import java.awt.*;
import java.lang.*;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.event.*;
import java.text.DecimalFormat;
public class Calculator
implements ActionListener { //???붯???????ӿ?
//???????еĵ?λ
JFrame frame;//??????
JTextField textAnswer;//??ʾ?ı???
JPanel panel, panel1, panel2, panel3;
JMenuBar mainMenu;
JTextField textMemory;
JLabel labelMemSpace; //labelMemSpace?????????裬??????????״
JButton buttonBk, buttonCe, buttonC;
JButton button[];
JButton buttonMC, buttonMR, buttonMS, buttonMAdd;
JButton buttonDot, buttonAddAndSub, buttonAdd, buttonSub, buttonMul,
buttonDiv, buttonMod;
JButton buttonSqrt, buttonDao, buttonEqual;
JMenu viewMenu, helpMenu;
JMenuItem tItem, sItem, topHelp, aboutCal;
DecimalFormat df; //???????????????
boolean clickable; //???Ƶ?ǰ?ܷ?
double memoryd; //ʹ???ڴ??д洢??????
int memoryi;
double vard, answerd; //????????double?????ݵ??м?ֵ(vard)???????(answerd)
short key = -1, prekey = -1; //key???????浱ǰ???к???????,prekey????????ǰ?ν??к???????
String copy; //????????
JTextArea help; //????
JScrollPane scrollHelp;
//???캯??
public Calculator() {
clickable = true;
answerd = 0;
frame = new JFrame("??????");
df = new DecimalFormat("0.00000000"); //???????????????(????double??ֵ)
textAnswer = new JTextField(15);
textAnswer.setText("");
textAnswer.setHorizontalAlignment(JTextField.RIGHT);
textAnswer.setBorder(BorderFactory.createLineBorder(Color.red));
textAnswer.setEditable(false);
textAnswer.setBackground(new Color(255, 255, 255));
panel = new JPanel();
frame.getContentPane().add(panel);
panel1 = new JPanel();
panel2 = new JPanel();
panel.setLayout(new BorderLayout());
//??????????
mainMenu = new JMenuBar();
viewMenu = new JMenu("?鿴(V)");
helpMenu = new JMenu("????(H)");
tItem = new JMenuItem("?????(T)");
tItem.addActionListener(this);
sItem = new JMenuItem("???ѧ??(S)");
sItem.addActionListener(this);
viewMenu.add(tItem);
viewMenu.add(sItem);
topHelp = new JMenuItem(" ????????(H)");
topHelp.addActionListener(this);
help = new JTextArea(5, 20);
scrollHelp = new JScrollPane(help);
help.setEditable(false);
help.append("ִ?м???\n");
help.append("1. ???????ĵ?һ?????֡?\n");
help.append("2. ??????+??ִ?мӡ???-??ִ?м?????*??ִ?г˻?/??ִ?г???\n");
help.append("3. ??????????һ?????֡?\n");
help.append("4. ????????ʣ?????????????֡?\n");
help.append("5. ??????=????\n");
aboutCal = new JMenuItem(" ???ڼ?????(A)");
aboutCal.addActionListener(this);
helpMenu.add(topHelp);
helpMenu.add(aboutCal);
mainMenu.add(viewMenu);
mainMenu.add(helpMenu);
panel.add(mainMenu, BorderLayout.NORTH);
panel.add(textAnswer, BorderLayout.CENTER);
panel.add(panel1, BorderLayout.SOUTH);
panel1.setLayout(new BorderLayout());
textMemory = new JTextField(3);
textMemory.setEditable(false);
textMemory.setBackground(new Color(217, 217, 217));
labelMemSpace = new JLabel(" ");
buttonBk = new JButton("Backspace");
buttonBk.setForeground(new Color(255, 0, 0));
buttonCe = new JButton("CE");
buttonCe.setForeground(new Color(255, 0, 0));
buttonC = new JButton("C");
buttonC.setForeground(new Color(255, 0, 0));
buttonBk.addActionListener(this);
buttonCe.addActionListener(this);
buttonC.addActionListener(this);
panel1.add(panel2, BorderLayout.NORTH);
panel2.setLayout(new FlowLayout(FlowLayout.RIGHT));
panel2.add(textMemory);
panel2.add(labelMemSpace);
panel2.add(buttonBk);
panel2.add(buttonCe);
panel2.add(buttonC);
panel3 = new JPanel();
panel1.add(panel3, BorderLayout.CENTER);
button = new JButton[10];
for (int i = 0; i < button.length; i++) {
button[i] = new JButton(Integer.toString(i));
button[i].setForeground(new Color(0, 0, 255));
}
buttonMC = new JButton("MC");
buttonMC.setForeground(new Color(255, 0, 0));
buttonMR = new JButton("MR");
buttonMR.setForeground(new Color(255, 0, 0));
buttonMS = new JButton("MS");
buttonMS.setForeground(new Color(255, 0, 0));
buttonMAdd = new JButton("M+");
buttonMAdd.setForeground(new Color(255, 0, 0));
buttonDot = new JButton(".");
buttonDot.setForeground(new Color(0, 0, 255));
buttonAddAndSub = new JButton("+/-");
buttonAddAndSub.setForeground(new Color(0, 0, 255));
buttonAdd = new JButton("+");
buttonAdd.setForeground(new Color(255, 0, 0));
buttonSub = new JButton("-");
buttonSub.setForeground(new Color(255, 0, 0));
buttonMul = new JButton("*");
buttonMul.setForeground(new Color(255, 0, 0));
buttonDiv = new JButton("/");
buttonDiv.setForeground(new Color(255, 0, 0));
buttonMod = new JButton("%");
buttonMod.setForeground(new Color(0, 0, 255));
buttonSqrt = new JButton("sqrt");
buttonSqrt.setForeground(new Color(0, 0, 255));
buttonDao = new JButton("1/x");
buttonDao.setForeground(new Color(0, 0, 255));
buttonEqual = new JButton("=");
buttonEqual.setForeground(new Color(255, 0, 0));
//????????Ϊ???????
panel3.setLayout(new GridLayout(4, 6));
panel3.add(buttonMC);
buttonMC.addActionListener(this);
panel3.add(button[7]);
button[7].addActionListener(this);
panel3.add(button[8]);
button[8].addActionListener(this);
panel3.add(button[9]);
button[9].addActionListener(this);
panel3.add(buttonDiv);
buttonDiv.addActionListener(this);
panel3.add(buttonSqrt);
buttonSqrt.addActionListener(this);
panel3.add(buttonMR);
buttonMR.addActionListener(this);
panel3.add(button[4]);
button[4].addActionListener(this);
panel3.add(button[5]);
button[5].addActionListener(this);
panel3.add(button[6]);
button[6].addActionListener(this);
panel3.add(buttonMul);
buttonMul.addActionListener(this);
panel3.add(buttonMod);
buttonMod.addActionListener(this);
panel3.add(buttonMS);
buttonMS.addActionListener(this);
panel3.add(button[1]);
button[1].addActionListener(this);
panel3.add(button[2]);
button[2].addActionListener(this);
panel3.add(button[3]);
button[3].addActionListener(this);
panel3.add(buttonSub);
buttonSub.addActionListener(this);
panel3.add(buttonDao);
buttonDao.addActionListener(this);
panel3.add(buttonMAdd);
buttonMAdd.addActionListener(this);
panel3.add(button[0]);
button[0].addActionListener(this);
panel3.add(buttonAddAndSub);
buttonAddAndSub.addActionListener(this);
panel3.add(buttonDot);
buttonDot.addActionListener(this);
panel3.add(buttonAdd);
buttonAdd.addActionListener(this);
panel3.add(buttonEqual);
buttonEqual.addActionListener(this);
frame.setDefaultCloseOperation(frame.EXIT_ON_CLOSE);
frame.pack();
frame.show();
}
//???ø?????ť??Ϊ
public void actionPerformed(ActionEvent event) {
boolean sign = false; //?ж??Ƿ???double???????????㣬??Ϊtrue??????Ϊfalse
Object temp = event.getSource();
try {
//??????????ݰ?ť???????µİ?ť?????????ݲ???ĵ?ǰ?ı????ַ???֮??
for (int i = 0; i <= 9; i++)
if (temp == button[i] && clickable == true)
textAnswer.setText(textAnswer.getText() + Integer.toString(i));
//????'.'??ťʱ???жϵ?ǰ?ı??????ַ????к?????'.'??????Ѻ??????????ٲ???'.'
if (temp == buttonDot && clickable == true) {
boolean isDot = false;
if (textAnswer.getText().length() == 0)
isDot = true;
for (int i = 0; i < textAnswer.getText().length(); i++)
if ('.' == textAnswer.getText().charAt(i)) {
isDot = true;
break;
}
if (isDot == false)
textAnswer.setText(textAnswer.getText() + ".");
}
if ( (temp == buttonAdd || temp == buttonSub || temp == buttonMul ||
temp == buttonDiv) && clickable == true) {
//'+'????
if (temp == buttonAdd) {
switch (prekey) {
case 0:
answerd += Double.parseDouble(textAnswer.getText());
break;
case 1:
answerd -= Double.parseDouble(textAnswer.getText());
break;
case 2:
answerd *= Double.parseDouble(textAnswer.getText());
break;
case 3:
if (Double.parseDouble(textAnswer.getText()) == 0) {
textAnswer.setText("????????Ϊ??");
clickable = false;
}
else
answerd /= Double.parseDouble(textAnswer.getText());
break;
default:
answerd = Double.parseDouble(textAnswer.getText());
}
textAnswer.setText("");
prekey = key = 0;
}
//'-'????
if (temp == buttonSub) {
switch (prekey) {
case 0:
answerd += Double.parseDouble(textAnswer.getText());
break;
case 1:
answerd -= Double.parseDouble(textAnswer.getText());
break;
case 2:
answerd *= Double.parseDouble(textAnswer.getText());
break;
case 3:
if (Double.parseDouble(textAnswer.getText()) == 0) {
textAnswer.setText("????????Ϊ??");
clickable = false;
}
else
answerd /= Double.parseDouble(textAnswer.getText());
break;
default:
answerd = Double.parseDouble(textAnswer.getText());
}
textAnswer.setText("");
prekey = key = 1;
}
//'*'????
if (temp == buttonMul) {
switch (prekey) {
case 0:
answerd += Double.parseDouble(textAnswer.getText());
break;
case 1:
answerd -= Double.parseDouble(textAnswer.getText());
break;
case 2:
answerd *= Double.parseDouble(textAnswer.getText());
break;
case 3:
if (Double.parseDouble(textAnswer.getText()) == 0) {
textAnswer.setText("????????Ϊ??");
clickable = false;
}
else
answerd /= Double.parseDouble(textAnswer.getText());
break;
default:
answerd = Double.parseDouble(textAnswer.getText());
}
textAnswer.setText("");
prekey = key = 2;
}
//'/'????
if (temp == buttonDiv) {
switch (prekey) {
case 0:
answerd += Double.parseDouble(textAnswer.getText());
break;
case 1:
answerd -= Double.parseDouble(textAnswer.getText());
break;
case 2:
answerd *= Double.parseDouble(textAnswer.getText());
break;
case 3:
if (Double.parseDouble(textAnswer.getText()) == 0) {
textAnswer.setText("????????Ϊ??");
clickable = false;
}
else
answerd /= Double.parseDouble(textAnswer.getText());
break;
default:
answerd = Double.parseDouble(textAnswer.getText());
}
textAnswer.setText("");
prekey = key = 3;
}
}
//'='????
if (temp == buttonEqual && clickable == true) {
//?????????'=',?????????????
if (prekey == 5) {
if (key == 0) {
answerd += vard;
textAnswer.setText(df.format(answerd));
}
if (key == 1) {
answerd -= vard;
textAnswer.setText(df.format(answerd));
}
if (key == 2) {
answerd *= vard;
textAnswer.setText(df.format(answerd));
}
if (key == 3) {
if (Double.parseDouble(textAnswer.getText()) == 0) {
textAnswer.setText("????????Ϊ??");
clickable = false;
}
else {
answerd /= vard;
textAnswer.setText(df.format(answerd));
}
}
}
else {
vard = Double.parseDouble(textAnswer.getText());
if (key == 0) {
prekey = -1;
answerd += Double.parseDouble(textAnswer.getText());
textAnswer.setText(df.format(answerd));
}
if (key == 1) {
prekey = -1;
answerd -= Double.parseDouble(textAnswer.getText());
textAnswer.setText(df.format(answerd));
}
if (key == 2) {
prekey = -1;
answerd *= Double.parseDouble(textAnswer.getText());
textAnswer.setText(df.format(answerd));
}
if (key == 3) {
prekey = -1;
if (Double.parseDouble(textAnswer.getText()) == 0) {
textAnswer.setText("????????Ϊ??");
clickable = false;
}
else {
answerd /= Double.parseDouble(textAnswer.getText());
textAnswer.setText(df.format(answerd));
}
}
}
prekey = 5;
}
//'%'???????Եڶ?????????????100
if (temp == buttonMod && clickable == true) {
if (answerd == 0) {
String s = textAnswer.getText();
textAnswer.setText(s);
}
else {
boolean isDot = false;
for (int i = 0; i < textAnswer.getText().length(); i++)
if ('.' == textAnswer.getText().charAt(i)) {
isDot = true;
break;
}
//?????double??????100
if (isDot == true) {
double dtemp = Double.parseDouble(textAnswer.getText());
dtemp = dtemp / 100.0;
textAnswer.setText(Double.toString(dtemp));
}
else {
//?????int?????ܱ?100????????ȥ??ĩβ??????
if (Integer.parseInt(textAnswer.getText()) % 100 == 0) {
int itemp = Integer.parseInt(textAnswer.getText());
itemp /= 100;
textAnswer.setText(Integer.toString(itemp));
}
//?????int?????????ܱ?100????????double??????
else {
double dtemp = Double.parseDouble(textAnswer.getText());
dtemp = dtemp / 100.0;
textAnswer.setText(Double.toString(dtemp));
}
}
}
}
//??????????
if (temp == buttonSqrt && clickable == true) {
String s = textAnswer.getText();
if (s.charAt(0) == '-') {
textAnswer.setText("???????ܿ?????");
clickable = false;
}
else
textAnswer.setText(Double.toString(java.lang.Math.sqrt(Double.
parseDouble(textAnswer.getText()))));
}
//????????
if (temp == buttonDao && clickable == true) {
if (textAnswer.getText().charAt(0) == '0' &&
textAnswer.getText().length() == 1) {
textAnswer.setText("?㲻??????");
clickable = false;
}
else {
boolean isDec = true;
int i, j, k;
String s = Double.toString(1 / Double.parseDouble(textAnswer.getText()));
for (i = 0; i < s.length(); i++)
if (s.charAt(i) == '.')
break;
for (j = i + 1; j < s.length(); j++)
if (s.charAt(j) != '0') {
isDec = false;
break;
}
if (isDec == true) {
String stemp = "";
for (k = 0; k < i; k++)
stemp += s.charAt(k);
textAnswer.setText(stemp);
}
else
textAnswer.setText(s);
}
}
//????'+/-'??ťʱ????
if (temp == buttonAddAndSub && clickable == true) {
boolean isNumber = true;
String s = textAnswer.getText();
for (int i = 0; i < s.length(); i++)
if (! (s.charAt(i) >= '0' && s.charAt(i) <= '9' || s.charAt(i) == '.' ||
s.charAt(i) == '-')) {
isNumber = false;
break;
}
if (isNumber == true) {
//?????ǰ?ַ???????ĸ??'-'??,?????????Ǹ?????,?ٰ???ʱ,??????ȥ??
if (s.charAt(0) == '-') {
textAnswer.setText("");
for (int i = 1; i < s.length(); i++) {
char a = s.charAt(i);
textAnswer.setText(textAnswer.getText() + a);
}
}
//?????ǰ?ַ?????һ???ַ????Ƿ??ţ???????һ????????????ĸ??
else
textAnswer.setText('-' + s);
}
}
//???????й??ڴ????
//'MC'?IJ????????ڴ???0
if (temp == buttonMC && clickable == true) {
memoryd = memoryi = 0;
textMemory.setText("");
}
//'MS'?IJ?????????ǰ?ı??????ݱ??????ڴ棬??ʾ'M'
if (temp == buttonMS && clickable == true) {
boolean isDot = false;
textMemory.setText(" M");
for (int i = 0; i < textAnswer.getText().length(); i++)
if ('.' == textAnswer.getText().charAt(i)) {
isDot = true;
break;
}
//?????double,?????memoryd(double?洢??)
if (isDot == true) {
memoryd = Double.parseDouble(textAnswer.getText());
memoryi = 0; //??֤?洢???д?????µ?ֵ
}
//?????int,?????memoryi(int?洢??)
else {
memoryi = Integer.parseInt(textAnswer.getText());
memoryd = 0; //??֤?洢???д?????µ?ֵ
}
}
//'MR'?IJ????????洢???е???Ϣ???
if (temp == buttonMR && clickable == true) {
if (memoryd != 0)
textAnswer.setText(Double.toString(memoryd));
if (memoryi != 0)
textAnswer.setText(Integer.toString(memoryi));
}
//'M+'?Ĺ??ܣ?????ǰ?ı?????????ݺʹ洢??????????Ӻ??ٴ???洢??
if (temp == buttonMAdd && clickable == true) {
boolean isDot = false;
for (int i = 0; i < textAnswer.getText().length(); i++)
if ('.' == textAnswer.getText().charAt(i)) {
isDot = true;
break;
}
if (memoryi != 0) { //?洢????һ??int????
if (isDot == false) //????????һ??int????
memoryi += Integer.parseInt(textAnswer.getText());
else { //????????һ??double????????int?洢??????????double?洢???뵱ǰ????ӣ?int?洢??????
memoryd = memoryi + Double.parseDouble(textAnswer.getText());
memoryi = 0;
}
}
else
memoryd += Double.parseDouble(textAnswer.getText());
}
//????'Backspace'????????ѭ??????ǰ?ַ????е????һ????ĸɾ??
if (temp == buttonBk && clickable == true) {
String s = textAnswer.getText();
textAnswer.setText("");
for (int i = 0; i < s.length() - 1; i++) {
char a = s.charAt(i);
textAnswer.setText(textAnswer.getText() + a);
}
}
//????'CE'??ť??????ǰ?ı????????????
if (temp == buttonCe) {
textAnswer.setText("");
clickable = true;
}
//????'C'??ť???ı??????????????ͬʱvar,answer??0
if (temp == buttonC) {
vard = answerd = 0;
textAnswer.setText("");
clickable = true;
}
if (temp == sItem) {
JOptionPane.showMessageDialog(panel, "??ǰ?DZ??ͼ???????\n??ѧ?ͼ??????д????¡?");
}
//????'????????'?˵???
if (temp == topHelp) {
JOptionPane.showMessageDialog(panel, scrollHelp);
}
//????'????'?˵???
if (temp == aboutCal) {
JOptionPane.showMessageDialog(panel, "?????ߣ?zxf");
}
}
//??????????в????Ƿ??????簴??????'+'???????쳣
catch (Exception e) {
textAnswer.setText("?????Ƿ?");
clickable = false;
}
}
//??????
public static void main(String args[]) {
new Calculator();
}
}