showMessageDialog() function gives an error

[BernieLomaxxx]

hello very new to processing, this code is from the book Processing: An Introduction to Programming

when I use showMessageDialog after using JOptionPane i get an error saying "frame cannot be resolved to a variable"

import static javax.swing.JOptionPane.*;
String input;
input=showInputDialog("Enter an integer to be squared: ");

int integer;
integer = int(input);

int square;
square = integer*integer;

showMessageDialog(frame,integer+" squared is " + square);

[glv]

Hello,

Here is a working example that replaced frame with null:

Open console instead of window

Hello, There is always javax.swing.JOptionPane for simple IO: import javax.swing.JOptionPane; int col; void setup() { } void draw() { background(col); } void keyPressed() { thread("MessageDialog_thread"); } void MessageDialog_thread() { String strInp = JOptionPane.showInputDialog(null,"Enter a color 0 to 255:"); col = int(strInp); JOptionPane.showMessageDialog(null, col, "Output", JOptionPane.PLAIN_MESSAGE); }

Adding this to your code will also work:

    import javax.swing.JFrame;
    JFrame frame = new JFrame("JOptionPane showMessageDialog example");

Insight gleaned from here:
Java: JOptionPane showMessageDialog examples (part 1) | alvinalexander.com

:)

[BernieLomaxxx]

Thank you glv, hopefully one day I’ll understand WHY that worked, lol, baby steps!

[svan]

@glv

import javax.swing.JFrame;
    JFrame frame = new JFrame("JOptionPane showMessageDialog example");

Hopefully you also checked that input != null just in case someone hits the ‘Cancel’ button and a null pointer exception is raised.