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scientific calculator in Java
Forget Code Java scientific calculator


scientific calculator using even-driven programming paradigm of Java.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;

class Calculator extends JFrame {
private final Font BIGGER_FONT = new Font("monspaced",Font.PLAIN, 20);
private JTextField textfield;
private boolean number = true;
private String equalOp = "=";
private CalculatorOp op = new CalculatorOp();

public Calculator() {
textfield = new JTextField("", 12);
textfield.setHorizontalAlignment(JTextField.RIGHT);
textfield.setFont(BIGGER_FONT);
ActionListener numberListener = new NumberListener();
String buttonOrder = "1234567890 ";
JPanel buttonPanel = new JPanel();
buttonPanel.setLayout(new GridLayout(4, 4, 4, 4));
for (int i = 0; i < buttonOrder.length(); i++) {
String key = buttonOrder.substring(i, i+1);
if (key.equals(" ")) {
buttonPanel.add(new JLabel(""));
} else {
JButton button = new JButton(key);
button.addActionListener(numberListener);
button.setFont(BIGGER_FONT);
buttonPanel.add(button);
}
}
ActionListener operatorListener = new OperatorListener();
JPanel panel = new JPanel();
panel.setLayout(new GridLayout(4, 4, 4, 4));
String[] opOrder = {"+", "-", "*", "/","=","C","sin","cos","log"};
for (int i = 0; i < opOrder.length; i++) {
JButton button = new JButton(opOrder[i]);
button.addActionListener(operatorListener);
button.setFont(BIGGER_FONT);
panel.add(button);
}
JPanel pan = new JPanel();
pan.setLayout(new BorderLayout(4, 4));
pan.add(textfield, BorderLayout.NORTH );
pan.add(buttonPanel , BorderLayout.CENTER);
pan.add(panel , BorderLayout.EAST);
this.setContentPane(pan);
this.pack();
this.setTitle("Calculator");
this.setResizable(false);
}
private void action() {
number = true;
textfield.setText("");
equalOp = "=";
op.setTotal("");
}
class OperatorListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
String displayText = textfield.getText();
if (e.getActionCommand().equals("sin"))
{
textfield.setText("" + Math.sin(Double.valueOf(displayText).doubleValue()));

}else
if (e.getActionCommand().equals("cos"))
{
textfield.setText("" + Math.cos(Double.valueOf(displayText).doubleValue()));

}
else
if (e.getActionCommand().equals("log"))
{
textfield.setText("" + Math.log(Double.valueOf(displayText).doubleValue()));

}
else if (e.getActionCommand().equals("C"))
{
textfield.setText("");
}

else
{
if (number)
{

action();
textfield.setText("");

}
else
{
number = true;
if (equalOp.equals("="))
{
op.setTotal(displayText);
}else
if (equalOp.equals("+"))
{
op.add(displayText);
}
else if (equalOp.equals("-"))
{
op.subtract(displayText);
}
else if (equalOp.equals("*"))
{
op.multiply(displayText);
}
else if (equalOp.equals("/"))
{
op.divide(displayText);
}

textfield.setText("" + op.getTotalString());
equalOp = e.getActionCommand();
}
}
}
}
class NumberListener implements ActionListener {
public void actionPerformed(ActionEvent event) {
String digit = event.getActionCommand();
if (number) {
textfield.setText(digit);
number = false;
} else {
textfield.setText(textfield.getText() + digit);
}
}
}
public class CalculatorOp {
private int total;
public CalculatorOp() {
total = 0;
}
public String getTotalString() {
return ""+total;
}
public void setTotal(String n) {
total = convertToNumber(n);
}
public void add(String n) {
total += convertToNumber(n);
}
public void subtract(String n) {
total -= convertToNumber(n);
}
public void multiply(String n) {
total *= convertToNumber(n);
}
public void divide(String n) {
total /= convertToNumber(n);
}
private int convertToNumber(String n) {
return Integer.parseInt(n);
}
}
}
class SwingCalculator {
public static void main(String[] args) {
JFrame frame = new Calculator();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}



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