Thread: Joptionpanel. i need help here.

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This is the code i do, but got some problem there.

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
 
package javaapplication1;
import java.util.Scanner;
import javax.swing.JOptionPane;
 /**
  *
 * @author student
 */
public class Main {
 
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        double price1=29.0;
        double price2=39.0;
        double price3=49.0;
        double total=0.0;
        int item=0;
        Scanner input = new Scanner (System.in);
        int counter = 0;
        int select;
        do{
            System.out.print("Enter ther selection: ");
            select = Input.nextint();
          if (select==1);
            total=total+price1
            else if(select == 2);
            total=total+price2
            else if(select == 3);
            total=total+price3
             else if (select==0)
            break;
            Counter++;
            item++
            System.out.println("You have selected" + item + "item with "
                    while(counter<4);
            system.out.println(String.format("%3", total) )
 
        }

got some problem there.

Please explain.

item++
System.out.println("You have selected" + item + "item with "
while(counter<4);
system.out.println(String.format("%3", total) )


You have no ; after item++


Your second line doesn't have an ending );

You need to capitalize System.


Also, your ; is what is being executed after your if statements. You should get rid of that ;. You don't need it right after an if. You need a bracket to end your do....while loop but you don't have one.


You do need a ; after statements like

total=total+price1


Java is case-sensitive when it comes to variable names so it won't like it if you name your Scanner object input and then put this:

select = Input.nextint();

Also, the Scanner method is called nextInt(), not nextint().


----------Update-------------
I think I see what you're wanting to do.

You want to use JOptionPane instead of Scanner.

Your JOptionPane method returns a String.

The Integer class has a static method called parseInt(String) that parses a String and converts it, if possible, to an int and returns that int.

Prompt the user to choose an product using the number (1,2,3) that
corresponds to the item, or to enter 0 to quit the application. After the user
makes the first selection, if the choice is 0, display a bill of RM0. Otherwise,
display the menu again.
o Use other store for example: restaurant, boutique or fruit stalls with
different product and prices.
o *minimum 3 products as the selections
The last question is like this:
The user should respond to this prompt with another item number to order or 0
to quit. If the user types 0, display the cost of the single request item. If the
user types 1, 2, or 3 add the cost of the second item to the first, and then
display the menu a third time. If the user types 0 to quit, display the total cost
of the two items; otherwise, display the total for all three selections and the
total item purchased. The user is only allowed to make a maximum of 3 menu
selections.

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
 
package javaapplication1;
import java.util.Scanner;
import javax.swing.JOptionPane;
 /**
  *
 * @author student
 */
public class Main {
 
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        double price1=29.0;
        double price2=39.0;
        double price3=49.0;
        double total=0.0;
        int item=0;
        Scanner input = new Scanner (System.in);
        int counter = 0;
        int select;
        do{
         user_value = JOptionPane.showInputDialog("Enter temperature: ");
         value = Integer.parseInt(user_value);
 
          if (select==1);
            total=total+price1;
            else if(select == 2);
            total=total+price2;
            else if(select == 3);
            total=total+price3;
             else if (select==0)
            break;
            Counter++;
            item++;
            System.out.println("You have selected" + item + "item with "
                    while(counter<4);
            system.out.println(String.format("%3", total) )
JOptionPane.showMessageDialog (
null, "You have selected" + item + "item with "(String.format("%3", total) ),
JOptionPane.PLAIN_MESSAGE);
System.exit ( 0 ); 
 
        }
 
        }

You need to ask specific questions about the problems you are having.

Be sure to use code tags NOT quote tags

If there are any compiler errors, please copy the full text of the error message and paste it here.

for the question,
1. Prompt the user to choose an product using the number (1,2,3) that
corresponds to the item, or to enter 0 to quit the application. After the user
makes the first selection, if the choice is 0, display a bill of RM0. Otherwise,
display the menu again.
o Use other store for example: restaurant, boutique or fruit stalls with
different product and prices.
o *minimum 3 products as the selections



2.The user should respond to this prompt with another item number to order or 0
to quit. If the user types 0, display the cost of the single request item. If the
user types 1, 2, or 3 add the cost of the second item to the first, and then
display the menu a third time. If the user types 0 to quit, display the total cost
of the two items; otherwise, display the total for all three selections and the
total item purchased. The user is only allowed to make a maximum of 3 menu
selections.
Come out this,

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package javaapplication10;
import java.util.Scanner;
import javax.swing.JOptionPane;
/**
 *
 * @author Jason_PC
 */
/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
 
public class JavaApplication10 {
 
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        double price1=29.0;
        double price2=39.0;
        double price3=49.0;
        double total=0.0;
        int item=0;
        Scanner input = new Scanner (System.in);
        int counter = 0;
        int select;
        do{
            System.out.print("Enter ther selection: ");
            select = Input.pase
          if (select==1);
            total=total+price1
            else if(select == 2);
            total=total+price2
            else if(select == 3);
            total=total+price3
             else if (select==0)
            break;
            Counter++;
            item++
            JOptionPane.showOptionDialog("You have selected" + item + "item with "
                    while(counter<4);
            JOptionPane.showOptionDialog(String.format("%3", total) )
 
        }
 
        }

With have this error warning.
run:
java.lang.ClassFormatError: Duplicate field name&signature in class file javaapplication10/JavaApplication10
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java :792)
at java.security.SecureClassLoader.defineClass(Secure ClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader .java:449)
at java.net.URLClassLoader.access$100(URLClassLoader. java:71)
at java.net.URLClassLoader$1.run(URLClassLoader.java: 361)
at java.net.URLClassLoader$1.run(URLClassLoader.java: 355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.j ava:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:4 24)
at sun.misc.Launcher$AppClassLoader.loadClass(Launche r.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:3 57)
at sun.launcher.LauncherHelper.checkAndLoadMain(Launc herHelper.java:482)
Exception in thread "main" Java Result: 1
BUILD SUCCESSFUL (total time: 2 seconds)

Can anyone help me.

I don't know what the error you posted means. I've never seen one like it.

The posted code does not compile without many errors. You need to copy the full text of the compiler's error messages and paste it here.

The javac compiler comes in the JDK that is a free download from the Oracle site.
Do a Search for JDK Download and the search engine will give you the URL where the JDK can be downloaded.

run:
java.lang.ClassFormatError: Duplicate field name&signature in class file

How did you get that error message? What program did you execute?