Hello, I have the source code of a java calculator, but I want to make it can be controlled by keyboard too, so could you please help out? And when you finish it, could you please compress the whole project to a zip file, and reach to my google, whose id is soaking12138. Thank you so much.

Here is the source code:

package calculator;

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.EventQueue;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.border.EmptyBorder;

import java.awt.BorderLayout;

import java.awt.Dimension;

import java.awt.EventQueue;

import javax.swing.DefaultListModel;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.JScrollPane;

import javax.swing.border.EmptyBorder;

import javax.swing.JButton;

import javax.swing.JTextField;

import java.awt.GridLayout;

import javax.swing.JList;

import java.awt.Font;

import javax.swing.SwingConstants;

import java.awt.event.ActionListener;

import java.awt.event.ActionEvent;

import java.text.DecimalFormat;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import javax.swing.JScrollBar;

public class Calculator extends JFrame{

private JPanel contentPane;

private JPanel pnDisplay;

private JPanel pnInput;

private JPanel pnHistory;

private JTextField textField;

private JButton btn7;

private JButton btn8;

private JButton btn9;

private JButton btnAdd;

private JButton btnClearAll;

private JButton btn4;

private JButton btn5;

private JButton btn6;

private JButton btnMinus;

private JButton btnClearText;

private JButton btn1;

private JButton btn2;

private JButton btn3;

private JButton btnMultiply;

private JButton btnMemSet;

private JButton btn0;

private JButton btnDot;

private JButton btnEqual;

private JButton btnDivide;

private JButton btnMemRead;

private DefaultListModel model;

private JList list;

JScrollPane scrollPane = new JScrollPane();

// String to store input data

private String exp="";

/**

* Launch the application.

*/

void updateTextDigit(String s){

exp+=s;

textField.setText(exp);

model.addElement(s);

}

public static double eval(final String str) {

return new Object() {

int pos = -1, ch;

void nextChar() {

ch = (++pos < str.length()) ? str.charAt(pos) : -1;

}

boolean eat(int charToEat) {

while (ch == ' ') nextChar();

if (ch == charToEat) {

nextChar();

return true;

}

return false;

}

double parse() {

nextChar();

double x = parseExpression();

if (pos < str.length()) throw new RuntimeException("Unexpected: " + (char)ch);

return x;

}

// Grammar:

// expression = term | expression `+` term | expression `-` term

// term = factor | term `*` factor | term `/` factor

// factor = `+` factor | `-` factor | `(` expression `)`

//| number | functionName factor | factor `^` factor

double parseExpression() {

double x = parseTerm();

for (;;) {

if(eat('+')) x += parseTerm(); // addition

else if (eat('-')) x -= parseTerm(); // subtraction

else return x;

}

}

double parseTerm() {

double x = parseFactor();

for (;;) {

if(eat('x')) x *= parseFactor(); // multiplication

else if (eat('/')) x /= parseFactor(); // division

else return x;

}

}

double parseFactor() {

if (eat('+')) return parseFactor(); // unary plus

if (eat('-')) return -parseFactor(); // unary minus

double x;

int startPos = this.pos;

if (eat('(')) { // parentheses

x = parseExpression();

eat(')');

} else if ((ch >= '0' && ch <= '9') || ch == '.') { // numbers

while ((ch >= '0' && ch <= '9') || ch == '.') nextChar();

x = Double.parseDouble(str.substring(startPos, this.pos));

} else if (ch >= 'a' && ch <= 'z') { // functions

while (ch >= 'a' && ch <= 'z') nextChar();

String func = str.substring(startPos, this.pos);

x = parseFactor();

if (func.equals("sqrt")) x = Math.sqrt(x);

else if (func.equals("sin")) x = Math.sin(Math.toRadians(x));

else if (func.equals("cos")) x = Math.cos(Math.toRadians(x));

else if (func.equals("tan")) x = Math.tan(Math.toRadians(x));

else throw new RuntimeException("Unknown function: " + func);

} else {

throw new RuntimeException("Unexpected: " + (char)ch);

}

if (eat('^')) x = Math.pow(x, parseFactor()); // exponentiation

return x;

}

}.parse();

}

public static void main(String[] args) {

EventQueue.invokeLater(new Runnable() {

public void run() {

try {

Calculator frame = new Calculator();

frame.setVisible(true);

} catch (Exception e) {

e.printStackTrace();

}

}

});

}

/**

* Create the frame.

*/

public Calculator() {

super("Simple Calculator");

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setBounds(100, 100, 450, 300);

contentPane = new JPanel();

contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));

contentPane.setLayout(new BorderLayout(0, 0));

setContentPane(contentPane);

pnDisplay = new JPanel();

contentPane.add(pnDisplay, BorderLayout.NORTH);

pnDisplay.setLayout(new GridLayout(0, 1, 0, 0));

textField = new JTextField();

textField.setHorizontalAlignment(SwingConstants.RIGHT);

textField.setFont(new Font("Courier New", Font.PLAIN, 28));

textField.disable();

pnDisplay.add(textField);

textField.setDisabledTextColor(Color.black);

textField.setColumns(10);

pnInput = new JPanel();

contentPane.add(pnInput, BorderLayout.CENTER);

pnInput.setLayout(new GridLayout(4, 5, 5, 5));

btn7 = new JButton("7");

btn7.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent arg0) {

updateTextDigit("7");

}

});

btn7.setFont(new Font("Times Roman", Font.BOLD, 14));

pnInput.add(btn7);

btn8 = new JButton("8");

btn8.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent arg0) {

updateTextDigit("8");

}

});

btn8.setFont(new Font("Times Roman", Font.BOLD, 14));

pnInput.add(btn8);

btn9 = new JButton("9");

btn9.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent arg0) {

updateTextDigit("9");

}

});

btn9.setFont(new Font("Times Roman", Font.BOLD, 14));

pnInput.add(btn9);

btnAdd = new JButton("+");

btnAdd.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent arg0) {

int len=exp.length();

len=len-1;

String c="";

int f=0;

try {

c = Character.toString(exp.charAt(len));

}catch (Exception e){

f=1;

}

if(f!=1){

if(c.equals("+")||c.equals("-")||c.equals("x")||c.equals("/")||c.equals(".")){

}

else{

updateTextDigit("+");

}}

}

});

btnAdd.setFont(new Font("Times Roman", Font.BOLD, 14));

pnInput.add(btnAdd);

btnClearAll = new JButton("C");

btnClearAll.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent arg0) {

// reset all the data

textField.setText("");

exp="";

}

});

btnClearAll.setFont(new Font("Times Roman", Font.BOLD, 14));

pnInput.add(btnClearAll);

btn4 = new JButton("4");

btn4.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent arg0) {

updateTextDigit("4"); }

});

btn4.setFont(new Font("Times Roman", Font.BOLD, 14));

pnInput.add(btn4);

btn5 = new JButton("5");

btn5.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent arg0) {

updateTextDigit("5");

}

});

btn5.setFont(new Font("Times Roman", Font.BOLD, 14));

pnInput.add(btn5);

btn6 = new JButton("6");

btn6.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent arg0) {

updateTextDigit("6");

}

});

btn6.setFont(new Font("Times Roman", Font.BOLD, 14));

pnInput.add(btn6);

btnMinus = new JButton("-");

btnMinus.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent arg0) {

int len=exp.length();

len=len-1;

String c="";

int f=0;

try {

c = Character.toString(exp.charAt(len));

}catch (Exception e){

f=1;

}

if(f!=1){

if(c.equals("+")||c.equals("-")||c.equals("x")||c.equals("/")||c.equals(".")){

}

else{

updateTextDigit("-");

}}

}

});

btnMinus.setFont(new Font("Times Roman", Font.BOLD, 14));

pnInput.add(btnMinus);

btnClearText = new JButton("CE");

btnClearText.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

// reset the textfield only

textField.setText("");

exp="";

model.clear();

}

});

btnClearText.setFont(new Font("Times Roman", Font.BOLD, 14));

pnInput.add(btnClearText);

btn1 = new JButton("1");

btn1.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent arg0) {

updateTextDigit("1");

}

});

btn1.setFont(new Font("Times Roman", Font.BOLD, 14));

pnInput.add(btn1);

btn2 = new JButton("2");

btn2.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent arg0) {

updateTextDigit("2");

}

});

btn2.setFont(new Font("Times Roman", Font.BOLD, 14));

pnInput.add(btn2);

btn3 = new JButton("3");

btn3.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent arg0) {

updateTextDigit("3");

}

});

btn3.setFont(new Font("Times Roman", Font.BOLD, 14));

pnInput.add(btn3);

btnMultiply = new JButton("x");

btnMultiply.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent arg0) {

int len=exp.length();

len=len-1;

String c="";

int f=0;

try {

c = Character.toString(exp.charAt(len));

}catch (Exception e){

f=1;

}

if(f!=1){

if(c.equals("+")||c.equals("-")||c.equals("x")||c.equals("/")||c.equals(".")){

}

else{

updateTextDigit("x");

}}

}

});

btnMultiply.setFont(new Font("Times Roman", Font.BOLD, 14));

pnInput.add(btnMultiply);

btnMemSet = new JButton("MS");

btnMemSet.setFont(new Font("Times Roman", Font.BOLD, 14));

pnInput.add(btnMemSet);

btn0 = new JButton("0");

btn0.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent arg0) {

updateTextDigit("0");

}

});

btn0.setFont(new Font("Times Roman", Font.BOLD, 14));

pnInput.add(btn0);

btnDot = new JButton(".");

btnDot.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent arg0) {

int len=exp.length();

len=len-1;

String c="";

int f=0;

try {

c = Character.toString(exp.charAt(len));

}catch (Exception e){

f=1;

}

if(f!=1){

if(c.equals("+")||c.equals("-")||c.equals("*." +

"")||c.equals("/")||c.equals(".")){

}

else{

updateTextDigit(".");

}}

}

});

btnDot.setFont(new Font("Times Roman", Font.BOLD, 14));

pnInput.add(btnDot);

btnEqual = new JButton("=");

btnEqual.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent arg0) {

DecimalFormat f = new DecimalFormat("##.0000");

if(exp!="") {

try {

exp = Double.toString(eval(exp));

textField.setText(exp);

model.addElement("=");

model.addElement(exp);

} catch (Exception e) {

exp = "Error";

textField.setText(exp);

model.addElement("=");

model.addElement(exp);

exp="";

}

}

}

});

btnEqual.setFont(new Font("Times Roman", Font.BOLD, 14));

pnInput.add(btnEqual);

btnDivide = new JButton("/");

btnDivide.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent arg0) {

int len=exp.length();

len=len-1;

String c="";

int f=0;

try {

c = Character.toString(exp.charAt(len));

}catch (Exception e){

f=1;

}

if(f!=1){

if(c.equals("+")||c.equals("-")||c.equals("x")||c.equals("/")||c.equals(".")){

}

else{

updateTextDigit("/");}}

}

});

btnDivide.setFont(new Font("Times Roman", Font.BOLD, 14));

pnInput.add(btnDivide);

btnMemRead = new JButton("MR");

btnMemRead.setFont(new Font("Times Roman", Font.BOLD, 14));

pnInput.add(btnMemRead);

pnHistory = new JPanel();

contentPane.add(pnHistory, BorderLayout.EAST);

pnHistory.setPreferredSize(new Dimension(120, 200));

pnHistory.setLayout(new BorderLayout(5, 5));

model =new DefaultListModel();

list = new JList(model);

scrollPane.setViewportView(list);

list.setLayoutOrientation(JList.VERTICAL);

list.addMouseListener(new MouseAdapter() {

@Override

public void mouseClicked(MouseEvent arg0) {

if((String)list.getSelectedValue()!=null) {

exp="";

updateTextDigit((String)list.getSelectedValue());

}

}

});

pnHistory.add(scrollPane);

/*

* End of GUI code

*/

// initialize data

}

}