Error Checking for user input

[guessvic]

Hello all, is that possible to help me out with Error Checking for user input? I am developing a peg solitaire program and now need a error checking for user input or for input file.

Either use try and catch.. or making another method.. can anyone give a me a hint or help me out here please.

Regards

[Easter Bunny]

what kind of error checking? like when the user tries to put a king on a 7? you can use a method to check that and if the user is being a moron, then you can display a joptionpane or you can throw one of your own exceptions which will have to be dealt with. something like InvalidMoveException.

[server_crash]

For something like that I would say some if else statements would work. Like:

if (!card slot is already taken)
{
      //do something
}
else
{
    //do something else
}

Of course it would be cool to experiment making your own exception as EB said.

[guessvic]

Thanks for all replies. I just got it working with try and catch exception, my problem was I use try {}catch (IOException e) {} instead of just use catch (Exception e) {}

The input only reads: From To
Exception prevent any invalid input such as "jslkfjsdlkfjlkd".

[geerthan08]

import javax.swing.*;

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

String username;
int i;
String password;
int j;

String[]uname={"geerthan"};
String[]pwd={"19881108"};
password.setEchoChar('*');

boolean loop=true;
while(loop){
username=JOptionPane.showInputDialog("Enter the Username");
if(username.equals("")){
String message="Please Enter the Username";
JOptionPane.showMessageDialog(new JFrame(),message,"Warning",JOptionPane.WARNING_MESSAGE);
}
else
{
password=JOptionPane.showInputDialog("Enter the Password");
if(password.equals("")){
String message="Please Enter the Password";
JOptionPane.showMessageDialog(new JFrame(),message,"WARNING",JOptionPane.WARNING_MESSAGE);
}
else
{

for(i=0;i