java 计算器代码

java 计算器代码

这个是最合适你了！

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Calculator extends JFrame {

private Container container;
private GridBagLayout layout;
private GridBagConstraints constraints;
private JTextField displayField;//计算结果显示区
private String lastCommand;//保存+,-,*,/,=命令
private double result;//保存计算结果
private boolean start;//判断是否为数字的开始

public Calculator() {

super("计算器");
container=getContentPane();
layout=new GridBagLayout();
container.setLayout(layout);
constraints=new GridBagConstraints();
start=true;
result=0;
lastCommand = "=";
displayField=new JTextField(20);
displayField.setText("0.0");
displayField.setcolor(red);
displayField.setHorizontalAlignment(JTextField.RIGHT);
constraints.gridx=0;
constraints.gridy=0;
constraints.gridwidth=4;
constraints.gridheight=1;
constraints.fill=GridBagConstraints.BOTH;
constraints.weightx=100;
constraints.weighty=100;
layout.setConstraints(displayField,constraints);
container.add(displayField);
ActionListener insert = new InsertAction();
ActionListener command = new CommandAction();
addButton("7",0,2,1,1,insert);
addButton("8",1,2,1,1,insert);
addButton("9",2,2,1,1,insert);
addButton("/",3,5,1,1,command);
addButton("4",0,3,1,1,insert);
addButton("5",1,3,1,1,insert);
addButton("6",2,3,1,1,insert);
addButton("*",3,4,1,1,command);
addButton("1",0,4,1,1,insert);
addButton("2",1,4,1,1,insert);
addButton("3",2,4,1,1,insert);
addButton("-",3,3,1,1,command);
addButton("0",1,5,1,1,insert);
addButton("=",2,5,1,1,command);
addButton(".",0,5,1,1,insert);
addButton("+",3,2,1,1,command);
setSize(180,200);
setVisible(true);

}

private void addButton(String label,int row,int column,int with,int height,ActionListener listener) {

JButton button=new JButton(label);
constraints.gridx=row;
constraints.gridy=column;
constraints.gridwidth=with;
constraints.gridheight=height;
constraints.fill=GridBagConstraints.BOTH;
button.addActionListener(listener);
layout.setConstraints(button,constraints);
container.add(button);
}

private class InsertAction implements ActionListener {

public void actionPerformed(ActionEvent event) {

String input=event.getActionCommand();
if (start) {
displayField.setText("");
start=false;
displayField.setText(displayField.getText()+input);
}
}
}

private class CommandAction implements ActionListener {

public void actionPerformed(ActionEvent evt) {
String command=evt.getActionCommand();
if(start) {
lastCommand=command;
}else {
calculate(Double.parseDouble(displayField.getText()));
lastCommand=command;
start=true;
}
}
}

public void calculate(double x) {
if (lastCommand.equals("+")) result+= x;
else if (lastCommand.equals("-")) result-=x;
else if (lastCommand.equals("*")) result*=x;
else if (lastCommand.equals("/")) result/=x;
else if (lastCommand.equals("=")) result=x;
displayField.setText(""+ result);
}

public static void main(String []args) {
Calculator calculator=new Calculator();
calculator.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

}2008-01-06

/*
* @(#)JCalculator.java 1.00 12/29/2009
*
* Email: light_warm@163.com
*/

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

/**
* A simple calculator program.
* <p>I saw this program in a QQ group, and help a friend correct it.</p>
*
* @author Singyuen Yip
* @version 1.00 12/29/2009
* @see JFrame
* @see ActionListener
*/
public class JCalculator extends JFrame implementsActionListener {
/**
* Serial Version UID
*/
private static final long serialVersionUID = -169068472193786457L;
/**
* This class help close the Window.
* @author Singyuen Yip
*
*/
private class WindowCloser extends WindowAdapter {
public void windowClosing(WindowEvent we) {
System.exit(0);
}
}

int i;
// Strings for Digit & Operator buttons.
private final String[] str = { "7", "8", "9", "/", "4","5", "6", "*", "1",
"2", "3", "-", ".", "0", "=", "+" };
// Build buttons.
JButton[] buttons = new JButton[str.length];
// For cancel or reset.
JButton reset = new JButton("CE");
// Build the text field to show the result.
JTextField display = new JTextField("0");

/**
* Constructor without parameters.
*/
public JCalculator() {
super("Calculator");
// Add a panel.
JPanel panel1 = new JPanel(new GridLayout(4, 4));
// panel1.setLayout(new GridLayout(4,4));
for (i = 0; i < str.length; i++) {
buttons[i] = new JButton(str[i]);
panel1.add(buttons[i]);
}
JPanel panel2 = new JPanel(new BorderLayout());
// panel2.setLayout(new BorderLayout());
panel2.add("Center", display);
panel2.add("East", reset);
// JPanel panel3 = new Panel();
getContentPane().setLayout(new BorderLayout());
getContentPane().add("North", panel2);
getContentPane().add("Center", panel1);
// Add action listener for each digit & operator button.
for (i = 0; i < str.length; i++)
buttons[i].addActionListener(this);
// Add listener for "reset" button.
reset.addActionListener(this);
// Add listener for "display" button.
display.addActionListener(this);
// The "close" button "X".
addWindowListener(new WindowCloser());
// Initialize the window size.
setSize(800, 800);
// Show the window.
// show(); Using show() while JDK version is below 1.5.
setVisible(true);
// Fit the certain size.
pack();
}

public void actionPerformed(ActionEvent e) {
Object target = e.getSource();
String label = e.getActionCommand();
if (target == reset)
handleReset();
else if ("0123456789.".indexOf(label) > 0)
handleNumber(label);
else
handleOperator(label);
}
// Is the first digit pressed?
boolean isFirstDigit = true;
/**
* Number handling.
* @param key the key of the button.
*/
public void handleNumber(String key) {
if (isFirstDigit)
display.setText(key);
else if ((key.equals(".")) && (display.getText().indexOf(".") < 0))
display.setText(display.getText() + ".");
else if (!key.equals("."))
display.setText(display.getText() + key);
isFirstDigit = false;
}

/**
* Reset the calculator.
*/
public void handleReset() {
display.setText("0");
isFirstDigit = true;
operator = "=";
}

double number = 0.0;
String operator = "=";

/**
* Handling the operation.
* @param key pressed operator's key.
*/
public void handleOperator(String key) {
if (operator.equals("+"))
number += Double.valueOf(display.getText());
else if (operator.equals("-"))
number -= Double.valueOf(display.getText());
else if (operator.equals("*"))
number *= Double.valueOf(display.getText());
else if (operator.equals("/"))
number /= Double.valueOf(display.getText());
else if (operator.equals("="))
number = Double.valueOf(display.getText());
display.setText(String.valueOf(number));
operator = key;
isFirstDigit = true;
}

public static void main(String[] args) {
new JCalculator();
}
}2015-12-17

这个代码很多人要，我也发了好多次了
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Calculator extends JFrame {

private Container container;
private GridBagLayout layout;
private GridBagConstraints constraints;
private JTextField displayField;//计算结果显示区
private String lastCommand;//保存+,-,*,/,=命令
private double result;//保存计算结果
private boolean start;//判断是否为数字的开始

public Calculator() {

super("Calculator");
container=getContentPane();
layout=new GridBagLayout();
container.setLayout(layout);
constraints=new GridBagConstraints();
start=true;
result=0;
lastCommand = "=";
displayField=new JTextField(20);
displayField.setHorizontalAlignment(JTextField.RIGHT);
constraints.gridx=0;
constraints.gridy=0;
constraints.gridwidth=4;
constraints.gridheight=1;
constraints.fill=GridBagConstraints.BOTH;
constraints.weightx=100;
constraints.weighty=100;
layout.setConstraints(displayField,constraints);
container.add(displayField);
ActionListener insert = new InsertAction();
ActionListener command = new CommandAction();
addButton("Backspace",0,1,2,1,insert);
addButton("CE",2,1,1,1,insert);
addButton("C",3,1,1,1,insert);
addButton("7",0,2,1,1,insert);
addButton("8",1,2,1,1,insert);
addButton("9",2,2,1,1,insert);
addButton("/",3,2,1,1,command);
addButton("4",0,3,1,1,insert);
addButton("5",1,3,1,1,insert);
addButton("6",2,3,1,1,insert);
addButton("*",3,3,1,1,command);
addButton("1",0,4,1,1,insert);
addButton("2",1,4,1,1,insert);
addButton("3",2,4,1,1,insert);
addButton("-",3,4,1,1,command);
addButton("0",0,5,1,1,insert);
addButton("+/-",1,5,1,1,insert);//只显示"-"号,"+"没有实用价值
addButton(".",2,5,1,1,insert);
addButton("+",3,5,1,1,command);
addButton("=",0,6,4,1,command);
setSize(300,300);
setVisible(true);

}

private void addButton(String label,int row,int column,int with,int height,ActionListener listener) {

JButton button=new JButton(label);
constraints.gridx=row;
constraints.gridy=column;
constraints.gridwidth=with;
constraints.gridheight=height;
constraints.fill=GridBagConstraints.BOTH;
button.addActionListener(listener);
layout.setConstraints(button,constraints);
container.add(button);
}

private class InsertAction implements ActionListener {

public void actionPerformed(ActionEvent event) {

String input=event.getActionCommand();
if (start) {
displayField.setText("");
start=false;
if(input.equals("+/-"))
displayField.setText(displayField.getText()+"-");
}

if(!input.equals("+/-")) {
if(input.equals("Backspace")) {
String str=displayField.getText();
if(str.length()>0)
displayField.setText(str.substring(0,str.length()-1));
}else if(input.equals("CE")||input.equals("C")) {
displayField.setText("0");
start=true;
}else
displayField.setText(displayField.getText()+input);
}
}
}

private class CommandAction implements ActionListener {

public void actionPerformed(ActionEvent evt) {
String command=evt.getActionCommand();
if(start) {
lastCommand=command;
}else {
calculate(Double.parseDouble(displayField.getText()));
lastCommand=command;
start=true;
}
}
}

public void calculate(double x) {
if (lastCommand.equals("+")) result+= x;
else if (lastCommand.equals("-")) result-=x;
else if (lastCommand.equals("*")) result*=x;
else if (lastCommand.equals("/")) result/=x;
else if (lastCommand.equals("=")) result=x;
displayField.setText(""+ result);
}

public static void main(String []args) {
Calculator calculator=new Calculator();
calculator.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

}2008-01-03

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Calculator extends JFrame {

private Container container;
private GridBagLayout layout;
private GridBagConstraints constraints;
private JTextField displayField;//计算结果显示区
private String lastCommand;//保存+,-,*,/,=命令
private double result;//保存计算结果
private boolean start;//判断是否为数字的开始

public Calculator() {

super("Calculator");
container=getContentPane();
layout=new GridBagLayout();
container.setLayout(layout);
constraints=new GridBagConstraints();
start=true;
result=0;
lastCommand = "=";
displayField=new JTextField(20);
displayField.setHorizontalAlignment(JTextField.RIGHT);
constraints.gridx=0;
constraints.gridy=0;
constraints.gridwidth=4;
constraints.gridheight=1;
constraints.fill=GridBagConstraints.BOTH;
constraints.weightx=100;
constraints.weighty=100;
layout.setConstraints(displayField,constraints);
container.add(displayField);
ActionListener insert = new InsertAction();
ActionListener command = new CommandAction();
addButton("Backspace",0,1,2,1,insert);
addButton("CE",2,1,1,1,insert);
addButton("C",3,1,1,1,insert);
addButton("7",0,2,1,1,insert);
addButton("8",1,2,1,1,insert);
addButton("9",2,2,1,1,insert);
addButton("/",3,2,1,1,command);
addButton("4",0,3,1,1,insert);
addButton("5",1,3,1,1,insert);
addButton("6",2,3,1,1,insert);
addButton("*",3,3,1,1,command);
addButton("1",0,4,1,1,insert);
addButton("2",1,4,1,1,insert);
addButton("3",2,4,1,1,insert);
addButton("-",3,4,1,1,command);
addButton("0",0,5,1,1,insert);
addButton("+/-",1,5,1,1,insert);//只显示"-"号,"+"没有实用价值
addButton(".",2,5,1,1,insert);
addButton("+",3,5,1,1,command);
addButton("=",0,6,4,1,command);
setSize(300,300);
setVisible(true);

}

private void addButton(String label,int row,int column,int with,int height,ActionListener listener) {

JButton button=new JButton(label);
constraints.gridx=row;
constraints.gridy=column;
constraints.gridwidth=with;
constraints.gridheight=height;
constraints.fill=GridBagConstraints.BOTH;
button.addActionListener(listener);
layout.setConstraints(button,constraints);
container.add(button);
}

private class InsertAction implements ActionListener {

public void actionPerformed(ActionEvent event) {

String input=event.getActionCommand();
if (start) {
displayField.setText("");
start=false;
if(input.equals("+/-"))
displayField.setText(displayField.getText()+"-");
}

if(!input.equals("+/-")) {
if(input.equals("Backspace")) {
String str=displayField.getText();
if(str.length()>0)
displayField.setText(str.substring(0,str.length()-1));
}else if(input.equals("CE")||input.equals("C")) {
displayField.setText("0");
start=true;
}else
displayField.setText(displayField.getText()+input);
}
}
}

private class CommandAction implements ActionListener {

public void actionPerformed(ActionEvent evt) {
String command=evt.getActionCommand();
if(start) {
lastCommand=command;
}else {
calculate(Double.parseDouble(displayField.getText()));
lastCommand=command;
start=true;
}
}
}

public void calculate(double x) {
if (lastCommand.equals("+")) result+= x;
else if (lastCommand.equals("-")) result-=x;
else if (lastCommand.equals("*")) result*=x;
else if (lastCommand.equals("/")) result/=x;
else if (lastCommand.equals("=")) result=x;
displayField.setText(""+ result);
}

public static void main(String []args) {
Calculator calculator=new Calculator();
calculator.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

}2008-01-02

java计算器
import java.awt.*;
import java.awt.event.*;
public class Calculation extends WindowAdapter implements ActionListener
{
double dResult=0;
double dNowInput=0;
double dMemory;
int n=0; //记载小数位数
int nOperation=1; // 记录运算符类型
int nBitsNum=0; //记录总共输入的位数
boolean alreadyHaveDot=false; //已经有小数点？
boolean keyAvailable=true;
boolean alreadyClickedEqueal=false; //是否按下过"="?
boolean isTempNowInput=false; //是否在计算出结果后直接按运算符将结果赋给了当前输入值？

Frame f;
Panel p1,p2,p3,p4,p5,p6;
TextField tf1,tf2;
Button b1,b2,b3,b4,b5,b6,b7,b8,b9,b0;
Button bDiv,bSqrt,bMulti,bMinus,bPercent,bPlus,bReciprocal,bEqual,bDot,bNegative;
Button bBackspace,bCE,bC,bMR,bMS,bMC,bM;

java计算器
import java.awt.*;
import java.awt.event.*;
public class Calculation extends WindowAdapter implements ActionListener
{
double dResult=0;
double dNowInput=0;
double dMemory;
int n=0; //记载小数位数
int nOperation=1; // 记录运算符类型
int nBitsNum=0; //记录总共输入的位数
boolean alreadyHaveDot=false; //已经有小数点？
boolean keyAvailable=true;
boolean alreadyClickedEqueal=false; //是否按下过"="?
boolean isTempNowInput=false; //是否在计算出结果后直接按运算符将结果赋给了当前输入值？

Frame f;
Panel p1,p2,p3,p4,p5,p6;
TextField tf1,tf2;
Button b1,b2,b3,b4,b5,b6,b7,b8,b9,b0;
Button bDiv,bSqrt,bMulti,bMinus,bPercent,bPlus,bReciprocal,bEqual,bDot,bNegative;
Button bBackspace,bCE,bC,bMR,bMS,bMC,bM;

public void display()
{
f=new Frame("计算器");
f.setSize(280,213);
f.setLocation(200,200);
f.setBackground(Color.LIGHT_GRAY);
f.setResizable(false);

f.setLayout(new BorderLayout(3,3));

p1=new Panel(new GridLayout(1,3,5,5)); //用于存放backspace,ce,c三键
p2=new Panel(new GridLayout(4,5,5,5)); //用于存放数字区及附近共20键, 此处间隙设置可能不合理，以后调整
p3=new Panel(new GridLayout(5,1,5,5)); //用于存放MC,MR,MS,M+键及显示M状态文本框,此处间隙设置可能不合理，以后调整
p4=new Panel(new FlowLayout()); //用于存放p1,p2
p5=new Panel(new FlowLayout());
p6=new Panel(new FlowLayout());
p4.add(p1);
p4.add(p2);

tf1=new TextField(35); //存放显示区
tf1.setText("0.");
tf1.setEditable(false);
p5.add(tf1);
f.add(p5,BorderLayout.NORTH);
f.add(p4,BorderLayout.CENTER);
f.add(p3,BorderLayout.WEST);

b1=new Button("1");
b2=new Button("2");
b3=new Button("3");
b4=new Button("4");
b5=new Button("5");
b6=new Button("6");
b7=new Button("7");
b8=new Button("8");
b9=new Button("9");
b0=new Button("0");

b1.addActionListener(this);
b2.addActionListener(this);
b3.addActionListener(this);
b4.addActionListener(this);
b5.addActionListener(this);
b6.addActionListener(this);
b7.addActionListener(this);
b8.addActionListener(this);
b9.addActionListener(this);
b0.addActionListener(this);

bDiv=new Button("/");
bSqrt=new Button("sqrt");
bMulti=new Button("*");
bMinus=new Button("-");
bPercent=new Button("%");
bPlus=new Button("+");
bReciprocal=new Button("1/x");
bEqual=new Button("=");
bDot=new Button(".");
bNegative=new Button("+/-");

bDiv.addActionListener(this);
bSqrt.addActionListener(this);
bMulti.addActionListener(this);
bMinus.addActionListener(this);
bPercent.addActionListener(this);
bPlus.addActionListener(this);
bReciprocal.addActionListener(this);
bEqual.addActionListener(this);
bDot.addActionListener(this);
bNegative.addActionListener(this);

p2.add(b7);
p2.add(b8);
p2.add(b9);
p2.add(bDiv);
p2.add(bSqrt);
p2.add(b4);
p2.add(b5);
p2.add(b6);
p2.add(bMulti);
p2.add(bPercent);
p2.add(b1);
p2.add(b2);
p2.add(b3);
p2.add(bMinus);
p2.add(bReciprocal);
p2.add(b0);
p2.add(bNegative);
p2.add(bDot);
p2.add(bPlus);
p2.add(bEqual);

bBackspace=new Button("Backspace");
bCE=new Button("CE");
bC=new Button("C");

bBackspace.addActionListener(this);
bCE.addActionListener(this);
bC.addActionListener(this);

p1.add(bBackspace);
p1.add(bCE);
p1.add(bC);

tf2=new TextField(2);
tf2.setEnabled(false);
tf2.setBackground(Color.LIGHT_GRAY);
bMC=new Button("MC");
bMR=new Button("MR");
bMS=new Button("MS");
bM=new Button("M+");

bMC.addActionListener(this);
bMR.addActionListener(this);
bMS.addActionListener(this);
bM.addActionListener(this);

p6.add(tf2);
p3.add(p6);
p3.add(bMC);
p3.add(bMR);
p3.add(bMS);
p3.add(bM);

f.setVisible(true);
f.addWindowListener(this);

}
public void actionPerformed(ActionEvent e)
{
//key 0 to 9
if(this.keyAvailable && e.getActionCommand().length()==1 && e.getActionCommand().compareTo("0")>=0 && e.getActionCommand().compareTo("9")<=0)
{
if(this.isTempNowInput)
{
this.dNowInput=0;
this.isTempNowInput=false;
}
this.nBitsNum++;
if(this.alreadyHaveDot==false)
this.dNowInput=this.dNowInput*10+Double.parseDouble(e.getActionCommand());
else
{
double temp=Double.parseDouble(e.getActionCommand());
for(int i=this.n;i<0;i++)
{
temp*=0.1;
}
this.dNowInput+=temp;
this.n--;
}
this.tf1.setText(Double.toString(this.dNowInput));
}
// key dot
if(this.keyAvailable && e.getActionCommand()==".")
{
if(this.alreadyHaveDot==false)
{
this.nBitsNum++;
this.alreadyHaveDot=true;
this.n=-1;
}
}
//key "+","-","*","/"
if(this.keyAvailable && e.getActionCommand()=="+" || e.getActionCommand()=="-" || e.getActionCommand()=="*" || e.getActionCommand()=="/")
{
if(this.alreadyClickedEqueal)
{
this.dNowInput=this.dResult;
this.isTempNowInput=true;
}
else
{
switch(this.nOperation)
{
case 1: this.dResult+=this.dNowInput; break;
case 2: this.dResult-=this.dNowInput; break;
case 3: this.dResult*=this.dNowInput; break;
case 4:
{
if(this.dNowInput==0)
{
tf1.setText("除数不能为零");
this.keyAvailable=false;
}
else this.dResult=this.dResult/this.dNowInput;
}
}
if(this.keyAvailable)tf1.setText(Double.toString(this.dResult));
this.dNowInput=0;
}
if(e.getActionCommand()=="+")
{
this.nOperation=1;
}
if(e.getActionCommand()=="-")
{
this.nOperation=2;
}
if(e.getActionCommand()=="*")
{
this.nOperation=3;
}
if(e.getActionCommand()=="/")
{
this.nOperation=4;
}
this.nBitsNum=0;
this.alreadyClickedEqueal=false;
}
// key "+/-"
if(this.keyAvailable && e.getActionCommand()=="+/-")
{
this.dNowInput=0-this.dNowInput;
tf1.setText(Double.toString(this.dNowInput));
}
// key "C"
if(e.getActionCommand()=="C")
{
this.nBitsNum=0;
this.dResult=0;
this.dNowInput=0;
this.alreadyHaveDot=false;
this.n=0;
this.nOperation=1;
this.keyAvailable=true;
this.alreadyClickedEqueal=false;
tf1.setText("0.");
}
// key "CE"
if(e.getActionCommand()=="CE")
{
this.nBitsNum=0;
this.dNowInput=0;
this.alreadyHaveDot=false;
this.n=0;
this.nOperation=1;
this.keyAvailable=true;
tf1.setText("0.");
}

// key "sqrt"
if(this.keyAvailable && e.getActionCommand()=="sqrt")
{
if(this.alreadyClickedEqueal)
{
if(this.dResult>=0)
{
this.dResult=Math.sqrt(this.dResult);
tf1.setText(Double.toString(this.dResult));
}
else
{
tf1.setText("函数输入无效");
this.keyAvailable=false;
}
}
else
{
if(this.dNowInput>=0)
{
this.dNowInput=Math.sqrt(this.dNowInput);
tf1.setText(Double.toString(this.dNowInput));
}
else
{
tf1.setText("函数输入无效");
this.keyAvailable=false;
}
}
}
// key "1/x"
if(this.keyAvailable && e.getActionCommand()=="1/x")
{
if(this.dNowInput==0)
{
tf1.setText("除数不能为零");
this.keyAvailable=false;
}
else
{
this.dNowInput=1/this.dNowInput;
tf1.setText(Double.toString(this.dNowInput));
}
}
// key "="
if(this.keyAvailable && e.getActionCommand()=="=")
{
this.alreadyClickedEqueal=true;
switch(this.nOperation)
{
case 1: this.dResult+=this.dNowInput; break;
case 2: this.dResult-=this.dNowInput; break;
case 3: this.dResult*=this.dNowInput; break;
case 4:
{
if(this.dNowInput==0)
{
tf1.setText("除数不能为零");
this.keyAvailable=false;
}
else this.dResult=this.dResult/this.dNowInput;
}
}
if(this.keyAvailable)tf1.setText(Double.toString(this.dResult));
}
// key "MS"
if(this.keyAvailable && e.getActionCommand()=="MS")
{
this.dMemory=this.dNowInput;
if(this.dMemory!=0)
tf2.setText("M");
}
// key "MC"
if(this.keyAvailable && e.getActionCommand()=="MC")
{
this.dMemory=0;
tf2.setText("");
}
// key "MR"
if(this.keyAvailable && e.getActionCommand()=="MR")
{
this.dNowInput=this.dMemory;
tf1.setText(Double.toString(this.dNowInput));
}
// key "M+"
if(this.keyAvailable && e.getActionCommand()=="M+")
{
this.dMemory+=this.dNowInput;
if(this.dMemory!=0)
tf2.setText("M");
else tf2.setText("");
}
// key "%"
if(this.keyAvailable && e.getActionCommand()=="%")
{
this.dNowInput=(this.dResult*this.dNowInput)/100;
tf1.setText(Double.toString(this.dNowInput));
}
// key "Backspace"
if(this.keyAvailable && e.getActionCommand()=="Backspace")
{
if(!this.alreadyClickedEqueal){
if(this.dNowInput!=0)
{
if(this.alreadyHaveDot)
{
if(this.n==-1)
{
this.alreadyHaveDot=false;
this.n=0;
}
else
{
String str,str1;
str=tf1.getText();
str1=str.substring(0,this.nBitsNum-1);
this.nBitsNum--;
this.n++;
this.dNowInput=Double.parseDouble(str1);
tf1.setText(Double.toString(this.dNowInput));
}
}
else
{
int temp;
temp=(int)(this.dNowInput/10);
this.dNowInput=(double)temp;
tf1.setText(Double.toString(this.dNowInput));
}
}
}
}
}
public static void main(String args[])
{
Calculation cal=new Calculation();
cal.display();
}
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
}2008-01-04