Validating to ensure user selects an integer.

[lilal111]

I am working on a project and am stuck on something. The project calculates sales commissions from a company. The user inputs the persons first name,last name and then it prompts to collect the amounts of items sold in a variable called input. I am stuck on how to validate to ensure the selection is numeric only. Any help would be greatly appreciated.

Here is the code below:

public void start(){

FirstName=JOptionPane.showInputDialog("Enter sales person First Name :");
LastName=JOptionPane.showInputDialog("Enter sales person Last Name :");
input=JOptionPane.showInputDialog(null, "Enter number of items sold for product" +" "+ productCounter +" :");


while (productCounter <4){
productCounter++;
quantity=Integer.parseInt(input);

if (productCounter==1){
tot1 = quantity * Item1Price;

}else if (productCounter==2){
tot2 =quantity*Item2Price;

} else if (productCounter==3){
tot3 =quantity*Item3Price;

} else if (productCounter==4)
tot4 =quantity*Item4Price;

}//end while

 

[Diancecht]

A way to proceed could be

try {
    quantity=Integer.parseInt(input);
} catch (NumberFormatException nfe) {
       //whatever you want to do to show the error
}

Cheers,
Dian

 

[lilal111]

Where would I institute this code? Would it be possible to place it in the while loop?

Thanks

Al

 

[Diancecht]

I'd put it outside the while loop, as quantity is just evaluated once.

Cheers,
Dian