java计算器.txt

学长用JAVA设计的计算器

//frame版程序源代码如下，疏漏之处，望批评指正。 
//数字分组没有编写，科学型计算器没有编写，其他已经完善。 
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 { //导入动作监听接口 
//设计面板中的单位 
JFrame frame; 
JTextField textAnswer; 
JPanel panel, panel1, panel2, panel3; 
JMenuBar mainMenu; 
JTextField textMemory; 
JLabel labelMemSpace; //labelMemSpace单纯做摆设，控制面板的形状 
JButton buttonBk, buttonCe, buttonC; 
JButton button[]; 
JButton buttonMC, buttonMR, buttonMS, buttonMAdd; 
JButton buttonDot, buttonAddAndSub, buttonAdd, buttonSub, buttonMul, 
buttonDiv, buttonMod; 
JButton buttonSqrt, buttonDao, buttonEqual; 
JMenu editMenu, viewMenu, helpMenu; 
JMenuItem copyItem, pasteItem, tItem, sItem, numberGroup, topHelp, aboutCal; 
DecimalFormat df; //设置数据输出精度 
boolean clickable; //控制当前能否按键 
double memoryd; //使用内存中存储的数字 
int memoryi; 
double vard, answerd; //用来保存double型数据的中间值(vard)和最后结果(answerd) 
short key = -1, prekey = -1; //key用来保存当前进行何种运算,prekey用来保存前次进行何种运算 
String copy; //做复制用 
JTextArea help; //帮助 
JScrollPane scrollHelp; 
//构造函数 
public Calculator() { 
clickable = true; 
answerd = 0; 
frame = new JFrame("计算器"); 
df = new DecimalFormat("0.##############"); //设置数据输出精度(对于double型值) 
textAnswer = new JTextField(15); 
textAnswer.setText(""); 
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()); 
//设计整个面板 
mainMenu = new JMenuBar(); 
editMenu = new JMenu("编辑(E)"); 
viewMenu = new JMenu("查看(V)"); 
helpMenu = new JMenu("帮助(H)"); 
copyItem = new JMenuItem(" 复制(C) Ctrl+C"); 
copyItem.addActionListener(this); 
pasteItem = new JMenuItem(" 粘贴(V) Ctrl+V"); 
pasteItem.addActionListener(this); 
editMenu.add(copyItem); 
editMenu.add(pasteItem); 
tItem = new JMenuItem("●标准型(T)"); 
tItem.addActionListener(this); 
sItem = new JMenuItem(" 科学型(S)"); 
sItem.addActionListener(this); 
numberGroup = new JMenuItem(" 数字分组(I)"); 
numberGroup.addActionListener(this); 
viewMenu.add(tItem); 
viewMenu.add(sItem); 
viewMenu.add(numberGroup); 
topHelp = new JMenuItem(" 帮助主题(H)"); 
topHelp.addActionListener(this); 
help = new JTextArea(5, 20); 
scrollHelp = new JScrollPane(help); 
help.setEditable(false); 
help.append("执行简单计算\n"); 
help.append("1. 键入计算的第一个数字。\n"); 
help.append("2. 单击“+”执行加、“-”执行减、“*”执行乘或“/”执行除。\n"); 
help.append("3. 键入计算的下一个数字。\n"); 
help.append("4. 输入所有剩余的运算符和数字。\n"); 
help.append("5. 单击“=”。\n"); 
aboutCal = new JMenuItem(" 关于计算器(A)"); 
aboutCal.addActionListener(this); 
helpMenu.add(topHelp); 
helpMenu.add(aboutCal); 
mainMenu.add(editMenu); 
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)); 
//将所有行为与监听绑定 
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(); 
} 
//设置各个按钮行为 
public void actionPerformed(ActionEvent event) { 
boolean sign = false; //判断是否是double型数参与运算，是为true，不是为false 
Object temp = event.getSource(); 
try { 
//如果按下数据按钮，将按下的按钮代表的数据插入的当前文本框字符串之后 
for (int i = 0; i <= 9; i++) 
if (temp == button[i] && clickable == true) 
textAnswer.setText(textAnswer.getText() + Integer.toString(i)); 
//按下'.'按钮时，判断当前文本框内字符串中含不含'.'，如果已含，则不允许再插入'.' 
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) { 
//'+'操作 
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("除数不能为零"); 
clickable = false; 
} 
else 
answerd /= Double.parseDouble(textAnswer.getText()); 
break; 
default: 
answerd = Double.parseDouble(textAnswer.getText()); 
} 
textAnswer.setText(""); 
prekey = key = 0; 
} 
//'-'操作 
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("除数不能为零"); 
clickable = false; 
} 
else 
answerd /= Double.parseDouble(textAnswer.getText()); 
break; 
default: 
answerd = Double.parseDouble(textAnswer.getText()); 
} 
textAnswer.setText(""); 
prekey = key = 1; 
} 
//'*'操作 
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("除数不能为零"); 
clickable = false; 
} 
else 
answerd /= Double.parseDouble(textAnswer.getText()); 
break; 
default: 
answerd = Double.parseDouble(textAnswer.getText()); 
}