package calc;

import java.awt.EventQueue;

import javax.swing.JFrame;

import javax.swing.JButton;

import java.awt.GridLayout;

import javax.swing.JPanel;

import javax.swing.JSplitPane;

import javax.swing.BoxLayout;

import javax.swing.JTextField;

import java.awt.event.ActionListener;

import java.awt.event.ActionEvent;

public class CalcApp

{

private JFrame frame;

private static JTextField textField;

private double total1 ;

private double total2 = 0.0;

private double total = 0.0;

private char math_operator;

protected String btnText;

/**

* Launch the application.

*/

public static void main(String[] args) {

EventQueue.invokeLater(new Runnable() {

public void run() {

try {

CalcApp window = new CalcApp();

window.frame.setVisible(true);

} catch (Exception e) {

e.printStackTrace();

}

}

});

}

/**

* Create the application.

*/

public CalcApp() {

initialize();

}

/**

* Initialize the contents of the frame.

*/

private void initialize()

{

frame = new JFrame();

frame.setBounds(100, 100, 640, 480);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.getContentPane().setLayout(new BoxLayout(frame.getContentPane(), BoxLayout.X_AXIS));

JSplitPane splitPane = new JSplitPane();

splitPane.setOrientation(JSplitPane.VERTICAL_SPLIT);

frame.getContentPane().add(splitPane);

JPanel panel = new JPanel();

splitPane.setRightComponent(panel);

panel.setLayout(new GridLayout(5, 4, 0, 0));

JPanel panel_1 = new JPanel();

splitPane.setLeftComponent(panel_1);

setupButtons(panel);

textField = new JTextField();

panel_1.add(textField);

textField.setColumns(55);

}

private void setupButtons(JPanel panel){

JButton clearEntryButton = new JButton("CE");

clearEntryButton.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

}

});

panel.add(clearEntryButton);

JButton clearAllButton = new JButton("C");

clearAllButton.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

textField.setText("");

}

});

panel.add(clearAllButton);

JButton backspaceButton = new JButton("Backspace");

backspaceButton.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

}

});

panel.add(backspaceButton);

JButton divideButton = new JButton("/");

divideButton.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

total = Double.parseDouble(textField.getText( ) ) ;

total1 = total1 / total;

textField.setText("");

}

});

panel.add(divideButton);

JButton button7 = new JButton("7");

button7.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

textField.setText(textField.getText()+"7");

}

});

panel.add(button7);

JButton button8 = new JButton("8");

button8.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

textField.setText(textField.getText()+"8");

}

});

panel.add(button8);

JButton button9 = new JButton("9");

button9.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

textField.setText(textField.getText()+"9");

}

});

panel.add(button9);

JButton buttonMultiply = new JButton("X");

buttonMultiply.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

total1 = total1 * Double.parseDouble(textField.getText( ) ) ;

textField.setText("");

}

});

panel.add(buttonMultiply);

JButton button4 = new JButton("4");

button4.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

textField.setText(textField.getText()+"4");

}

});

panel.add(button4);

JButton button5 = new JButton("5");

button5.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

textField.setText(textField.getText()+"5");

}

});

panel.add(button5);

JButton button6 = new JButton("6");

button6.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

textField.setText(textField.getText()+"6");

}

});

panel.add(button6);

JButton buttonSubtract = new JButton("-");

buttonSubtract.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

total1 = total1 - Double.parseDouble(textField.getText( ) ) ;

textField.setText("");

}

});

panel.add(buttonSubtract);

JButton button1 = new JButton("1");

button1.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

textField.setText(textField.getText()+"1");

}

});

panel.add(button1);

JButton button2 = new JButton("2");

button2.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

textField.setText(textField.getText()+"2");

}

});

panel.add(button2);

JButton button3 = new JButton("3");

button3.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

textField.setText(textField.getText()+"3");

}

});

panel.add(button3);

JButton buttonAddition = new JButton("+");

buttonAddition.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

total1 = total1 + Double.parseDouble(textField.getText( ) ) ;

textField.setText("");

}

});

panel.add(buttonAddition);

JButton buttonPlusNegative = new JButton("+ -");

buttonPlusNegative.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

total2 = total1 - Double.parseDouble(textField.getText( ) ) ;

textField.setText( Double.toString(total2) );

total1 = 0;

}

});

panel.add(buttonPlusNegative);

JButton button0 = new JButton("0");

button0.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

textField.setText(textField.getText()+"0");

}

});

panel.add(button0);

JButton buttonDecimal = new JButton(".");

buttonDecimal.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

textField.setText(textField.getText()+".");

}

});

panel.add(buttonDecimal);

JButton buttonEquals = new JButton("=");

buttonEquals.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

total2 = total1 + Double.parseDouble(textField.getText( ) ) ;

textField.setText( Double.toString(total2) );

total1 = 0;

}

});

panel.add(buttonEquals);

}

}

how to get multiplication, subtraction, and division and backspace to work in this calculator code