Java beginners problem

Derekmcauley7

Hi, so If started learning java and I was messing around with two classes, trying to create a dialog box in one class and call it up in the other. Can anyone tell me whats wrong with the below?? Your help would be really appreciated.

below is the first class

import javax.swing.JOptionPane;
import java.util.Scanner;
public class dominos {
public static void message(){
System.out.println("Enter your name:");
Scanner imput = new Scanner(System.in);
String name = imput.nextLine();
JOptionPane.showMessageDialog(null, "welcome", name, JOptionPane.INFORMATION_MESSAGE);
}
}

below is the second class

public class earl {
public static void main(String agrs[]){
dominos domObject = new dominos();
domObject.message();

}
}

mad turnip

what exactly is wrong?

As it looks like it should be giving no compile errors.

Derekmcauley7

Hey, its not giving a compiler error message. The dialog box (JOptionPane.showMessageDialog(null, "welcome", name, JOptionPane.INFORMATION_MESSAGE); ) is not appearing.

SilverScreen

The Dominos class needs to extend JFrame in order to use JOptionPane, it cannot be used on it's own

If you want to just print out the entered name to th console use System.out.println("Welcome " + name);

mad turnip

it appears you need a component to display the error message on, no idea why but this code works:

import javax.swing.JOptionPane;

import java.awt.Frame;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		System.out.println("Enter your name:");
		Scanner imput = new Scanner(System.in);
		String name = imput.nextLine();
		System.out.println(name);
		Frame f = new Frame();
		f.show();
		JOptionPane.showMessageDialog(f, "welcome", name,
				JOptionPane.INFORMATION_MESSAGE);
	}
}

Derekmcauley7

Hi, I was trying to do this but get the user to imput the name. I also wanted to try call it from one class to another.

import java.awt.Frame;
import java.util.Scanner;
import javax.swing.JOptionPane;

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

JOptionPane.showMessageDialog(null, "welcome", "Derek",
JOptionPane.INFORMATION_MESSAGE);
}
}

counterpointaud

Are you sure the JOptionPane is not there ? Maybe it is just hidden ?

Have you tried running it, entering name in console, pressing enter, and then hitting alt + tab to check this ? I think if you want JOPtionPane to always be on top of all other windows, then you need to use a JFrame or other parent component reference as the first parameter, not null, as others have mentioned.

Generally you don't mix console and JOptionPane i/o in the way you are doing, maybe consider having the user input on a JDialogBox or something, rather than using the console.

SilverScreen

public class domino extends JFrame {

That's all that's needed for it to work.

mad turnip

Zero1986 wrote: »

public class domino extends JFrame {

That's all that's needed for it to work.

I tried your solution it didn't work for me in the latest java 6 I believe.

SilverScreen

mad turnip wrote: »

I tried your solution it didn't work for me in the latest java 6 I believe.

This is the exact code I tried and it worked for me no problem, I haven't updated my Java in a while though.

[B]First class[/B]

import javax.swing.JOptionPane;
import javax.swing.JFrame;
import java.util.Scanner;

public class dominos extends JFrame {
     public void message(){
          System.out.println("Enter your name:");
          Scanner imput = new Scanner(System.in);
          String name = imput.nextLine();
          JOptionPane.showMessageDialog(null, "welcome" + name, null, JOptionPane.INFORMATION_MESSAGE);
     }
}


[B]Second class[/B]

public class earl {
     public static void main(String agrs[]){
          dominos domObject = new dominos();
          domObject.message();
     }
}

mad turnip

Zero1986 wrote: »

This is the exact code I tried and it worked for me no problem, I haven't updated my Java in a while though.

[B]First class[/B]

import javax.swing.JOptionPane;
import javax.swing.JFrame;
import java.util.Scanner;

public class dominos extends JFrame {
     public void message(){
          System.out.println("Enter your name:");
          Scanner imput = new Scanner(System.in);
          String name = imput.nextLine();
          JOptionPane.showMessageDialog(null, "welcome" + name, null, JOptionPane.INFORMATION_MESSAGE);
     }
}


[B]Second class[/B]

public class earl {
     public static void main(String agrs[]){
          dominos domObject = new dominos();
          domObject.message();
     }
}

Did you run this through eclipse by any chance?

Derekmcauley7

mad turnip wrote: »

Did you run this through eclipse by any chance?

Yeah that worked. Thanks :-D