federico elbl

JApplet Problem - HELP

Hi everybody,
I'm trying to make this calculator program work as an applet AND as an application. I tried using:

in many different ways, but it didn't work. Can sombody help me make it work?
Below is the source code for my calculator program.
Thanks in advance,
-Fede
ps-You can also e-mail me at [email protected]

// calculator
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
public class calcg extends JFrame implements ActionListener
{
private JButton one, two, three, four, five, six, seven,
eight, nine, zero, dec, eq, plus, minus, mult, div, clear;
private JLabel output, spacer;
private Container container;
private String operation;
private double num1, num2, answer;
private boolean clear_flag = false;
//set up GUI
public calcg()
{
//Create Title
super("Calculator");
JPanel container = new JPanel();
container.setLayout( new FlowLayout( FlowLayout.CENTER
) );
output = new JLabel("");
output.setBorder(new MatteBorder(2,2,2,2,Color.gray));
output.setPreferredSize(new Dimension(1,26));
getContentPane().setBackground(Color.white);
getContentPane().add( "North",output );
getContentPane().add( "Center",container );
//set up spacer
spacer = new JLabel( "
" );
container.add( spacer );
//set up clear
clear = new JButton( "CE" );
clear.addActionListener(this);
container.add( clear );
//set up seven and register its event handler
seven = new JButton( "7" );
seven.addActionListener(this);
container.add( seven );
//set up eight
eight = new JButton( "8" );
eight.addActionListener(this);
container.add( eight );
//set up nine
nine = new JButton( "9" );
nine.addActionListener(this);
container.add( nine );
//set up div
div = new JButton( "/" );
div.addActionListener(this);
container.add( div );
//set up four
four = new JButton( "4" );
four.addActionListener(this);
container.add( four );
//set up five
five = new JButton( "5" );
five.addActionListener(this);
container.add( five );
//set up six
six = new JButton( "6" );
six.addActionListener(this);
container.add( six );
//set up mult
mult = new JButton( "*" );
mult.addActionListener(this);
container.add( mult );
//set up one
one = new JButton( "1" );
one.addActionListener(this);
container.add( one );
//set up two
two = new JButton( "2" );
two.addActionListener(this);
container.add( two );
//set up three
three = new JButton( "3" );
three.addActionListener(this);
container.add( three );
//set up minus
minus = new JButton( "-" );
minus.addActionListener(this);
container.add( minus );
//set up zero
zero = new JButton( "0" );
zero.addActionListener(this);
container.add( zero );
//set up dec
dec = new JButton( "." );
dec.addActionListener(this);
container.add( dec );
//set up eq
eq = new JButton( "=" );
eq.addActionListener(this);
container.add( eq );
//set up plus
plus = new JButton( "+" );
plus.addActionListener(this);
container.add( plus );
//Set size and make visible
setSize( 190, 225 );
setVisible( true );
setResizable( false );
}
public void actionPerformed(ActionEvent ae)
{
JButton but = ( JButton )ae.getSource();
//Handle what button was pushed
//Action for dec button
if( but.getText() == "." )
{
//if dec is pressed, first check to make shure there
is not already a decimal
String temp = output.getText();
if( temp.indexOf( '.' ) == -1 )
output.setText( output.getText() + but.getText() );
}
//Action for clear button
else if( but.getText() == "CE" )
{
output.setText( "" );
operation = "";
num1 = 0.0;
num2 = 0.0;
}
//Action for plus button
else if( but.getText() == "+" )
{
operation = "+";
num1 = Double.parseDouble( output.getText() );
clear_flag = true;
//output.setText( "" );
}
//Action for minus button
else if( but.getText() == "-" )
{
operation = "-";
num1 = Double.parseDouble( output.getText() );
clear_flag = true;
//output.setText( "" );
}
//Action for mult button
else if( but.getText() == "*" )
{
operation = "*";
num1 = Double.parseDouble( output.getText() );
clear_flag = true;
//output.setText( "" );
}
//Action for div button
else if( but.getText() == "/" )
{
operation = "/";
num1 = Double.parseDouble( output.getText() );
clear_flag = true;
//output.setText( "" );
}
//Action for eq button
else if( but.getText() == "=" )
{
num2 = Double.parseDouble( output.getText() );
//handle addition
if( operation == "+" )
answer = num1 + num2;
else if( operation == "-" )
answer = num1 - num2;
else if( operation == "*" )
answer = num1 * num2;
else if( operation == "/" )
answer = num1 / num2;
//display answer in output field
output.setText( String.valueOf( answer ) );
clear_flag = true;
operation = "";
}
//Default action should only be used for numbers
else
{
if( clear_flag == true )
{
output.setText( "" );
clear_flag = false;
}
output.setText( output.getText() + but.getText() );
}
}
//execute application
public static void main( String args[] )
{
calcg application = new calcg();
application.setDefaultCloseOperation(
JFrame.EXIT_ON_CLOSE );
}
}

21 years ago

Applets

thanks a lot carl! i made that work, but now the jtextarea is not working. is giving me this error:

/tmp/26198/CircleTest.java:48: cannot resolve symbol
symbol : method showMessageDialog (,javax.swing.JTextArea,int)
location: class javax.swing.JOptionPane
JOptionPane.showMessageDialog( null, output, JOptionPane.INFORMATION_MESSAGE );
^
1 error
and this is the code i have:

import javax.swing.*;
public class CircleTest {
public static void main( String args[] )
{
// strings entered by user
String xinput = JOptionPane.showInputDialog( "Enter value of x:" ),
yinput = JOptionPane.showInputDialog( "Enter value of y:" ),
radiusinput = JOptionPane.showInputDialog( "Enter value of radius:" );
int x, // x-coordinate of Circle's center
y; // y-coordinate of Circle's center
double radius; // Circle's radius
// convert numbers from type String to type int
x = Integer.parseInt( xinput );
y = Integer.parseInt( yinput );
// convert number from type String to type Double
radius = Double.parseDouble( radiusinput );
//create JTextArea to display output
JTextArea output = new JTextArea( );
// Circle's initial x-y coordinates and radius
String result = "X coordinate is " + x +
"\nY coordinate is " + y +
"\nRadius is " + radius;
// Circle's values
result += "\n\nThe new location and radius of circle are\n"+
"Center = [" + x + ", " + y + "]; Radius = " + radius;
// Circle's diameter
result += "\nDiameter is " + 2 * radius + "Radius = " + radius;
// Circle's circunference
result += "\nCircumference is " + (2 * Math.PI * radius);
// Circle's area
result += "\nArea is " + ( Math.PI * radius * radius );
// display results
JOptionPane.showMessageDialog( null, output, JOptionPane.INFORMATION_MESSAGE );
System.exit( 0 );
} // end main
} // end class CircleTest

21 years ago

Thanks a lot. Now is giving me these three errors:

This is how I changed the code:
import javax.swing.*;
public class CircleTest {
public static void main( String args[] )
{
// strings entered by user
String xinput = JOptionPane.showInputDialog( "Enter value of x:" ),
yinput = JOptionPane.showInputDialog( "Enter value of y:" ),
radiusinput = JOptionPane.showInputDialog( "Enter value of radius:" );
int x, // x-coordinate of Circle's center
y; // y-coordinate of Circle's center
double radius; // Circle's radius
// convert numbers from type String to type int
x = Integer.parseInt( xinput );
y = Integer.parseInt( yinput );
// convert number from type String to type Double
radius = Double.parseDouble( radiusinput );
//create JTextArea to display output
JTextArea output = new JTextArea( );
// Circle's initial x-y coordinates and radius
String result = "X coordinate is " + x +
"\nY coordinate is " + y +
"\nRadius is " + radius;
// Circle's values
result += "\n\nThe new location and radius of circle are\n";
"Center = [" + x + ", " + y + "]; Radius = " + radius;
// Circle's diameter
result += "\nDiameter is " + 2 * radius; "Radius = " + radius;
// Circle's circunference
result += "\nCircumference is " + (2 * Math.PI * radius);
// Circle's area
result += "\nArea is " + ( Math.PI * radius * radius );
// display results
JOptionPane.showMessageDialog( null, output, JOptionPane.INFORMATION_MESSAGE );
System.exit( 0 );
} // end main
} // end class CircleTest

21 years ago

Thanks a lot. Now is giving me these three errors:

This is how I changed the code:
import javax.swing.*;
public class CircleTest {
public static void main( String args[] )
{
// strings entered by user
String xinput = JOptionPane.showInputDialog( "Enter value of x:" ),
yinput = JOptionPane.showInputDialog( "Enter value of y:" ),
radiusinput = JOptionPane.showInputDialog( "Enter value of radius:" );
int x, // x-coordinate of Circle's center
y; // y-coordinate of Circle's center
double radius; // Circle's radius
// convert numbers from type String to type int
x = Integer.parseInt( xinput );
y = Integer.parseInt( yinput );
// convert number from type String to type Double
radius = Double.parseDouble( radiusinput );
//create JTextArea to display output
JTextArea output = new JTextArea( );
// Circle's initial x-y coordinates and radius
String result = "X coordinate is " + x +
"\nY coordinate is " + y +
"\nRadius is " + radius;
// Circle's values
result += "\n\nThe new location and radius of circle are\n";
"Center = [" + x + ", " + y + "]; Radius = " + radius;
// Circle's diameter
result += "\nDiameter is " + 2 * radius; "Radius = " + radius;
// Circle's circunference
result += "\nCircumference is " + (2 * Math.PI * radius);
// Circle's area
result += "\nArea is " + ( Math.PI * radius * radius );
// display results
JOptionPane.showMessageDialog( null, output, JOptionPane.INFORMATION_MESSAGE );
System.exit( 0 );
} // end main
} // end class CircleTest

21 years ago

Thanks a lot. Now is giving me these three errors:

This is how I changed the code:
import javax.swing.*;
public class CircleTest {
public static void main( String args[] )
{
// strings entered by user
String xinput = JOptionPane.showInputDialog( "Enter value of x:" ),
yinput = JOptionPane.showInputDialog( "Enter value of y:" ),
radiusinput = JOptionPane.showInputDialog( "Enter value of radius:" );
int x, // x-coordinate of Circle's center
y; // y-coordinate of Circle's center
double radius; // Circle's radius
// convert numbers from type String to type int
x = Integer.parseInt( xinput );
y = Integer.parseInt( yinput );
// convert number from type String to type Double
radius = Double.parseDouble( radiusinput );
//create JTextArea to display output
JTextArea output = new JTextArea( );
// Circle's initial x-y coordinates and radius
String result = "X coordinate is " + x +
"\nY coordinate is " + y +
"\nRadius is " + radius;
// Circle's values
result += "\n\nThe new location and radius of circle are\n";
"Center = [" + x + ", " + y + "]; Radius = " + radius;
// Circle's diameter
result += "\nDiameter is " + 2 * radius; "Radius = " + radius;
// Circle's circunference
result += "\nCircumference is " + (2 * Math.PI * radius);
// Circle's area
result += "\nArea is " + ( Math.PI * radius * radius );
// display results
JOptionPane.showMessageDialog( null, output, JOptionPane.INFORMATION_MESSAGE );
System.exit( 0 );
} // end main
} // end class CircleTest

21 years ago

Hi, I'm new with Java, and I need help with a program that I wrote.
It needs to prompt the user for the x value, the y value, and the radius value, and then display the info in a JTextArea. Is giving me the following error:

I don't know what I'm doing wrong. I would really appreciate your help with this. This is the code i have:

import javax.swing.*;
public class CircleTest {
// strings entered by user
String xinput = JOptionPane.showInputDialog( "Enter value of x:" ),
yinput = JOptionPane.showInputDialog( "Enter value of y:" ),
radiusinput = JOptionPane.showInputDialog( "Enter value of radius:" ),
result;
int x, // x-coordinate of Circle's center
y; // y-coordinate of Circle's center
double radius; // Circle's radius
// convert numbers from type String to type int
x = Integer.parseInt( xinput );
y = Integer.parseInt( yinput );
// convert number from type String to type Double
radius = Double.parseDouble( radiusinput );
//create JTextArea to display output
JTextArea display = new JTextArea( );
// Circle's initial x-y coordinates and radius
result = "X coordinate is " + x +
"\nY coordinate is " + y +
"\nRadius is " + radius;
// String representation of new circle value
result += "\n\nThe new location and radius of circle are\n" +
"Center = [" + x + ", " + y + "]; Radius = " + radius;
// Circle's diameter
result += "\nDiameter is " +
( 2 * radius )"; Radius = " + radius;
// Circle's circumference
result += "\nCircumference is " +
(2 * Math.PI * radius);
// Circle's area
result += "\nArea is " + ( Math.PI * radius * radius );
// display results
JOptionPane.showMessageDialog( null, display, JOptionPane.INFORMATION_MESSAGE );
System.exit( 0 );
} // end main
} // end class CircleTest

Thank you so much.

21 years ago

Hi, I'm new with Java, and I need help with a program that I wrote.
It needs to prompt the user for the x value, the y value, and the radius value, and then display the info in a JTextArea. Is giving me the following error:

I don't know what I'm doing wrong. I would really appreciate your help with this. This is the code i have:

import javax.swing.*;
public class CircleTest {
// strings entered by user
String xinput = JOptionPane.showInputDialog( "Enter value of x:" ),
yinput = JOptionPane.showInputDialog( "Enter value of y:" ),
radiusinput = JOptionPane.showInputDialog( "Enter value of radius:" ),
result;
int x, // x-coordinate of Circle's center
y; // y-coordinate of Circle's center
double radius; // Circle's radius
// convert numbers from type String to type int
x = Integer.parseInt( xinput );
y = Integer.parseInt( yinput );
// convert number from type String to type Double
radius = Double.parseDouble( radiusinput );
//create JTextArea to display output
JTextArea display = new JTextArea( );
// Circle's initial x-y coordinates and radius
result = "X coordinate is " + x +
"\nY coordinate is " + y +
"\nRadius is " + radius;
// String representation of new circle value
result += "\n\nThe new location and radius of circle are\n" +
"Center = [" + x + ", " + y + "]; Radius = " + radius;
// Circle's diameter
result += "\nDiameter is " +
( 2 * radius )"; Radius = " + radius;
// Circle's circumference
result += "\nCircumference is " +
(2 * Math.PI * radius);
// Circle's area
result += "\nArea is " + ( Math.PI * radius * radius );
// display results
JOptionPane.showMessageDialog( null, display, JOptionPane.INFORMATION_MESSAGE );
System.exit( 0 );
} // end main
} // end class CircleTest

Thank you so much.

21 years ago

Hi, I'm new with Java, and I need help with a program that I wrote.
It needs to prompt the user for the x value, the y value, and the radius value, and then display the info in a JTextArea. Is giving me the following error:

I don't know what I'm doing wrong. I would really appreciate your help with this. This is the code i have:

import javax.swing.*;
public class CircleTest {
// strings entered by user
String xinput = JOptionPane.showInputDialog( "Enter value of x:" ),
yinput = JOptionPane.showInputDialog( "Enter value of y:" ),
radiusinput = JOptionPane.showInputDialog( "Enter value of radius:" ),
result;
int x, // x-coordinate of Circle's center
y; // y-coordinate of Circle's center
double radius; // Circle's radius
// convert numbers from type String to type int
x = Integer.parseInt( xinput );
y = Integer.parseInt( yinput );
// convert number from type String to type Double
radius = Double.parseDouble( radiusinput );
//create JTextArea to display output
JTextArea display = new JTextArea( );
// Circle's initial x-y coordinates and radius
result = "X coordinate is " + x +
"\nY coordinate is " + y +
"\nRadius is " + radius;
// String representation of new circle value
result += "\n\nThe new location and radius of circle are\n" +
"Center = [" + x + ", " + y + "]; Radius = " + radius;
// Circle's diameter
result += "\nDiameter is " +
( 2 * radius )"; Radius = " + radius;
// Circle's circumference
result += "\nCircumference is " +
(2 * Math.PI * radius);
// Circle's area
result += "\nArea is " + ( Math.PI * radius * radius );
// display results
JOptionPane.showMessageDialog( null, display, JOptionPane.INFORMATION_MESSAGE );
System.exit( 0 );
} // end main
} // end class CircleTest

Thank you so much.

21 years ago

Hi, I'm new with Java, and I need help with a program that I wrote.
It needs to prompt the user for the x value, the y value, and the radius value, and then display the info in a JTextArea. Is giving me the following error:

I don't know what I'm doing wrong. I would really appreciate your help with this. This is the code i have:

import javax.swing.*;
public class CircleTest {
// strings entered by user
String xinput = JOptionPane.showInputDialog( "Enter value of x:" ),
yinput = JOptionPane.showInputDialog( "Enter value of y:" ),
radiusinput = JOptionPane.showInputDialog( "Enter value of radius:" ),
result;
int x, // x-coordinate of Circle's center
y; // y-coordinate of Circle's center
double radius; // Circle's radius
// convert numbers from type String to type int
x = Integer.parseInt( xinput );
y = Integer.parseInt( yinput );
// convert number from type String to type Double
radius = Double.parseDouble( radiusinput );
//create JTextArea to display output
JTextArea display = new JTextArea( );
// Circle's initial x-y coordinates and radius
result = "X coordinate is " + x +
"\nY coordinate is " + y +
"\nRadius is " + radius;
// String representation of new circle value
result += "\n\nThe new location and radius of circle are\n" +
"Center = [" + x + ", " + y + "]; Radius = " + radius;
// Circle's diameter
result += "\nDiameter is " +
( 2 * radius )"; Radius = " + radius;
// Circle's circumference
result += "\nCircumference is " +
(2 * Math.PI * radius);
// Circle's area
result += "\nArea is " + ( Math.PI * radius * radius );
// display results
JOptionPane.showMessageDialog( null, display, JOptionPane.INFORMATION_MESSAGE );
System.exit( 0 );
} // end main
} // end class CircleTest

Thanks a lot

21 years ago

help with game

could somebody give me a detailed explanation of how this tictactoe game program works?
thanks you. this is the code:
import javax.swing.*;
import java.awt.*;
import java.applet.*;
public class TicTac extends JApplet
{
public void init()
{
// declaration aand created array
int Array[] = new int[8];
String input1;
String input2;
int choice1 = 0;
int choice2;
for(int i=0; i < Array.length; i++) Array = 0;
while (choice1 == 0)
{
input1 = JOptionPane.showInputDialog
("Please select your symbol\n"+
"1= O \n"+
"2= X \n");
if (input1.equals("1")) choice1 = 1;
if (input1.equals("2")) choice1 = 2;
}
//converts string to integer
//choice1 = Integer.parseInt( input1 );
}
// draws the TicTacToe Board...
public void paint(Graphics g)
{
Dimension d = getSize();
g.setColor(Color.blue);
int sz = 0;
if (d.height/4 - 10 < d.width/4) sz = d.height / 4;
elsesz = d.width / 4;
for (int j=0; j < 4; j++)
{
g.drawLine(10,sz*j+10,sz*3+10,sz*j+10);
g.drawLine(j*sz+10,10,j*sz+10,sz*3+10);
}
g.setColor(Color.black);
g.drawRect(9,9,sz*3+2,sz*3+2);
} //end of paitn method
}// end of class

21 years ago

copying arrays - please h e l p!

Hi, I'm new with Java, and I need help with an assigment about copying arrays, I was wondering if anyone could help me out.
I need to design a program that asks user to enter name and then displays it dysplaying the index and value, like:

I would really appreciate your help. You can reply here or e-mail me at [email protected]
Thanks in advance,
Federico
[ October 14, 2003: Message edited by: federico elbl ]

21 years ago