java简单计算器代码，用java实现简单计算器
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JAVA简单咋做,计算器代码
简单写了下，代码如下请参照：
/**
*计算器类
*
*@authorAdministrator
*
*/
publicclassCalculatorextendsJFrameimplementsActionListener{
privatestaticfinallongserialVersionUID=3868243398506940702L;
//文本框
privateJTextFieldresult;
//按钮数组
privateJButton[]buttons;
//按钮文本
privatefinalString[]characters={"7","8","9","/","4","5","6",
"*","1","2","3","-","0",".","=","+"};
//是否为第一个输入的数字
privatebooleanisFirstDigit=true;
//运算结果
privatedoubleresultNum=0.0;
//运算符
privateStringoperator="=";
publicCalculator(Stringtitle){
//设置标题栏
super(title);
//初始化各组件
init();
//注册各组件监听器
registerListener();
//显示窗体
setVisible(true);
}
/**
*初始化各组件
*/
privatevoidinit(){
//常用属性初始化
setSize(220,200);
setResizable(false);
setLocationRelativeTo(null);
setDefaultCloseOperation(EXIT_ON_CLOSE);
/*文本框对象初始化*/
result=newJTextField("0");
//文本右对齐
result.setHorizontalAlignment(JTextField.RIGHT);
//设置是否可编辑
result.setEditable(false);
/*按钮初始化*/
buttons=newJButton[characters.length];
for(inti=0;i<buttons.length;i++){
buttons[i]=newJButton(characters[i]);
buttons[i].setFocusable(false);//不允许按钮定位焦点
}
/*将文本框与按钮添加到窗体中*/
add(result,BorderLayout.NORTH);
JPanelpnl=newJPanel(newGridLayout(4,4,5,5));
for(JButtonjButton:buttons){
pnl.add(jButton);
}
add(pnl);
this.getContentPane().setFocusable(true);
}
/**
*注册监听器
*/
privatevoidregisterListener(){
for(JButtonjButton:buttons){
jButton.addActionListener(this);
}
//注册键盘事件
this.getContentPane().addKeyListener(newKeyAdapter(){
@Override
publicvoidkeyPressed(KeyEvente){
Stringtext=String.valueOf(e.getKeyChar());
if(Character.isDigit(text.charAt(0))||".".equals(text)){//数字或小数点
handleNumber(text);
}elseif("+-*/=".indexOf(text)!=-1){//运算符
handleOperator(text);
}elseif(e.getKeyCode()==8){//退格键
Stringtmp=result.getText().trim();
if(tmp.length()==1){
result.setText("0");
isFirstDigit=true;
}else{
result.setText(tmp.substring(0,tmp.length()-1));
}
}
}
});
}
@Override
publicvoidactionPerformed(ActionEvente){
JButtonbtn=(JButton)e.getSource();
Stringtext=btn.getText().trim();
if(Character.isDigit(text.charAt(0))||".".equals(text)){//处理数字和小数点
handleNumber(text);
}else{//处理运算符
handleOperator(text);
}
}
/**
*处理数字和小数点
*
*@paramtext
*/
privatevoidhandleNumber(Stringtext){
if(isFirstDigit){//第一次输入
if(".".equals(text)){
this.result.setText("0.");
}else{
this.result.setText(text);
}
}elseif("0".equals(text)&&"0".equals(this.result.getText())){
isFirstDigit=true;
return;
}elseif(".".equals(text)&&this.result.getText().indexOf(".")==-1){
this.result.setText(this.result.getText()+".");
}elseif(!".".equals(text)){
this.result.setText(this.result.getText()+text);
}
isFirstDigit=false;
}
/**
*处理运算符
*
*@paramtext
*/
privatevoidhandleOperator(Stringtext){
switch(operator){//处理各项运算适用于JDK1.7版本的
case"+":
resultNum+=Double.parseDouble(this.result.getText());
break;
case"-":
resultNum-=Double.parseDouble(this.result.getText());
break;
case"*":
resultNum*=Double.parseDouble(this.result.getText());
break;
case"/":
resultNum/=Double.parseDouble(this.result.getText());
break;
case"=":
resultNum=Double.parseDouble(this.result.getText());
break;
}
//将文本框的值修改为运算结果
this.result.setText(String.valueOf(resultNum));
//将点击的运算符放入operator保存
operator=text;
//下一个数字第一次点击
isFirstDigit=true;
}
publicstaticvoidmain(String[]args){
newCalculator("MyCalculator");
}
}运行结果如下：
求一简单Java计算器应用程序代码,
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Calculator extends JFrame implements ActionListener
{
private boolean dotExist, operated, equaled;//帮助运算的布尔变量
private double storedNumber;//目前的结果
private char lastOperator;//表示上一运算符
private JTextField operation;//结果栏
private JButton dot, plus, minus, multi, div, sqrt, equal, changePN, clear;//运算符
private JButton[] numbers;//数字
//构造者
public Calculator()
{
setTitle("Calculator");
//初始化变量
dotExist= false;//表示当前的数是否有小数点
operated= false;//表示任意运算符是否被按下
equaled= false;//表示等号是否被按下
storedNumber= 0;
lastOperator='?';
//初始化窗口变量
operation= new JTextField("0");
operation.setEditable(false);
numbers= new JButton[10];
for(int i= 0; i< 10; i++)
numbers[i]= new JButton(""+ i);
dot= new JButton(".");
plus= new JButton("+");
minus= new JButton("-");
multi= new JButton("*");
div= new JButton("/");
sqrt= new JButton("√");
equal= new JButton("=");
changePN= new JButton("±");
clear= new JButton("AC");
//将窗口物体放入窗口
GridBagLayout layout= new GridBagLayout();
getContentPane().setLayout(layout);
addComponent(layout, operation, 0, 0, 4, 1);
addComponent(layout, numbers[1], 1, 0, 1, 1);
addComponent(layout, numbers[2], 1, 1, 1, 1);
addComponent(layout, numbers[3], 1, 2, 1, 1);
addComponent(layout, numbers[4], 2, 0, 1, 1);
addComponent(layout, numbers[5], 2, 1, 1, 1);
addComponent(layout, numbers[6], 2, 2, 1, 1);
addComponent(layout, numbers[7], 3, 0, 1, 1);
addComponent(layout, numbers[8], 3, 1, 1, 1);
addComponent(layout, numbers[9], 3, 2, 1, 1);
addComponent(layout, dot, 4, 0, 1, 1);
addComponent(layout, numbers[0], 4, 1, 1, 1);
addComponent(layout, sqrt, 4, 2, 1, 1);
addComponent(layout, plus, 1, 3, 1, 1);
addComponent(layout, minus, 2, 3, 1, 1);
addComponent(layout, multi, 3, 3, 1, 1);
addComponent(layout, div, 4, 3, 1, 1);
addComponent(layout, equal, 5, 0, 2, 1);
addComponent(layout, changePN, 5, 2, 1, 1);
addComponent(layout, clear, 5, 3, 1, 1);
}
//对按钮进行反应的方法
public void actionPerformed(ActionEvent e)
{
JButton btn=(JButton)e.getSource();
if(btn== clear)
{
operation.setText("0");
dotExist= false;
storedNumber= 0;
lastOperator='?';
}
else if(btn== equal)
{
operate('=');
equaled= true;
}
else if(btn== plus)
{
operate('+');
equaled= false;
}
else if(btn== minus)
{
operate('-');
equaled= false;
}
else if(btn== multi)
{
operate('*');
equaled= false;
}
else if(btn== div)
{
operate('/');
equaled= false;
}
else if(btn== changePN)
{
operate('p');
operate('=');
equaled= true;
}
else if(btn== sqrt)
{
operate('s');
operate('=');
equaled= true;
}
else
{
if(equaled)
storedNumber= 0;
for(int i= 0; i< 10; i++)
if(btn== numbers[i])
{
if(operation.getText().equals("0"))
operation.setText(""+ i);
else if(! operated)
operation.setText(operation.getText()+ i);
else
{
operation.setText(""+ i);
operated= false;
}
}
if(btn== dot&&! dotExist)
{
operation.setText(operation.getText()+".");
dotExist= true;
}
}
}
//进行运算的方法
private void operate(char operator)
{
double currentNumber= Double.valueOf(operation.getText()).doubleValue();
if(lastOperator=='?')
storedNumber= currentNumber;
else if(lastOperator=='+')
storedNumber+= currentNumber;
else if(lastOperator=='-')
storedNumber-= currentNumber;
else if(lastOperator=='*')
storedNumber*= currentNumber;
else if(lastOperator=='/')
storedNumber/= currentNumber;
else if(lastOperator=='p')
storedNumber*=-1;
else if(lastOperator=='s')
storedNumber= Math.sqrt(currentNumber);
else if(lastOperator=='='&& equaled)
storedNumber= currentNumber;
operation.setText(""+ storedNumber);
operated= true;
lastOperator= operator;
}
//快捷使用GridBagLayout的方法
private void addComponent(GridBagLayout layout, Component component, int row, int col, int width, int height)
{
GridBagConstraints constraints= new GridBagConstraints();
constraints.fill= GridBagConstraints.BOTH;
constraints.insets= new Insets(10, 2, 10, 2);
constraints.weightx= 100;
constraints.weighty= 100;
constraints.gridx= col;
constraints.gridy= row;
constraints.gridwidth= width;
constraints.gridheight= height;
layout.setConstraints(component, constraints);
if(component instanceof JButton)
((JButton)component).addActionListener(this);
getContentPane().add(component);
}
//主方法初始化并显示窗口
public static void main(String[] args)
{
Calculator calc= new Calculator();
calc.setSize(290, 400);
calc.setVisible(true);
}
}
如果你想加sin cos tan的话就建它们的按钮在actionPerformed方法中的if-else语句中加else if(btn== sin){operate('S');operate('=');equaled= true;}然后在operate方法加对应的语句就行了.记忆M+, M-没时间搞这个应该比较简单容易明白吧.
跪求简单计算器的java代码,要入门级的编程~~
//////////////////////////这个很简单,方法也差不多////////////////////
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
public class Calculator extends JFrame implements ActionListener
{
///////////////菜单
JMenuBar mb;
JMenu mEdit,mFind,mHelp;
JMenuItem mEditCopy,mEditPaste;
JMenuItem mFindStandarded,mFindScience,mFindGroup;
JMenuItem mHelpTopic,mHelpAbout;
JPanel pan;
/////////////按钮
JTextField tf;
JButton butnull;
JButton butBackspace,butCE,butC;
JButton butMC,butMR,butMS,butM;
JButton but1,but2,but3,but4,but5,but6,but7,but8,but9,but0;
JButton butChu,butSqrt,butCheng,butYu,butJian,but1x,butDot,butJia,butEqual,butJJ;
Calculator()
{
mb=new JMenuBar();
mEdit=new JMenu("编辑(E)");
mEdit.setMnemonic('E');
mFind=new JMenu("查看(F)");
mFind.setMnemonic('F');
mHelp=new JMenu("帮助(H)");
mFind.setMnemonic('H');
mEditCopy=new JMenuItem("复制(C)");
mEditCopy.setMnemonic('C');
mEditPaste=new JMenuItem("粘贴(P)");
mEditCopy.setMnemonic('P');
mFindStandarded=new JMenuItem("标准型(T)");
mFindStandarded.setMnemonic('T');
mFindScience=new JMenuItem("科学型(S)");
mFindScience.setMnemonic('S');
mFindGroup=new JMenuItem("数字分组(I)");
mFindGroup.setMnemonic('I');
mHelpTopic=new JMenuItem("帮助主题(H)");
mHelpTopic.setMnemonic('H');
mHelpAbout=new JMenuItem("关于我们(A)");
mHelpAbout.setMnemonic('A');
////////////////////////////添加mb组件beginning
mb.add(mEdit);
mb.add(mFind);
mb.add(mHelp);
mEdit.add(mEditCopy);
mEdit.add(mEditPaste);
mFind.add(mFindStandarded);
mFind.add(mFindScience);
mFind.add(mFindGroup);
mHelp.add(mHelpTopic);
mHelp.add(mHelpAbout);//////////////ending
////////////////////////***创建计算机按钮***////////////////////
Color red=new Color(250,0,0);
Color green=new Color(0,127,0);
butnull=new JButton("?");
butnull.setForeground(red);
butnull.addActionListener(this);
butBackspace=new JButton("Backspace");
butBackspace.setForeground(green);
butCE=new JButton("CE");
butCE.setForeground(green);
butC=new JButton("C");
butC.addActionListener(this);
butC.setForeground(red);
butMC=new JButton("MC");
butMC.setForeground(green);
butMR=new JButton("MR");
butMR.setForeground(green);
butMS=new JButton("MS");
butMS.setForeground(green);
butM=new JButton("M+");
butM.setForeground(green);
butChu=new JButton("/");
butChu.addActionListener(this);
butChu.setForeground(red);
butCheng=new JButton("*");
butCheng.addActionListener(this);
butCheng.setForeground(red);
butJian=new JButton("-");
butJian.addActionListener(this);
butJian.setForeground(red);
butJia=new JButton("+");
butJia.addActionListener(this);
butJia.setForeground(red);
butEqual=new JButton("=");
butEqual.addActionListener(this);
butEqual.setForeground(red);
Color blue=new Color(0,0,250);
butSqrt=new JButton("sqrt");
butSqrt.setForeground(green);
butYu=new JButton("%");
butYu.setForeground(green);
but1x=new JButton("1/x");
but1x.setForeground(green);
butDot=new JButton(".");
butDot.setForeground(blue);
butDot.addActionListener(this);
butJJ=new JButton("+/-");
butJJ.setForeground(blue);
butJJ.addActionListener(this);
but1=new JButton("1");
but1.addActionListener(this);
but1.setForeground(blue);
but2=new JButton("2");
but2.addActionListener(this);
but2.setForeground(blue);
but3=new JButton("3");
but3.addActionListener(this);
but3.setForeground(blue);
but4=new JButton("4");
but4.addActionListener(this);
but4.setForeground(blue);
but5=new JButton("5");
but5.addActionListener(this);
but5.setForeground(blue);
but6=new JButton("6");
but6.addActionListener(this);
but6.setForeground(blue);
but7=new JButton("7");
but7.addActionListener(this);
but7.setForeground(blue);
but8=new JButton("8");
but8.addActionListener(this);
but8.setForeground(blue);
but9=new JButton("9");
but9.addActionListener(this);
but9.setForeground(blue);
but0=new JButton("0");
but0.addActionListener(this);
but0.setForeground(blue);///////////////////////////////ending
pan=new JPanel(null);//创建最大的panel
tf=new JTextField("0");//输入显示框
tf.setBounds(5,0,337,25);//显示框设置大小位置
tf.setBackground(Color.white);
tf.setHorizontalAlignment(JTextField.RIGHT);//输入框设置位子居右显示
tf.setEditable(false);
JPanel pa=new JPanel(new BorderLayout());//所有按钮的panel
pa.setBounds(5,35,340,240);
JPanel pp=new JPanel(new BorderLayout());//null,MC,MR,MS,M+的panel;pa的西
JPanel aa=new JPanel(new BorderLayout());//其余所有Button的panel;pa的中
JPanel p=new JPanel(new GridLayout(4,1));//MC,MR,MS,M+的Panel，pp的中北是一个butnull
JPanel a=new JPanel(new GridLayout(1,3));//backspace,ce,c的panel，aa的北
JPanel a2=new JPanel(new GridLayout(4,5));//其余的button的panel，aa的中
pa.add(pp,BorderLayout.WEST);
pa.add(aa,BorderLayout.CENTER);
pp.add(butnull,BorderLayout.NORTH);
pp.add(p,BorderLayout.CENTER);
p.add(butMC);
p.add(butMR);
p.add(butMS);
p.add(butM);
aa.add(a,BorderLayout.NORTH);
aa.add(a2,BorderLayout.CENTER);
a.add(butBackspace);
a.add(butCE);
a.add(butC);
a2.add(but7);
a2.add(but8);
a2.add(but9);
a2.add(butChu);
a2.add(butSqrt);
a2.add(but4);
a2.add(but5);
a2.add(but6);
a2.add(butCheng);
a2.add(butYu);
a2.add(but1);
a2.add(but2);
a2.add(but3);
a2.add(butJian);
a2.add(but1x);
a2.add(but0);
a2.add(butJJ);
a2.add(butDot);
a2.add(butJia);
a2.add(butEqual);
this.add(pan);
pan.add(tf);
pan.add(pa);
this.setTitle("我的计算器");
this.setJMenuBar(mb);
this.setBounds(200,300,353,330);//设置窗口大小
this.setResizable(false);
this.setVisible(true);
}
public static void main(String args[])
{
try
{
UIManager.setLookAndFeel(
UIManager.getSystemLookAndFeelClassName());
}
catch(Exception ex)
{
ex.printStackTrace();
}
new Calculator();
}
////////////////////********以下是监听设置和运算*******///////////////////
boolean b=true;//初始值设置为真未点运算符号
String fuhao="";//保存最后一次运算符号，用于进行上次结果的运算
String lastCommand="";//保存按等号前的最后的运算符号
double lastValue=0.0;//保存按等号钱的最后的输入框里的值
double value=0.0;//原值，当你点完运算符的时候计算之前的值
double fuzhi=0.0;
public void actionPerformed(ActionEvent click)/////////////////////行为监听设置
{
if(click.getSource()==butJJ)
{
fuzhi=Double.parseDouble(tf.getText());
if(tf.getText().equals("0")||tf.getText().equals("0."))
{
boolean b=true;
String fuhao="";
double value=0.0;
tf.setText("0");
}
else if(fuzhi<0)
{
tf.setText((-fuzhi)+"");
}
else
{
tf.setText("-"+tf.getText());
}
}
if(click.getSource()==butnull)
{
tf.setText("本计算器版权所有归青软培训--胡迅--2008年10月18日著");
}
if(click.getSource()==butC)
{
tf.setText("0");
lastCommand="";
lastValue=0.0;
b=true;
fuhao="";
value=0.0;
}
if(click.getSource()==but1)
{
if(b==false)
{
tf.setText("1");
b=true;
}
else if(tf.getText().equals("0"))
{
tf.setText("1");
}
else
{
tf.setText(tf.getText()+1);
}
}
if(click.getSource()==but2)
{
if(b==false)
{
tf.setText("2");
b=true;
}
else if(tf.getText().equals("0"))
{
tf.setText("2");
}
else
{
tf.setText(tf.getText()+2);
}
}
if(click.getSource()==but3)
{
if(b==false)
{
tf.setText("3");
b=true;
}
else if(tf.getText().equals("0"))
{
tf.setText("3");
}
else
{
tf.setText(tf.getText()+3);
}
}
if(click.getSource()==but4)
{
if(b==false)
{
tf.setText("4");
b=true;
}
else if(tf.getText().equals("0"))
{
tf.setText("4");
}
else
{
tf.setText(tf.getText()+4);
}
}
if(click.getSource()==but5)
{
if(b==false)
{
tf.setText("5");
b=true;
}
else if(tf.getText().equals("0"))
{
tf.setText("5");
}
else
{
tf.setText(tf.getText()+5);
}
}
if(click.getSource()==but6)
{
if(b==false)
{
tf.setText("6");
b=true;
}
else if(tf.getText().equals("0"))
{
tf.setText("6");
}
else
{
tf.setText(tf.getText()+6);
}
}
if(click.getSource()==but7)
{
if(b==false)
{
tf.setText("7");
b=true;
}
else if(tf.getText().equals("0"))
{
tf.setText("7");
}
else
{
tf.setText(tf.getText()+7);
}
}
if(click.getSource()==but8)
{
if(b==false)
{
tf.setText("8");
b=true;
}
else if(tf.getText().equals("0"))
{
tf.setText("8");
}
else
{
tf.setText(tf.getText()+8);
}
}
if(click.getSource()==but9)
{
if(b==false)
{
tf.setText("9");
b=true;
}
else if(tf.getText().equals("0"))
{
tf.setText("9");
}
else
{
tf.setText(tf.getText()+9);
}
}
if(click.getSource()==but0)
{
if(b==false)
{
tf.setText("0");
b=true;
}
else if(tf.getText().equals("0"))
{
tf.setText("0");
}
else
{
tf.setText(tf.getText()+0);
}
}
if(click.getSource()==butDot)
{
/////////code/////////////////////////////////////////////////////////////////////////////////////////////////////////???
int izhi=Integer.parseInt(tf.getText());
double dzhi=Double.parseDouble(tf.getText());
if(tf.getText().equals("0"))
{
tf.setText("0.");
}
else
{
if(tf.getText().equals("0."))
{
tf.setText("0.");
}
else
{
if(dzhi>0)
{
izhi=izhi;
dzhi=dzhi;
if(dzhi==izhi)
{
tf.setText(tf.getText()+".");
}
}
else
{
izhi=-izhi;
dzhi=-dzhi;
if(dzhi==izhi)
{
tf.setText(tf.getText()+".");
}
}
}
}
}
if(click.getSource()==butJia)///////////////////////////////////////////////"+"
{
if(tf.getText().equals("0"))
{
}
else if(fuhao=="")
{
double tfvaluejia;
tfvaluejia=Double.parseDouble(tf.getText());
value=tfvaluejia;
tf.setText(""+value);
b=false;
fuhao="+";
}
else if(fuhao=="*")
{
double tfvalueCheng;
tfvalueCheng=Double.parseDouble(tf.getText());
value=value*tfvalueCheng;
tf.setText(""+value);
b=false;
}
else if(fuhao=="/")
{
double tfvalueChu;
tfvalueChu=Double.parseDouble(tf.getText());
value=value/tfvalueChu;
tf.setText(""+value);
b=false;
}
else if(fuhao=="-")
{
double tfvaluejian;
tfvaluejian=Double.parseDouble(tf.getText());
value=value-tfvaluejian;
tf.setText(""+value);
b=false;
}
else if(fuhao=="=")
{
double tfvaluejia;
tfvaluejia=Double.parseDouble(tf.getText());
value=tfvaluejia;
b=false;
}
else
{
double tfvaluejia;
tfvaluejia=Double.parseDouble(tf.getText());//2
value=value+tfvaluejia;
tf.setText(""+value);
b=false;
}
lastValue=Double.parseDouble(tf.getText());
fuhao="+";
lastCommand="+";
}
if(click.getSource()==butCheng)////////////////////////////////////////////////////////////"*"
{
if(tf.getText().equals("0"))
{
}
else if(fuhao=="")
{
double tfvalueCheng;
tfvalueCheng=Double.parseDouble(tf.getText());
value=tfvalueCheng;
tf.setText(""+value);
b=false;
fuhao="*";
}
else if(fuhao=="+")
{
double tfvaluejia;
tfvaluejia=Double.parseDouble(tf.getText());
value=value+tfvaluejia;
tf.setText(""+value);
b=false;
}
else if(fuhao=="/")
{
double tfvalueChu;
tfvalueChu=Double.parseDouble(tf.getText());
value=value/tfvalueChu;
tf.setText(""+value);
b=false;
}
else if(fuhao=="-")
{
double tfvaluejian;
tfvaluejian=Double.parseDouble(tf.getText());
value=value-tfvaluejian;
tf.setText(""+value);
b=false;
}
else if(fuhao=="=")
{
double tfvalueCheng;
tfvalueCheng=Double.parseDouble(tf.getText());
value=tfvalueCheng;
b=false;
}
else
{
double tfvalueCheng;
tfvalueCheng=Double.parseDouble(tf.getText());
value=value*tfvalueCheng;
tf.setText(""+value);
b=false;
}
lastValue=Double.parseDouble(tf.getText());
fuhao="*";
lastCommand="*";
}
if(click.getSource()==butChu)//////////////////////////////////////////////"/"
{
if(tf.getText().equals("0"))
{
}
else if(fuhao=="")
{
double tfvalueChu;
tfvalueChu=Double.parseDouble(tf.getText());
value=tfvalueChu;
tf.setText(""+value);
b=false;
fuhao="/";
}
else if(fuhao=="+")
{
double tfvaluejia;
tfvaluejia=Double.parseDouble(tf.getText());
value=value+tfvaluejia;
tf.setText(""+value);
b=false;
}
else if(fuhao=="*")
{
double tfvalueCheng;
tfvalueCheng=Double.parseDouble(tf.getText());
value=value*tfvalueCheng;
tf.setText(""+value);
b=false;
}
else if(fuhao=="-")
{
double tfvaluejian;
tfvaluejian=Double.parseDouble(tf.getText());
value=value-tfvaluejian;
tf.setText(""+value);
b=false;
}
else if(fuhao=="=")
{
double tfvalueCheng;
tfvalueCheng=Double.parseDouble(tf.getText());
value=tfvalueCheng;
b=false;
}
else
{
double tfvalueChu;
tfvalueChu=Double.parseDouble(tf.getText());
value=value/tfvalueChu;
tf.setText(""+value);
b=false;
}
lastValue=Double.parseDouble(tf.getText());
fuhao="/";
lastCommand="/";
}
if(click.getSource()==butJian)////////////////////////////////////////////////////////////////////////"-"
{
if(tf.getText().equals("0"))
{
}
else if(fuhao=="")
{
double tfvaluejian;
tfvaluejian=Double.parseDouble(tf.getText());
value=tfvaluejian;
tf.setText(""+value);
b=false;
fuhao="/";
}
else if(fuhao=="+")
{
double tfvaluejia;
tfvaluejia=Double.parseDouble(tf.getText());
value=value+tfvaluejia;
tf.setText(""+value);
b=false;
}
else if(fuhao=="*")
{
double tfvalueCheng;
tfvalueCheng=Double.parseDouble(tf.getText());
value=value*tfvalueCheng;
tf.setText(""+value);
b=false;
}
else if(fuhao=="/")
{
double tfvalueChu;
tfvalueChu=Double.parseDouble(tf.getText());
value=value/tfvalueChu;
tf.setText(""+value);
b=false;
}
else if(fuhao=="=")
{
double tfvalueCheng;
tfvalueCheng=Double.parseDouble(tf.getText());
value=tfvalueCheng;
b=false;
}
else
{
double tfvaluejian;
tfvaluejian=Double.parseDouble(tf.getText());
value=value-tfvaluejian;
tf.setText(""+value);
b=false;
}
lastValue=Double.parseDouble(tf.getText());
fuhao="-";
lastCommand="-";
}
if(click.getSource()==butEqual)//////////////////////////////////////////"="
{
if(tf.getText().equals("0"))
{
}
if(fuhao=="+")
{
double tfvaluejia;
tfvaluejia=Double.parseDouble(tf.getText());
value=value+tfvaluejia;
tf.setText(""+value);
b=false;
}
else if(fuhao=="*")
{
double tfvalueCheng;
tfvalueCheng=Double.parseDouble(tf.getText());
value=value*tfvalueCheng;
tf.setText(""+value);
b=false;
}
else if(fuhao=="/")
{
double tfvalueChu;
tfvalueChu=Double.parseDouble(tf.getText());
value=value/tfvalueChu;
tf.setText(""+value);
b=false;
}
else if(fuhao=="-")
{
double tfvaluejian;
tfvaluejian=Double.parseDouble(tf.getText());
value=value-tfvaluejian;
tf.setText(""+value);
b=false;
}
else if(fuhao=="=")
{
if(lastCommand=="+")
{
value= value+lastValue;
tf.setText(""+value);
b=false;
}
else if(lastCommand=="-")
{
value= value- lastValue;
tf.setText(""+value);
b=false;
}
if(lastCommand=="*")
{
value= value*lastValue;
tf.setText(""+value);
b=false;
}
if(lastCommand=="/")
{
value= value/lastValue;
tf.setText(""+value);
b=false;
}
}
fuhao="=";
}
}
}
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