javaSwing 计算器代码

package yjq.com.cn;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.ArrayList;
import java.util.EmptyStackException;
import java.util.List;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JSeparator;
import javax.swing.JTextField;
import javax.swing.event.MenuEvent;
import javax.swing.event.MenuListener;
public class MyCaculator implements MenuListener, ActionListener {
JPanel mainp,p1,p2,p3,p4;
JTextField jt1;
JMenuItem mnuCopy;
JMenuItem mnuPaste;
JButton bM;

boolean isDouble = false;// 是否为实数
double op1 = 0, op2 = 0;// 操作数1，操作数2
double n3;
boolean op2IsEmpty = true;
boolean op1IsEmpty = true;
MyStack<Integer> opPool = new MyStack<Integer>();//操作符堆栈

StringBuffer buf = new StringBuffer(20);
StringBuffer copyBoard = new StringBuffer(20);// 剪贴板
StringBuffer memory = new StringBuffer(20);// M系列
StringBuffer str = new StringBuffer();//缓冲器

public MyCaculator()
{
p1=new JPanel();
p1.setLayout(new GridLayout(2,1,10,10));
JMenuBar mnuNotepad=new JMenuBar();
JMenu mnuEdit=new JMenu("编辑(E)");
mnuEdit.setMnemonic(KeyEvent.VK_E);
JMenu mnuCheck=new JMenu("查看(V)");
mnuCheck.setMnemonic(KeyEvent.VK_V);
JMenu mnuHelp=new JMenu("帮助(H)");
mnuCopy=new JMenuItem("复制(C)");
mnuPaste=new JMenuItem("粘贴(P)");
JMenuItem mnuVisit=new JMenuItem("查看帮助(V)");
JMenuItem mnuAbout=new JMenuItem("关于计算器(A)");

JSeparator sep=new JSeparator();
jt1=new JTextField("0.");
jt1.setHorizontalAlignment(JTextField.RIGHT);

jt1.setSelectedTextColor(Color.yellow);
jt1.setEditable(true);

mnuEdit.addMenuListener(this);
mnuCheck.addMenuListener(this);
mnuHelp.addMenuListener(this);
mnuCopy.addActionListener(this);
mnuPaste.addActionListener(this);
mnuVisit.addActionListener(this);
mnuAbout.addActionListener(this);
mnuNotepad.add(mnuEdit);
mnuNotepad.add(mnuCheck);
mnuNotepad.add(mnuHelp);
mnuEdit.add(mnuCopy);
mnuEdit.add(mnuPaste);
mnuEdit.add(sep);
mnuHelp.add(mnuVisit);
mnuHelp.add(sep);
mnuHelp.add(mnuAbout);
p1.add(mnuNotepad);
p1.add(jt1);
p2=new JPanel();
p2.setLayout(new FlowLayout(FlowLayout.CENTER));
bM = new JButton(" ");
bM.setEnabled(false);
p2.add(bM);
JButton b25=new JButton("Backspace");
b25.addActionListener(this);
JButton b26=new JButton("CE");
b26.addActionListener(this);
JButton b27=new JButton("C");
b27.addActionListener(this);
p2.add(b25);
p2.add(b26);
p2.add(b27);
p3=new JPanel();
p3.setLayout(new GridLayout(4,6));

JButton button1=new JButton("MC");
button1.addActionListener(this);
JButton button2=new JButton("7");
button2.addActionListener(this);
JButton button3=new JButton("8");
button3.addActionListener(this);
JButton button4=new JButton("9");
button4.addActionListener(this);
JButton button5=new JButton("/");
button5.addActionListener(this);
JButton button6=new JButton("sqrt");
button6.addActionListener(this);
JButton button7=new JButton("MR");
button7.addActionListener(this);
JButton button8=new JButton("4");
button8.addActionListener(this);
JButton button9=new JButton("5");
button9.addActionListener(this);
JButton button10=new JButton("6");
button10.addActionListener(this);
JButton button11=new JButton("*");
button11.addActionListener(this);
JButton button12=new JButton("%");
button12.addActionListener(this);
JButton button13=new JButton("MS");
button13.addActionListener(this);
JButton button14=new JButton("1");
button14.addActionListener(this);
JButton button15=new JButton("2");
button15.addActionListener(this);
JButton button16=new JButton("3");
button16.addActionListener(this);
JButton button17=new JButton("-");
button17.addActionListener(this);
JButton button18=new JButton("1/x");
button18.addActionListener(this);
JButton button19=new JButton("M+");
button19.addActionListener(this);
JButton button20=new JButton("0");
button20.addActionListener(this);
JButton button21=new JButton("+/-");
button21.addActionListener(this);
JButton button22=new JButton(".");
button22.addActionListener(this);
JButton button23=new JButton("+");
button23.addActionListener(this);
JButton button24=new JButton("=");
button24.addActionListener(this);
p3.add(button1);p3.add(button2);
p3.add(button3);p3.add(button4);
p3.add(button5);p3.add(button6);
p3.add(button7);p3.add(button8);
p3.add(button9);p3.add(button10);
p3.add(button11);p3.add(button12);
p3.add(button13);p3.add(button14);
p3.add(button15);p3.add(button16);
p3.add(button17);p3.add(button18);
p3.add(button19);p3.add(button20);
p3.add(button21);p3.add(button22);
p3.add(button23);p3.add(button24);
p3.setSize(250,250);
mainp=new JPanel();
mainp.setLayout(new GridLayout(3,1));
mainp.add(p1);
mainp.add(p2);
mainp.add(p3);

JFrame f = new JFrame();
f.getContentPane().add(mainp);
f.setTitle("计算器");
f.setSize(350,350);
f.setVisible(true);
f.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}});
}
public void menuCanceled(MenuEvent e) {
}
public void menuDeselected(MenuEvent e) {
}
public void menuSelected(MenuEvent e) {
}
public void actionPerformed(ActionEvent e) {
String s= e.getActionCommand();

if(s.equals("复制(C)")){
String temp = jt1.getText().trim();
copyBoard.replace(0, copyBoard.length(), temp);
}

else if(s.equals("粘贴(P)")){
jt1.setText(copyBoard.toString());
}

else if(s.equals("查看帮助(V)")){

}

else if(s.equals("关于计算器(A)")){
JOptionPane.showMessageDialog(null, "designed by YJQ!");
}

else if(s.equals("Backspace")){
if (!jt1.getText().trim().equals("0.")) {
// 如果文本框中有内容
str.setLength(0);
str.append(jt1.getText().trim());
if (str.length() != 1 && str.length() != 0) {
str.setLength(str.length() - 1);
jt1.setText(str.toString());
}
else {
jt1.setText("0.");
str.setLength(0);
}
}
}
else if(s.equals("CE")){
jt1.setText("0.");
}
else if(s.equals("C")){
isDouble = false;
jt1.setText("0.");
op1 = op2 = 0;
str.replace(0,str.length(),"");
opPool.clear();
op2IsEmpty = true;
op1IsEmpty = true;
}
else if(s.equals("MC")){
// 如果是MC则清除缓冲区
memory.setLength(0);
bM.setText(" ");
}
else if(s.equals("MR")){
// 如果按键为MR则恢复缓冲区的数到文本框
jt1.setText(memory.toString());
}
else if(s.equals("MS")){
// 如果按键为MS则将文本框的数存入缓冲区
try{
n3 = Double.parseDouble(jt1.getText().trim());
memory.setLength(0);
memory.append(n3);
bM.setText("M");
}
catch(Exception ex){
ex.printStackTrace();
JOptionPane.showMessageDialog(null, "文本不是实数，不能被存储！");
};
}

else if(s.equals("M+")){
// 如果按键为MS则将文本框值与缓冲区的数相加但不显示结果
String temp1 = jt1.getText().trim();
double dtemp = Double.parseDouble(temp1);
String temp2 = memory.toString();
dtemp += Double.parseDouble(temp2);
temp1 = String.valueOf(dtemp);
memory.replace(0, memory.length(), temp1);

}
else if(s.equals("sqrt")){
String temp = jt1.getText().trim();
double dtemp = Double.parseDouble(temp);
if(dtemp >= 0){
jt1.setText("" + Math.sqrt(dtemp));
str.setLength(0);
str.append(jt1.getText().trim());
op2 = Double.parseDouble(jt1.getText().trim());
op1 = op2;
op1IsEmpty = false;
op2IsEmpty = true;
}
else{
JOptionPane.showMessageDialog(null, "sqrt的操作数不能为负数");
};
}

else if(s.equals("+/-")){
op2 = Double.parseDouble(jt1.getText().trim());
if(op1IsEmpty) {
op1 = -op2;
op1IsEmpty = false;
op2 = 0;
op2IsEmpty = true;
jt1.setText("" + op1);
}
else{
op2 = -op2;
jt1.setText("" + op2);

}
}

else if(s.equals("%")){
if(isDouble){
n3 = Double.parseDouble(jt1.getText().trim())*100;
jt1.setText(""+n3+"%");
}
}

else if(s.equals("1/x")){
String temp = jt1.getText().trim();
double dtemp = Double.parseDouble(temp);
op2 = dtemp;
if(op2 != 0){
op2 = 1/op2;
str.setLength(0);
str.append("" + op2);
jt1.setText(str.toString());
op1 = op2;
op2IsEmpty = true;
}
else{
JOptionPane.showMessageDialog(null, "1/x的操作数不能为0");
}
}

else if(s.equals("+")){
if(op1IsEmpty) {
op1 = op2;
op1IsEmpty = false;
op2IsEmpty = true;
}
if (opPool.isEmpty()||op2IsEmpty){
opPool.clear();
opPool.push(1);
jt1.setText("" + op1);
}
else {
switch (opPool.pop()) {
case 1:
op1 += op2;
jt1.setText("" + op1);

break;
case 2:
op1 -= op2;
jt1.setText("" + op1);
break;
case 3:
op1 *= op2;
jt1.setText("" + op1);
break;
case 4:
if(op2 != 0) op1 /= op2;
else JOptionPane.showMessageDialog(null, "除数不能为0");
jt1.setText("" + op1);
break;
}
opPool.push(1);
op2IsEmpty= true;
}
str.setLength(0);
}
else if(s.equals("-")){
if(op1IsEmpty&&!op2IsEmpty) {
op1 = op2;
op1IsEmpty = false;
op2 = 0;
op2IsEmpty = true;
}
if (opPool.isEmpty()||op2IsEmpty){
opPool.clear();
opPool.push(2);
jt1.setText("" + op1);
}
else {
switch (opPool.pop()) {
case 1:
op1 += op2;
jt1.setText("" + op1);

break;
case 2:
op1 -= op2;
jt1.setText("" + op1);
break;
case 3:
op1 *= op2;
jt1.setText("" + op1);
break;
case 4:
if(op2 != 0) op1 /= op2;
else JOptionPane.showMessageDialog(null, "除数不能为0");
jt1.setText("" + op1);
break;
}
opPool.push(2);
op2 = 0;
op2IsEmpty = true;
}
str.setLength(0);
}
else if(s.equals("*")){
if(op1IsEmpty&&!op2IsEmpty) {
op1 = op2;
op1IsEmpty = false;
op2 = 0;
op2IsEmpty = true;
}
str.setLength(0);
if (opPool.isEmpty()||op2IsEmpty){
opPool.clear();
opPool.push(3);
jt1.setText("" + op1);
}
else {
switch (opPool.pop()) {
case 1:
op1 += op2;
jt1.setText("" + op1);

break;
case 2:
op1 -= op2;
jt1.setText("" + op1);
break;
case 3:
op1 *= op2;
jt1.setText("" + op1);
break;
case 4:
if(op2 != 0) op1 /= op2;
else JOptionPane.showMessageDialog(null, "除数不能为0");
jt1.setText("" + op1);
break;
}
opPool.push(3);
op2 = 0;
op2IsEmpty = true;
}
str.setLength(0);
}
else if(s.equals("/")){
if(op1IsEmpty&&!op2IsEmpty) {
op1 = op2;
op1IsEmpty = false;
op2 = 0;
op2IsEmpty = true;
}

if (opPool.isEmpty()||op2IsEmpty){
opPool.clear();
opPool.push(4);
jt1.setText("" + op1);
}
else {
switch (opPool.pop()) {
case 1:
op1 += op2;
jt1.setText("" + op1);

break;
case 2:
op1 -= op2;
jt1.setText("" + op1);
break;
case 3:
op1 *= op2;
jt1.setText("" + op1);
break;
case 4:
if(op2 != 0) op1 /= op2;
else JOptionPane.showMessageDialog(null, "除数不能为0");
jt1.setText("" + op1);
break;
}
opPool.push(4);
op2IsEmpty = true;
}
str.setLength(0);
}
else if(s.equals(".")){
if(jt1.getText().trim().indexOf(".") == -1 ){
str.append(s);
jt1.setText(str.toString());
}
isDouble = true;
}

else if(s.equals("=")){
if(op1IsEmpty&&!op2IsEmpty) {
op1 = op2;
op1IsEmpty = false;
op2 = 0;
op2IsEmpty = true;
}
if (opPool.isEmpty()||op2IsEmpty){
opPool.clear();
jt1.setText("" + op1);
}
else {
switch (opPool.pop()) {
case 1:
op1 += op2;
jt1.setText("" + op1);

break;
case 2:
op1 -= op2;
jt1.setText("" + op1);
break;
case 3:
op1 *= op2;
jt1.setText("" + op1);
break;
case 4:
if(op2 != 0) op1 /= op2;
else JOptionPane.showMessageDialog(null, "除数不能为0");
jt1.setText("" + op1);
break;
}
op2 = 0;
op2IsEmpty = true;
}
str.setLength(0);
}

else if (s.equals("0")){  // 如果选择的是"0"这个数字键
if (jt1.getText().trim().equals("0.")) {
str.replace(0,str.length(),"0.");
if(isDouble){ //为浮点数时  0加到   str 中去
jt1.setText(str.append(s).toString());
op2 = Double.parseDouble(str.toString().trim());
op2IsEmpty = false;
}
else{
}
}
else {
jt1.setText(str.append(s).toString());
op2 = Double.parseDouble(str.toString().trim());
op2IsEmpty = false;
}
}

else{
jt1.setText(str.append(s).toString());
op2 = Double.parseDouble(str.toString().trim());
op2IsEmpty = false;
}
}
public static void main(String args[]){
new MyCaculator();
}
}
class MyStack<Object>{
private List<Object> pool= new ArrayList<Object>();

public MyStack(){

}

public void clear() {
pool.clear();
}

public boolean isEmpty(){
return pool.isEmpty();
}
/**
* 获取栈顶元素
* */
public Object  getTopObjcet() {
if (isEmpty()) {return null;}
return pool.get(0);

}
/**
* 弹出栈操作
* */
public Object pop(){
if (isEmpty()) {throw new EmptyStackException();}
return pool.remove(pool.size() - 1);
}

/**
* 压入栈操作
* */
public void push(Object i){
pool.add(i);
}
/**
* 获取当前栈大小
* */
public int getStackSize(){
if (isEmpty()) {throw new EmptyStackException();}
return pool.size();
}
}