Java实现的计算器(完整源码)

import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.regex.Pattern;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.WindowConstants;

public class Calculator extends JFrame {

private JTextField jt = new JTextField(250);

double a;
double b;
boolean isRun = false;
String s = "";
String num = "";
String run = null;

public Calculator(){

setLayout(null);
setBounds(0,0,300,300);
Container c = getContentPane();

//添加组件
jt.setBounds(5,5,285,30);
c.add(jt);
jt.setText(null);

JButton b1 = new JButton("7");
JButton b2 = new JButton("8");
JButton b3 = new JButton("9");
JButton b4 = new JButton("4");
JButton b5 = new JButton("5");
JButton b6 = new JButton("6");
JButton b7 = new JButton("1");
JButton b8 = new JButton("2");
JButton b9 = new JButton("3");
JButton b10 = new JButton(".");
JButton b11 = new JButton("0");
JButton b12 = new JButton("");
JButton b13 = new JButton("+");
JButton b14 = new JButton("-");
JButton b15 = new JButton("*");
JButton b16 = new JButton("/");
JButton b17 = new JButton("C");
JButton b18 = new JButton("x!");
JButton b19 = new JButton("x");
JButton b20 = new JButton("=");

b1.setBounds(10, 50, 50, 30);
b2.setBounds(65, 50, 50, 30);
b3.setBounds(120, 50, 50, 30);
b4.setBounds(10, 85, 50, 30);
b5.setBounds(65, 85, 50, 30);
b6.setBounds(120, 85, 50, 30);
b7.setBounds(10, 120, 50, 30);
b8.setBounds(65, 120, 50, 30);
b9.setBounds(120, 120, 50, 30);
b10.setBounds(10, 155, 50, 30);
b11.setBounds(65, 155, 50, 30);
b12.setBounds(120, 155, 50, 30);
b13.setBounds(180, 50, 50, 30);
b14.setBounds(180, 85, 50, 30);
b15.setBounds(180, 120, 50, 30);
b16.setBounds(180, 155, 50, 30);
b17.setBounds(235, 50, 50, 30);
b18.setBounds(235, 85, 50, 30);
b19.setBounds(235, 120, 50, 30);
b20.setBounds(235, 155, 50, 30);

c.add(b1);
c.add(b2);
c.add(b3);
c.add(b4);
c.add(b5);
c.add(b6);
c.add(b7);
c.add(b8);
c.add(b9);
c.add(b10);
c.add(b11);
c.add(b12);
c.add(b13);
c.add(b14);
c.add(b15);
c.add(b16);
c.add(b17);
c.add(b18);
c.add(b19);
c.add(b20);

//按钮事件
//数字
////////////////////////////////////////////////////////////
b1.addActionListener(new ActionListener(){

@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub

jt.setText("7");
num = num+jt.getText();
jt.setText(num);

jt.requestFocus();
}
});
b2.addActionListener(new ActionListener(){

@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub

jt.setText("8");
num = num+jt.getText();
jt.setText(num);

jt.requestFocus();
}
});
b3.addActionListener(new ActionListener(){

@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub

jt.setText("9");
num = num+jt.getText();
jt.setText(num);

jt.requestFocus();
}
});
b4.addActionListener(new ActionListener(){

@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub

jt.setText("4");
num = num+jt.getText();
jt.setText(num);

jt.requestFocus();
}
});
b5.addActionListener(new ActionListener(){

@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub

jt.setText("5");
num = num+jt.getText();
jt.setText(num);

jt.requestFocus();
}
});
b6.addActionListener(new ActionListener(){

@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub

jt.setText("6");
num = num+jt.getText();
jt.setText(num);

jt.requestFocus();
}
});
b7.addActionListener(new ActionListener(){

@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub

jt.setText("1");
num = num+jt.getText();
jt.setText(num);

jt.requestFocus();
}
});
b8.addActionListener(new ActionListener(){

@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub

jt.setText("2");
num = num+jt.getText();
jt.setText(num);

jt.requestFocus();
}
});
b9.addActionListener(new ActionListener(){

@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub

jt.setText("3");
num = num+jt.getText();
jt.setText(num);

jt.requestFocus();
}
});
b10.addActionListener(new ActionListener(){

@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
if(jt.getText()!=null){
jt.setText(".");
num = num+jt.getText();
jt.setText(num);
}else{
JOptionPane.showMessageDialog(null,"第一位数字不能是小数点");
}

jt.requestFocus();
}
});
b11.addActionListener(new ActionListener(){

@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub

jt.setText("0");
num = num+jt.getText();
jt.setText(num);

jt.requestFocus();
}
});

/////////////////////////////////////////////////////////////////
//运算符
/////////////////////////////////////////////////////////////////
b13.addActionListener(new ActionListener(){

@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
if(!isRun){
jt.setText("+");
s = num;
num="";
run = "+";
}else{
//jt.setText(Double.toString(a));
if(run.equals("+")){
b = Double.valueOf(s)+Double.valueOf(num);
s = Double.toString(b);
jt.setText(s);
num = "";
run = "+";
}else if(run.equals("-")){
b = Double.valueOf(s)-Double.valueOf(num);
s = Double.toString(b);
jt.setText(s);
num = "";
run = "+";
}else if(run.equals("*")){
b = Double.valueOf(s)*Double.valueOf(num);
s = Double.toString(b);
jt.setText(s);
num = "";
run = "+";
}else if(run.equals("/")){
b = Double.valueOf(s)/Double.valueOf(num);
s = Double.toString(b);
jt.setText(s);
num = "";
run = "+";
}else if(run.equals("^")){
b = Math.pow(Double.valueOf(s),Double.valueOf(num));
s = Double.toString(b);
jt.setText(s);
num = "";
run = "+";
}else if(run.equals("=")){
jt.setText("+");
s = Double.toString(a);
num = "";
run = "+";
}
}

isRun = true;

jt.requestFocus();
}
});
b14.addActionListener(new ActionListener(){

@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
if(!isRun){
jt.setText("-");
s = num;
num="";
run = "-";
}else{
if(run.equals("+")){
b = Double.valueOf(s)+Double.valueOf(num);
s = Double.toString(b);
jt.setText(s);
num = "";
run = "-";
}else if(run.equals("-")){
b = Double.valueOf(s)-Double.valueOf(num);
s = Double.toString(b);
jt.setText(s);
num = "";
run = "-";
}else if(run.equals("*")){
b = Double.valueOf(s)*Double.valueOf(num);
s = Double.toString(b);
jt.setText(s);
num = "";
run = "-";
}else if(run.equals("/")){
b = Double.valueOf(s)/Double.valueOf(num);
s = Double.toString(b);
jt.setText(s);
num = "";
run = "-";
}else if(run.equals("^")){
b = Math.pow(Double.valueOf(s),Double.valueOf(num));
s = Double.toString(b);
jt.setText(s);
num = "";
run = "-";
}else if(run.equals("=")){
jt.setText("-");
s = Double.toString(a);
num = "";
run = "-";
}
}
isRun = true;

jt.requestFocus();
}
});
b15.addActionListener(new ActionListener(){

@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
if(!isRun){
jt.setText("*");
s = num;
num="";
run = "*";
}else{
//JOptionPane.showMessageDialog(null, "不能连续输入运算符");
if(run.equals("+")){
b = Double.valueOf(s)+Double.valueOf(num);
s = Double.toString(b);
jt.setText(s);
num = "";
run = "*";
}else if(run.equals("-")){
b = Double.valueOf(s)-Double.valueOf(num);
s = Double.toString(b);
jt.setText(s);
num = "";
run = "*";
}else if(run.equals("*")){
b = Double.valueOf(s)*Double.valueOf(num);
s = Double.toString(b);
jt.setText(s);
num = "";
run = "*";
}else if(run.equals("/")){
b = Double.valueOf(s)/Double.valueOf(num);
s = Double.toString(b);
jt.setText(s);
num = "";
run = "*";
}else if(run.equals("^")){
b = Math.pow(Double.valueOf(s),Double.valueOf(num));
s = Double.toString(b);
jt.setText(s);
num = "";
run = "*";
}else if(run.equals("=")){
jt.setText("*");
s = Double.toString(a);
num = "";
run = "*";
}
}
isRun = true;

jt.requestFocus();
}
});
b16.addActionListener(new ActionListener(){

@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
if(!isRun){
jt.setText("/");
s = num;
num="";
run = "/";
}else{
//JOptionPane.showMessageDialog(null, "不能连续输入运算符");
if(run.equals("+")){
b = Double.valueOf(s)+Double.valueOf(num);
s = Double.toString(b);
jt.setText(s);
num = "";
run = "/";
}else if(run.equals("-")){
b = Double.valueOf(s)-Double.valueOf(num);
s = Double.toString(b);
jt.setText(s);
num = "";
run = "/";
}else if(run.equals("*")){
b = Double.valueOf(s)*Double.valueOf(num);
s = Double.toString(b);
jt.setText(s);
num = "";
run = "/";
}else if(run.equals("/")){
b = Double.valueOf(s)/Double.valueOf(num);
s = Double.toString(b);
jt.setText(s);
num = "";
run = "/";
}else if(run.equals("^")){
b = Math.pow(Double.valueOf(s),Double.valueOf(num));
s = Double.toString(b);
jt.setText(s);
num = "";
run = "/";
}else if(run.equals("=")){
jt.setText("/");
s = Double.toString(a);
num = "";
run = "/";
}
}
isRun = true;

jt.requestFocus();
}
});
//阶乘
b18.addActionListener(new ActionListener(){

@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
if(!isRun){
s = num;
double c;
c = Double.valueOf(s);
if(((c%2==0)||(c%2==1))&&c>0){
jt.setText("x!");
num="";
run = "x!";
}else{
JOptionPane.showMessageDialog(null, "非正整数不能进行阶乘运算");
}

}else{
//JOptionPane.showMessageDialog(null, "不能连续输入运算符");
if(run.equals("=")){
//System.out.println(a);//测试
if(((a%2==0)||(a%2==1))&&a>0){
jt.setText("x!");
s = Double.toString(a);
num = "";
run = "x!";
System.out.println(s);//测试
}else{
JOptionPane.showMessageDialog(null,"非正整数不能进行阶乘运算");
}

}

}
isRun = true;

jt.requestFocus();
}
});
//指数运算
b19.addActionListener(new ActionListener(){

@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
if(!isRun){
jt.setText("^");
s = num;
num="";
run = "^";
}else{
//JOptionPane.showMessageDialog(null, "不能连续输入运算符");
if(run.equals("+")){
b = Double.valueOf(s)+Double.valueOf(num);
s = Double.toString(b);
jt.setText(s);
num = "";
run = "^";
}else if(run.equals("-")){
b = Double.valueOf(s)-Double.valueOf(num);
s = Double.toString(b);
jt.setText(s);
num = "";
run = "^";
}else if(run.equals("*")){
b = Double.valueOf(s)*Double.valueOf(num);
s = Double.toString(b);
jt.setText(s);
num = "";
run = "^";
}else if(run.equals("/")){
b = Double.valueOf(s)/Double.valueOf(num);
s = Double.toString(b);
jt.setText(s);
num = "";
run = "^";
}else if(run.equals("=")){
jt.setText("^");
s = Double.toString(a);
num = "";
run = "^";
}
}
isRun = true;

jt.requestFocus();
}
});

//等于
b20.addActionListener(new ActionListener(){

@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
if(run.equals("+")){
a = Double.valueOf(s)+Double.valueOf(num);
}else if(run.equals("-")){
a = Double.valueOf(s)-Double.valueOf(num);
}else if(run.equals("*")){
a = Double.valueOf(s)*Double.valueOf(num);
}else if(run.equals("/")){
a = Double.valueOf(s)/Double.valueOf(num);
}else if(run.equals("x!")){
//                  double check = Double.parseDouble(s);
//                  check = (int)check;
//                  int c,result;
//                  int d = (int)check;
double c,result;
double d = Double.valueOf(s);
result = c = d;
for(int i=1;i<d;i++){
result = result*(c-i);
}
a = result;
}else if(run.equals("^")){
a = Math.pow(Double.valueOf(s),Double.valueOf(num));
//a = Double.valueOf(s)^Double.valueOf(num);
}

jt.setText(Double.toString(a));
isRun = true;
run = "=";

jt.requestFocus();
}
});
/////////////////////////////////////////////////////////////////
//归零
b17.addActionListener(new ActionListener(){

@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
jt.setText("");
num = "";
s = "";
isRun = false;
run = null;

jt.requestFocus();
}
});
}
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub

init(new Calculator(),310,250);
}

private static void init(Calculator frame, int width, int height) {
// TODO Auto-generated method stub
frame.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
frame.setSize(width,height);
frame.setTitle("计算器");
frame.setVisible(true);
}
}