Assalam u Alikum Everyone!
Once I made a simple Java Calculator - I have decided to make it open source :)
so here goes the complete code for this java calculator.
import java.awt.FlowLayout;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
public class Calculator
{
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
CalculatorFrame frame = new CalculatorFrame();
frame.setSize(800, 211);
JLabel label= new JLabel("<html><FONT SIZE=28><font color=#FF0000>A</font><font color=#00FF00>H</font><font color=00FFFF>M</font><font color=#FFFF00>A</font><font color=#0000FF>D</font>"
+ "<font color=FF00FF> O</font><font color=#FF0000>S</font><font color=FF00FF>A</font><font color=#C0C0C0>M</font><font color=#FF0000>A</font></FONT> presents <br></FONT>"
+"NUST School of Electrical Engineering<br> and Computer Science<br>" +
"<br>Scientific Calculator v3.0<br>" +
"<br>FB.ME/FRONTLINE.FIGHTER<br>FRONTLINE.FIGHTER@LIVE.COM"+
"<<br>Any Comments / Critisim is HeartIly accepted",JLabel.RIGHT);
Container contentPane = frame.getContentPane();
contentPane.add(label);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
});
}
}
/**
* A frame with a calculator panel.
*/
class CalculatorFrame extends JFrame
{
public CalculatorFrame()
{
setTitle("Scientific Calculator by Mohammed Ahmad Osama - fb.me/frontline.fighter");
CalculatorPanel panel = new CalculatorPanel();
add(panel);
pack();
}
}
/**
* A panel with calculator buttons and a result display.
*/
class CalculatorPanel extends JPanel
{
public CalculatorPanel()
{
setLayout(new BorderLayout());
result = 0;
lastCommand = "=";
start = true;
// add the display
display = new JButton("0.00000");
display.setEnabled(false);
add(display, BorderLayout.NORTH);
display.setBackground(Color.cyan);
ActionListener insert = new InsertAction();
ActionListener command = new CommandAction();
// add the buttons in a n x n grid
panel = new JPanel();
panel.setLayout(new GridLayout(6, 6));
//1
addButton("7", insert);
addButton("8", insert);
addButton("9", insert);
addButton("/", command);
addButton("Sin", command);
addButton("ArcSin", command);
//2
addButton("4", insert);
addButton("5", insert);
addButton("6", insert);
addButton("*", command);
addButton("Cos", command);
addButton("ArcCos", command);
//3
addButton("1", insert);
addButton("2", insert);
addButton("3", insert);
addButton("-", command);
addButton("Tan", command);
addButton("ArcTan", command);
//4
addButton("0", insert);
addButton(".", insert);
addButton("=", command);
addButton("+", command);
addButton("AC", command);
addButton("Sinh", command);
//5
addButton("Cbrt", command);
addButton("Cube", command);
addButton("Ln", command);
addButton("Log", command);
addButton("e", command);
addButton("cosh", command);
//6
addButton("Sqrt", command);
addButton("Sqr", command);
addButton("|x|", command);
addButton("Inverse", command);
addButton("!", command);
addButton("Tanh", command);
add(panel, BorderLayout.CENTER);
}
/**
* Adds a button to the center panel.
* @param label the button label
* @param listener the button listener
*/
private void addButton(String label, ActionListener listener)
{
JButton button = new JButton(label);
button.setForeground(Color.magenta);
button.addActionListener(listener);
panel.add(button);
}
/**
* This action inserts the button action string to the end of the display text.
*/
private class InsertAction implements ActionListener
{
public void actionPerformed(ActionEvent event)
{
String input = event.getActionCommand();
if (start)
{
display.setText("");
start = false;
}
display.setText(display.getText() + input);
}
}
/**
* This action executes the command that the button action string denotes.
*/
private class CommandAction implements ActionListener
{
public void actionPerformed(ActionEvent event)
{
String command = event.getActionCommand();
if (start)
{
if (command.equals("-"))
{
display.setText(command);
start = false;
}
else lastCommand = command;
}
else
{
calculate(Double.parseDouble(display.getText()));
lastCommand = command;
start = true;
}
}
}
/**
* Carries out the pending calculation.
* @param x the value to be accumulated with the prior result.
*/
// Evaluate n!
//double i,j=1;
public void calculate(double x)
{
// x=Math.toDegrees(x);
if (lastCommand.equals("+")) result += x;
else if (lastCommand.equals("-")) result -= x;
else if (lastCommand.equals("*")) result *= x;
else if (lastCommand.equals("/")) result /= x;
else if (lastCommand.equals("Inverse")) result = 1/x;
else if (lastCommand.equals("=")) result = x;
else if (lastCommand.equals("AC")) result = 0;
else if (lastCommand.equals("Sin")) result =Math.sin(x);
else if (lastCommand.equals("Cos")) result =Math.cos(x);
else if (lastCommand.equals("Tan")) result =Math.tan(x);
else if (lastCommand.equals("ArcSin")) result =Math.asin(x);
else if (lastCommand.equals("ArcCos")) result =Math.acos(x);
else if (lastCommand.equals("ArcTan")) result =Math.atan(x);
else if (lastCommand.equals("Cosh")) result = (Math.exp(x) + Math.exp(-x)) / 2.0;
else if (lastCommand.equals("Sin")) result = (Math.exp(x) - Math.exp(-x)) / 2.0;
else if (lastCommand.equals("Tanh")) result =((Math.exp(x) - Math.exp(-x)) /(Math.exp(x) + Math.exp(-x)));
else if (lastCommand.equals("Sqrt")) result = Math.sqrt(x);
else if (lastCommand.equals("Cbrt")) result = Math.cbrt(x);
else if (lastCommand.equals("Sqr")) result =Math.pow(x,2);
else if (lastCommand.equals("Cube")) result =Math.pow(x,3);
else if (lastCommand.equals("e")) result = Math.exp(x);
else if (lastCommand.equals("|x|")) result = Math.abs(x);
else if (lastCommand.equals("Ln")) result = Math.log(x);
else if (lastCommand.equals("Log")) result = Math.log10(x);
// else if (lastCommand.equals("!")) result = j;
// else if (lastCommand.equals("=")) result = x;
// else if (lastCommand.equals("=")) result = x;
// else if (lastCommand.equals("=")) result = x;
display.setText("" + result);
}
private JButton display;
private JPanel panel;
private double result;
private String lastCommand;
private boolean start;
}
