Question

How do I fix the "error: bad operand types for binary operator '*' " in my code?

What I am trying to do:

double TotalPrice = TicketPrice * NoOfTickets;      

My code:

import javax.swing.*;

/*provides interfaces and classes for different events by AWT components*/
import java.awt.event.*;

import javax.swing.JOptionPane;

//TicketReservation.java
class TicketReservation

{

public static void main(String args[])

{

/*Declare JFrame for place controls.*/
JFrame f= new JFrame("Movie Ticket Reservation");                                  

/*Declare JLabels*/

JLabel MovieTitle, NoOfTickets, ShowTime, TicketPrice;                  

/*Declare JTextFields*/

JTextField txtMovieTitle, txtNoOfTickets, txtShowTime, txtTicketPrice;              

/*Declare JButton "Reserve*/

JButton Reserve =new JButton("Reserve");      

/*Declare JTextArea*/                                  

JTextArea txtaReserve;                                                              

/*Creating JLabel object "MovieTitle"*/
MovieTitle = new JLabel("Movie Title:");                                          

MovieTitle.setBounds(20,50, 200,30);

/*Creating JLabel object NoOfTickets*/
NoOfTickets = new JLabel("Number of Tickets:");

/*X, Y, Widht, Hight of control*/

NoOfTickets.setBounds(20,100, 200,30);                                      

/*Creating JLabel object "ShowTime*/
ShowTime = new JLabel("Show Time:");

ShowTime.setBounds(20,150, 200,30);

/*Creating JLabel object TicketPrice*/
TicketPrice=new JLabel("Ticket Price:");

TicketPrice.setBounds(20,200, 200,30);

/*constructing text area*/
txtaReserve = new JTextArea();

txtaReserve.setBounds(20,300, 400,150);

/*creating text field objects*/
txtMovieTitle = new JTextField();
txtMovieTitle.setBounds(200,50, 200,30);

txtNoOfTickets = new JTextField("");
txtNoOfTickets.setBounds(200,100, 200,30);

txtShowTime = new JTextField("");
txtShowTime.setBounds(200,150, 200,30);

txtTicketPrice = new JTextField("");
txtTicketPrice.setBounds(200,200, 200,30);

Reserve.setBounds(100,450,100,30);

/*Adding controls into JFrame*/

f.add(MovieTitle);                                                              

f.add(NoOfTickets);

f.add(ShowTime);

f.add(TicketPrice);

f.add(txtaReserve);

f.add(txtMovieTitle);

f.add(txtNoOfTickets);

f.add(txtShowTime);

f.add(txtTicketPrice);

f.add(Reserve);

//*Set JFrame size and properties*/

f.setSize(500,600);                                                                  

f.setLayout(null);

f.setVisible(true);

/*Used action lister to calculate and display result
in text area, when user click Reserve button.*/

Reserve.addActionListener(new ActionListener(){                                      
public void actionPerformed(ActionEvent e){

try
{

/*Get the input from text fields*/
String MovieTitle = txtMovieTitle.getText();                                  

int NoOfTickets = Integer.parseInt(txtNoOfTickets.getText());

String ShowTime = txtShowTime.getText();

double TicketPrice = Double.parseDouble(txtTicketPrice.getText());

}

catch (Exception exe) {

JOptionPane.showMessageDialog(null, "Error: Invalid input", "Error", JOptionPane.ERROR_MESSAGE);
return;

}
                                  
/*Calculate TotalPrice*/
double TotalPrice = TicketPrice * NoOfTickets;      

/*Output string*/
String str = "Movie Title: " + MovieTitle + "\nNumber of Tickets: " + NoOfTickets + "\nShowTime: " + ShowTime + "\nTicket Price: " + TicketPrice + "\n Total Price of Reservation: "+TotalPrice;

/*Set the output into textarea*/
txtaReserve.setText(str);                                                      

}

});

}

}

Answer 1

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;

//TicketReservation.java
class TicketReservation

{

        public static void main(String args[])

        {

                /* Declare JFrame for place controls. */
                JFrame f = new JFrame("Movie Ticket Reservation");

                /* Declare JLabels */

                JLabel MovieTitle, NoOfTickets, ShowTime, TicketPrice;

                /* Declare JTextFields */

                JTextField txtMovieTitle, txtNoOfTickets, txtShowTime, txtTicketPrice;

                /* Declare JButton "Reserve */

                JButton Reserve = new JButton("Reserve");

                /* Declare JTextArea */

                JTextArea txtaReserve;

                /* Creating JLabel object "MovieTitle" */
                MovieTitle = new JLabel("Movie Title:");

                MovieTitle.setBounds(20, 50, 200, 30);

                /* Creating JLabel object NoOfTickets */
                NoOfTickets = new JLabel("Number of Tickets:");

                /* X, Y, Widht, Hight of control */

                NoOfTickets.setBounds(20, 100, 200, 30);

                /* Creating JLabel object "ShowTime */
                ShowTime = new JLabel("Show Time:");

                ShowTime.setBounds(20, 150, 200, 30);

                /* Creating JLabel object TicketPrice */
                TicketPrice = new JLabel("Ticket Price:");

                TicketPrice.setBounds(20, 200, 200, 30);

                /* constructing text area */
                txtaReserve = new JTextArea();

                txtaReserve.setBounds(20, 300, 400, 150);

                /* creating text field objects */
                txtMovieTitle = new JTextField();
                txtMovieTitle.setBounds(200, 50, 200, 30);

                txtNoOfTickets = new JTextField("");
                txtNoOfTickets.setBounds(200, 100, 200, 30);

                txtShowTime = new JTextField("");
                txtShowTime.setBounds(200, 150, 200, 30);

                txtTicketPrice = new JTextField("");
                txtTicketPrice.setBounds(200, 200, 200, 30);

                Reserve.setBounds(100, 450, 100, 30);

                /* Adding controls into JFrame */

                f.add(MovieTitle);

                f.add(NoOfTickets);

                f.add(ShowTime);

                f.add(TicketPrice);

                f.add(txtaReserve);

                f.add(txtMovieTitle);

                f.add(txtNoOfTickets);

                f.add(txtShowTime);

                f.add(txtTicketPrice);

                f.add(Reserve);

//*Set JFrame size and properties*/

                f.setSize(500, 600);

                f.setLayout(null);

                f.setVisible(true);

                /*
                 * Used action lister to calculate and display result in text area, when user
                 * click Reserve button.
                 */

                Reserve.addActionListener(new ActionListener() {
                        public void actionPerformed(ActionEvent e) {

                                try {

                                        /* Get the input from text fields */
                                        String MovieTitle = txtMovieTitle.getText();

                                        int NoOfTickets = Integer.parseInt(txtNoOfTickets.getText());

                                        String ShowTime = txtShowTime.getText();

                                        double TicketPrice = Double.parseDouble(txtTicketPrice.getText());
                                        double TotalPrice =  TicketPrice * NoOfTickets;
                                        /* Output string */
                                        String str = "Movie Title: " + MovieTitle + "\nNumber of Tickets: " + NoOfTickets + "\nShowTime: "
                                                        + ShowTime + "\nTicket Price: " + TicketPrice + "\n Total Price of Reservation: " + TotalPrice;

                                        /* Set the output into textarea */
                                        txtaReserve.setText(str);

                                }

                                catch (Exception exe) {

                                        JOptionPane.showMessageDialog(null, "Error: Invalid input", "Error", JOptionPane.ERROR_MESSAGE);
                                        return;

                                }

                                /* Calculate TotalPrice */
                        
                                

                        }

                });

        }
}

NOTE : PLEASE COMMENT BELOW IF YOU HAVE CONCERNS.

I AM HERE TO HELP YOUIF YOU LIKE MY ANSWER PLEASE RATE AND HELP ME IT IS VERY IMP FOR ME