail Price is "+total,"RESULT",
JOptionPane.INFORMATION_MESSAGE);
}

System.exit(0);

}

}

[javaAddict]

case 5:
    z=m5*Quantity;
    total += z;
    count++;
    break;
  }
  total += z;
  count++;
  JOptionPane.showMessageDialog(null,"The total Retail Price is "+total,"RESULT",
  JOptionPane.INFORMATION_MESSAGE);
}
  if(choice==-1){
  total +=choice;
  count++;
  JOptionPane.showMessageDialog(null,"The total Retail Price is "+total,"RESULT",
  JOptionPane.INFORMATION_MESSAGE);
}

First red: why do you add the total again, when you have already added it inside the switch.(You don't need count either).
Second red: why do you add the 'choice' to the total. You already have the total calculated inside the while() { }. choice has the value of -1, so you are adding -1 to the total?!?!