Computer Science Canada

I need a little help for ready to program java? My program will not compile? Want to help please?
Author:  219 [ Sat Jun 18, 2011 8:00 pm ]
Post subject:  I need a little help for ready to program java? My program will not compile? Want to help please?
It says that The abstract method "void actionPerformed(java.awt.event.ActionEvent $1);", inherited from type "java.awt.event.ActionListener", is not implemented in the non-abstract class "SharifCalc"

I really don't know what to do? Making the layout is being so hard? How can I just make the layout with the buttons and everything? Thanks if you helped!





// The "SharifCalc" class.
import java.awt.*;
import javax.swing.*; // for GUI components
import java.awt.event.*; // for actions to be registered
import java.io.*; // For file input and output
import java.text.*; // For DecimalFormat and NumberFormat
import java.util.*;
import java.awt.event.ActionListener;

public class SharifCalc extends javax.swing.JFrame implements ActionListener
{
//VARIABLES
double firstNum, secondNum, answer;
NumberFormat noFor = new DecimalFormat ("#0.00");

//declaring panels
JPanel jpnlTop = new JPanel ();
JPanel jpnlBottom = new JPanel ();

//GUI components for input
JLabel title = new JLabel ("Sharif Calculator");
JLabel title2 = new JLabel ("Welcome!");



//Constructor
public SharifCalc (String Title)
{

super (Title);
jpnlTop.add (title);
jpnlTop.add (title2);

//sets the font of the titles
title.setFont (new Font ("SansSerif", Font.BOLD, 22));
title2.setFont (new Font ("SansSerif", Font.BOLD, 18));


//sets the layout of the main panel and adds it
jpnlTop.setLayout (new BoxLayout (jpnlTop, BoxLayout.Y_AXIS));
jpnlBottom.setLayout (new BoxLayout (jpnlBottom, BoxLayout.X_AXIS));
getContentPane ().setLayout (new BoxLayout (getContentPane (), BoxLayout.Y_AXIS));
getContentPane ().add (jpnlTop);
//background colour
jpnlTop.setBackground (new Color (112, 190, 254));
//will exit the program when the X button on the frame is clicked
setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
}


// Buttons

JButton jbtnOne;
JButton jbtnTwo;
JButton jbtnThree;
JButton jbtnFour;
JButton jbtnFive;
JButton jbtnSix;
JButton jbtnSeven;
JButton jbtnEight;
JButton jbtnNine;
JButton jbtnZero;
JButton jbtnAdd;
JButton jbtnSubtract;
JButton jbtnDivide;
JButton jbtnMultiply;
JButton jbtnEqual;
JButton jbtnClear;
JButton jbtnDecimal;
JButton jbtnSquare;
JButton jbtnPercent;

// TextField

JTextField jtfDisplay;

// CalcGui - Consturctor

public SharifCalc ()
{
initComponents ();
pack ();
} // CalcGui - Consturctor


private void initComponents ()
{


{

// Button initilisation

// Number Button

jbtnOne = new JButton ("1");
jbtnTwo = new JButton ("2");
jbtnThree = new JButton ("3");
jbtnFour = new JButton ("4");
jbtnFive = new JButton ("5");
jbtnSix = new JButton ("6");
jbtnSeven = new JButton ("7");
jbtnEight = new JButton ("8");
jbtnNine = new JButton ("9");
jbtnZero = new JButton ("0");

// Operation Button

jbtnAdd = new JButton ("+");
jbtnSubtract = new JButton ("-");
jbtnDivide = new JButton ("/");
jbtnMultiply = new JButton ("*");
jbtnEqual = new JButton ("=");
jbtnClear = new JButton ("C");
jbtnDecimal = new JButton (".");
jbtnSquare = new JButton ("S");
jbtnPercent = new JButton ("%");

// TextField

jtfDisplay = new JTextField (" ");
jtfDisplay.setEnabled (false);

// Panel Layout


getContentPane ().setLayout (new GridLayout (4, 2));

// Window Listener

addWindowListener (new WindowAdapter ()
{
public void windowClosing (WindowEvent evt)
{
System.exit (0);
}
}
);

// Set jpnlTop

jpnlTop.setLayout (new GridLayout (1, 1));

jpnlTop.add (jtfDisplay);

getContentPane ().add (jpnlTop);


// Set jpnlBottom

jpnlBottom.setLayout (new GridLayout (8, 5));

jpnlBottom.add (jbtnOne);
jpnlBottom.add (jbtnTwo);
jpnlBottom.add (jbtnThree);
jpnlBottom.add (jbtnFour);
jpnlBottom.add (jbtnFive);
jpnlBottom.add (jbtnSix);
jpnlBottom.add (jbtnSeven);
jpnlBottom.add (jbtnEight);
jpnlBottom.add (jbtnNine);
jpnlBottom.add (jbtnZero);
jpnlBottom.add (jbtnAdd);
jpnlBottom.add (jbtnSubtract);
jpnlBottom.add (jbtnDivide);
jpnlBottom.add (jbtnMultiply);
jpnlBottom.add (jbtnEqual);
jpnlBottom.add (jbtnDecimal);
jpnlBottom.add (jbtnClear);
jpnlBottom.add (jbtnSquare);
jpnlBottom.add (jbtnPercent);


getContentPane ().add (jpnlBottom);

// Button Declaration

// Value button

jbtnOne.addActionListener (this);
jbtnTwo.addActionListener (this);
jbtnThree.addActionListener (this);
jbtnFour.addActionListener (this);
jbtnFive.addActionListener (this);
jbtnSix.addActionListener (this);
jbtnSeven.addActionListener (this);
jbtnEight.addActionListener (this);
jbtnNine.addActionListener (this);
jbtnZero.addActionListener (this);

// Operation Button

jbtnAdd.addActionListener (this);
jbtnSubtract.addActionListener (this);
jbtnDivide.addActionListener (this);
jbtnEqual.addActionListener (this);
jbtnMultiply.addActionListener (this);
jbtnDecimal.addActionListener (this);
jbtnClear.addActionListener (this);
jbtnSquare.addActionListener (this);
jbtnPercent.addActionListener (this);




}




// Place your code here
} // main method
} // SharifCalc class
Author:  Tony [ Sat Jun 18, 2011 8:31 pm ]
Post subject:  Re: I need a little help for ready to program java? My program will not compile? Want to help please?
Do just what it says
219 @ Sat Jun 18, 2011 8:00 pm wrote:
The abstract method "void actionPerformed(java.awt.event.ActionEvent $1);" ... is not implemented in ... class "SharifCalc"

Implement the missing method.

:


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