exception.java

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package vacationprice;
 import java.io.IOException;
import java.lang.Throwable;
import javax.swing.*;
import javax.swing.text.JTextComponent;
import java.util.Scanner;
/**
 *
 * @author j
 */
public class exception {

public static boolean isPresent(JTextComponent c, String title)
{
    if (c.getText().length() == 0)
    {
        showMessage(c, title + "is a required field.\n"
                + " Please re-enter.");
        c.requestFocusInWindow();
        return false;

    }
    return true;
}


public static boolean isInteger(JTextComponent c, String title)
{
    try
    {
        int i = Integer.parseInt(c.getText());
        return true;
}

    catch (NumberFormatException e)
    {
         showMessage(c, title + "Should be an integer.\n"
                + " Please re-enter.");
        c.requestFocusInWindow();
        return false;
    }
}

   private static void showMessage(JTextComponent c, String message)
    {
        JOptionPane.showMessageDialog(c, message, "Invalid entry",
              JOptionPane.ERROR_MESSAGE);
    }










}