JAVA計(jì)算器代碼

import java.awt.*;

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import java.applet.*;

public class CalculatorDemo extends Applet

{

TextField answerText;

Button pointButton,equalButton,plusButton;

Button minusButton,clearButton,multiButton,divisionButton;

Button[] b=new Button[10];

String currentOp,preOp;

String foreText,backText;

boolean isFloat=false;

public void init()

{

Panel p1=new Panel();

Panel p2=new Panel();

Panel p3=new Panel();

currentOp=new String("");

preOp=new String("");

foreText=new String("");

backText=new String("");

answerText=new TextField(8);

setBackground(Color.lightGray);

setForeground(Color.blue);

for(int i=9;i=0;i--)

{

b[i]=new Button(Integer.toString(i));

p2.add(b[i]);

}

pointButton=new Button(".");

equalButton=new Button("=");

equalButton.setForeground(Color.red);

clearButton=new Button("清除");

clearButton.setForeground(Color.red);

divisionButton=new Button("/");

divisionButton.setForeground(Color.red);

multiButton=new Button("*");

multiButton.setForeground(Color.red);

minusButton=new Button("-");

minusButton.setForeground(Color.red);

plusButton=new Button("+");

plusButton.setForeground(Color.red);

setLayout(new FlowLayout());

p1.setLayout(new FlowLayout());

p2.setLayout(new GridLayout(4,3));

p3.setLayout(new GridLayout(4,1));

p1.add(answerText);

p1.add(clearButton);

p2.add(pointButton);

p2.add(equalButton);

p3.add(plusButton);

p3.add(minusButton);

p3.add(multiButton);

p3.add(divisionButton);

add(p1);

add(p2);

add(p3);

}

public boolean action(Event e,Object o)

{

String s=new String("");

for(int i=0;i10;i++)

{

if(e.target==b[i]||e.target==pointButton)

{

if(e.target !=pointButton)

{

s=(String)o;

doForeText(s);

}

if((e.target==pointButton)(!isFloat))

{

isFloat=true;

s=(String)o;

if(foreText.equals(""))

{

foreText +="0.";

}

else

{

doForeText(s);

}

}

}

}

if(e.target==clearButton)

{

doClear();

}

if((e.target==clearButton)||(e.target==divisionButton)

||(e.target==plusButton)||(e.target==minusButton))

{

if(foreText !="")

{

currentOp=((String)o);

doOperator();

}

else

{

preOp=((String)o);

}

}

if(e.target==equalButton)

{

doOperator();

}

return true;

}

public void doOperator()

{

double dFore,dBack;

Double d;

if(preOp.equals(""))

{

backText=foreText;

foreText="";

answerText.setText(backText);

}

else

{

dFore=(new Double(foreText)).doubleValue();

dBack=(new Double(backText)).doubleValue();

foreText="";

backText=answerText.getText();

if(preOp.equals("+"))

{

d=new Double((dBack+dFore));

answerText.setText(d.toString());

backText=d.toString();

}

if(preOp.equals("-"))

{

d=new Double((dBack-dFore));

answerText.setText(d.toString());

backText=d.toString();

}

if(preOp.equals("*"))

{

d=new Double((dBack*dFore));

answerText.setText(d.toString());

backText=d.toString();

}

if(preOp.equals("/"))

{

if(dFore==0)

{

answerText.setText("除數(shù)不能為0");

return;

}

d=new Double((dBack/dFore));

answerText.setText(d.toString());

backText=d.toString();

}

}

preOp=currentOp;

}

public void doForeText(String s)

{

foreText +=s;

answerText.setText(foreText);

}

public void doBackText(String s)

{

backText=foreText;

foreText="";

answerText.setText(foreText);

}

public void doClear()

{

currentOp="";

preOp="";

foreText="";

backText="";

isFloat=false;

answerText.setText("");

}

}

急求！！！如何用java程序代碼實(shí)現(xiàn)計(jì)算器界面

package?jisuanqi_new;

import?java.awt.*;

import?java.awt.event.*;

public?class?JiSuanQi_new?implements?ActionListener

{

Panel?p1;//聲明面板p1

TextField?t1;//聲明文本行t1

String[]?label?=?{"7","8","9","/","4","5","6","*","1","2","3","-","0",".","=","+"};//聲明標(biāo)簽數(shù)組label1存放按鈕上的標(biāo)簽

Button[]?b;//聲明按鈕數(shù)組存放16個(gè)按鈕

private?int?i;//聲明i以備后用

private?String?op1?=?"0";//運(yùn)算數(shù)備用

private?String?operator?=?"+";//運(yùn)算符備用

private?boolean?append?=?false;//備用

public?JiSuanQi_new()//構(gòu)造方法

{

t1=new?TextField();//初始化文本行t1

b?=?new?Button[label.length];//初始化按鈕數(shù)組b

p1=new?Panel();//初始化面板p1

p1.setLayout(new?GridLayout(4,4,4,4));//使面板選擇網(wǎng)格布局管理器以備儲(chǔ)存16個(gè)按鈕（4行4列）

for(int?i=0;ib.length;i++)//利用for循環(huán)把標(biāo)簽放在按鈕上，使每個(gè)按鈕添加事件監(jiān)聽器，在面板p1上添加上16個(gè)按鈕

{

b[i]?=?new?Button(label[i]);//把標(biāo)簽依次放在16個(gè)按鈕上

b[i].addActionListener(this);//使每個(gè)按鈕添加動(dòng)作事件監(jiān)聽器

p1.add(b[i]);?//分別將按鈕添加到面板p1上

}

Frame?f=new?Frame("計(jì)算器1.0");//初始化窗口f,起名字計(jì)算器1.0

f.setLayout(new?BorderLayout());//為窗口選擇邊界布局管理器

f.add(BorderLayout.NORTH,t1);//把文本行他添加到窗口的北部

f.add(BorderLayout.CENTER,p1);//把面吧p1添加到窗口的中間

f.addWindowListener(new?WindowAdapter(){//給窗口f添加窗口事件監(jiān)聽器

public?void?windowClosing(WindowEvent?eve){//運(yùn)行窗口關(guān)閉方法

System.exit(0);//退出程序

}

});

f.setSize(250,?250);//設(shè)置窗口大小

f.setLocation(200,200);

f.setVisible(true);//顯示窗口

}

public?static?void?main(String?args[])

{

new?JiSuanQi_new();?//調(diào)用構(gòu)造方法

}

public?void?actionPerformed(ActionEvent?ae)

{//按鈕被操作發(fā)生

String?comm?=?ae.getActionCommand();//返回與此動(dòng)作相關(guān)的命令字符串，即：使用者第一次點(diǎn)擊的按鈕是什么。

if("0123456789".indexOf(comm)!=-1)//如果相關(guān)命令字符串為0~9之間的數(shù)字則執(zhí)行

{

if(append){

String?temp?=?t1.getText();//新數(shù)字

t1.setText(temp+comm);

}else{?????????????????????????//因?yàn)榇藭r(shí)append為false執(zhí)行這個(gè)

t1.setText(comm);?//將文本行t1設(shè)置為相關(guān)命令字符串（你按中的按鈕代碼）

append?=??true;//此時(shí)append=true若繼續(xù)按按鈕若繼續(xù)按數(shù)字的話1.第一次的按話不會(huì)改變2.非第一次按得話會(huì)覆蓋之前按得數(shù)字（即缺點(diǎn)：只能進(jìn)行單個(gè)數(shù)字的計(jì)算）

}

}

else?if(("+-*/".indexOf(comm)!=-1))//如果相關(guān)命令字符串為+-*/之間的數(shù)字則執(zhí)行

{

//保存

//t1.setText(comm);

op1?=?t1.getText();//把第一個(gè)數(shù)賦值給op1

operator?=?comm;//把命令字符串賦值給operator

append?=?false;//此時(shí)append為false即若繼續(xù)按按鈕若按數(shù)字的話將重復(fù)上面的動(dòng)作，按符號(hào)的話將覆蓋之前的符號(hào)

}

else?if("=".equals(comm))//如果按的是=號(hào)，則按條件進(jìn)行下面的運(yùn)算

{

String?op2?=?t1.getText();//op2第二個(gè)數(shù)

double?d1?=?Double.parseDouble(op1);

double?d2?=?Double.parseDouble(op2);

if(operator.equals("+")){

d1?=?d1?+?d2?;

}else?if(operator.equals("-")){

d1?=?d1?-?d2;

}else?if(operator.equals("*")){

d1?=?d1?*?d2;

}else?{

d1?=?d1?/?d2;

}

t1.setText(d1+"");//顯示計(jì)算結(jié)果

append?=?false;

}

else?if(".".equals(comm))//若是.號(hào)繼續(xù)按

{

String?temp?=?t1.getText();

if(temp.indexOf(".")==-1){

t1.setText(temp+".");

append?=?true;

}

}

}

}

如何用JAVA實(shí)現(xiàn)計(jì)算器界面

一個(gè)簡(jiǎn)單的計(jì)算器功能, 代碼不是我寫的，其實(shí)網(wǎng)上有很多這種例子，我只是整理了一下

package?com.zhidao20161213;

import?java.awt.BorderLayout;

import?java.awt.GridLayout;

import?java.awt.event.ActionEvent;

import?java.awt.event.ActionListener;

import?java.awt.event.WindowAdapter;

import?java.awt.event.WindowEvent;

import?javax.swing.JButton;

import?javax.swing.JFrame;

import?javax.swing.JPanel;

import?javax.swing.JTextField;

public?class?JCalculator?extends?JFrame?implements?ActionListener?{

/**

*?

*?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("計(jì)算器");

//?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();

}

}

高分求 用JAVA編寫計(jì)算器界面(只要界面)代碼!

package importantpg;

import java.awt.*;

import java.awt.event.*;

public class jisuanqi

{

TextArea tf=new TextArea(3,50 );

Button lb=new Button("clear");

Panel p1=new Panel();

Panel p2=new Panel();

public jisuanqi()

{ Frame f=new Frame("計(jì)算器");

Panel p=new Panel();

f.setBackground(Color.white);

f.setSize(500, 1500);

f.setVisible(true);

f.addWindowListener(new WindowAdapter()

{

public void windowClosing(WindowEvent e) {System.exit(1);}

});

Button[] b=new Button[18]; b[10]=new Button("-"); b[15]=new Button("(");

b[11]=new Button("+"); b[12]=new Button("*"); b[16]=new Button(")");

b[13]=new Button("/"); b[14]=new Button("="); b[17]=new Button("退格");

for(int i=0;i=9;++i)

{

b[i]=new Button(""+i);

}

p.setLayout(new GridLayout(6,3));

avent aa=new avent();

lb.addActionListener(aa);

for(int i=0;i18;++i)

{

p.add(b[i]);b[i].addActionListener(aa);

}

p1.setLayout(new BorderLayout());

p1.add(lb,"North");p1.add(tf,"South");f.add(p1, "South");

f.add(p,"Center"); f.pack();

} //構(gòu)造方法

public static void main(String args[])

{

new jisuanqi();

}

class avent implements ActionListener //事件體

{

public void actionPerformed(ActionEvent e)

{

String s=null; String in="";

s=e.getActionCommand();

if (s!="="s!=nulls!="clear"s!="退格")

{

tf.append(s);

in+=s; s=null;

}

else if(s=="clear")

{

tf.replaceRange("",0,1000);

}else if(s=="=")

{

tf.append("="+jisuan(tf.getText()));

}

else if(s=="退格") {}

}///////////////////////////////////////////////事件處理方法

}

///////////////////////////////////////計(jì)算過程//////////////

static String jisuan(String s)

{

String hs= "";

char[] ch = new char[s.length()];

int top = -1;

for (int i = 0; i s.length(); i++)

{

char rsc = s.charAt(i);

switch(rsc)

{

case ' ' : break;

case '+' : //操作符

case '-' :

while (top = 0) //棧不為空時(shí)

{

char pc = ch[top--]; //pop Operator

if (pc == '(')

{

ch[++top] = pc; //push Operator

break;

}

else {hs = hs + pc;}

}

ch[++top] = rsc; //push Operator

hs += " ";break;

case '*' : //操作符

case '/' :

while (top = 0) //棧不為空時(shí)

{

char c = ch[top--]; //pop Operator

if (c == '(')

{

ch[++top] = c; //push Operator

break;

}

else

{

if (c == '+' || c == '-')

{

ch[++top] = c; //push Operator

break;

}

else

{

hs = hs + c;

}

}

}

ch[++top] = rsc; //push Operator

hs += " ";

break;

case '(' : //操作符

ch[++top] = rsc;

hs+= " ";

break;

case ')' : //操作符

while (top = 0) //棧不為空時(shí)

{

char c = ch[top--]; //pop Operator

if (c == '(')

{

break;

}

else

{

hs= hs + c;

}

}

hs += " ";

break;

default : //操作數(shù)

hs= hs + rsc;

break;

}//switch

}/////////////////////////////for

while (top = 0)

{

hs= hs + ch[top--]; //pop Operator

}

//System.out.println("hs="+hs); //后綴

//////////////////////////////////////////////后綴////////////////////////////////////

//后綴表達(dá)式計(jì)算

double[] result = new double[hs.length()];

double x, y;

top = - 1;

String st = "";

for (int i = 0; i hs.length(); i++)

{

char c = hs.charAt(i);

if ((c = '0' c = '9') || c == '.')

{

st += c;

}

if ((c == ' ' st != "") || i == hs.length() - 1)

{

result[++top] = Double.parseDouble(st) ; //push Operands

st = "";

}

if (c == '+' || c == '-' || c == '*' || c == '/')

{

if ((st != ""))

{

result[++top] =Double.parseDouble(st) ; //push Operands

st = "";

}

y = result[top--];

x = result[top--];

switch (c)

{

case '+' :

result[++top] = x+y;break;//push 中間結(jié)果再次入棧

case '-' :

result[++top] = x-y;break;

case '*' :

result[++top] = x*y;break;

case '/' :

result[++top] = x/y;break;

default :break;

}

}////////////////////if

} ///////////////////////for

return String.valueOf(result[top]); //pop 最終結(jié)果

} /////////////////////////jisuan

}

Java圖形界面簡(jiǎn)單計(jì)算器

示例代碼如下，請(qǐng)參考：

package?test.com.test;

import?java.awt.*;

import?java.awt.event.*;

import?javax.swing.*;

public?class?Cal?{

TextField?tf?=?new?TextField(40);???????//顯示文本框

StringBuffer?s1?=?new?StringBuffer();???//記錄運(yùn)算數(shù)字，以及保留結(jié)果

StringBuffer?s2?=?new?StringBuffer();???//記錄運(yùn)算數(shù)字，保留上一個(gè)輸入的數(shù)字或運(yùn)算結(jié)果

static?String?flag?=?new?String();??????//標(biāo)記運(yùn)算符號(hào)：+，-，*，/

boolean?start?=?true;???//標(biāo)記運(yùn)算開始或結(jié)束,保證一次運(yùn)算之后，第二次進(jìn)行運(yùn)算時(shí)能同時(shí)清空顯示界面，即s1為空

public?void?init(){

//主界面

JFrame?f?=?new?JFrame("計(jì)算器");

JPanel?p1?=?new?JPanel();

p1.add(tf);

f.add(p1,BorderLayout.NORTH);

JPanel?p2?=?new?JPanel();

p2.setLayout(new?GridLayout(1,3));

//動(dòng)作監(jiān)聽器

ActionListener?listen?=new?ActionListener()?{

public?void?actionPerformed(ActionEvent?arg0)?{

//輸入數(shù)字0~9

if(arg0.getActionCommand()=="0"){

if(!s1.toString().equals(new?String())){

if(!start){

//s1清零，保證可以重新輸入數(shù)字

s1.delete(0,?s1.length());

}

start?=?true;

tf.setText(s1.append("0").toString());

}???

}

if(arg0.getActionCommand()=="1"){

if(!start){

s1.delete(0,?s1.length());

}

start?=?true;

tf.setText(s1.append("1").toString());

}

if(arg0.getActionCommand()=="2"){

if(!start){

s1.delete(0,?s1.length());

}

start?=?true;

tf.setText(s1.append("2").toString());

}

if(arg0.getActionCommand()=="3"){

if(!start){

s1.delete(0,?s1.length());

}

start?=?true;

tf.setText(s1.append("3").toString());

}

if(arg0.getActionCommand()=="4"){

if(!start){

s1.delete(0,?s1.length());

}

start?=?true;

tf.setText(s1.append("4").toString());

}

if(arg0.getActionCommand()=="5"){

if(!start){

s1.delete(0,?s1.length());

}

start?=?true;

tf.setText(s1.append("5").toString());

}

if(arg0.getActionCommand()=="6"){

if(!start){

s1.delete(0,?s1.length());

}

start?=?true;

tf.setText(s1.append("6").toString());

}

if(arg0.getActionCommand()=="7"){

if(!start){

s1.delete(0,?s1.length());

}

start?=?true;

tf.setText(s1.append("7").toString());

}

if(arg0.getActionCommand()=="8"){

if(!start){

s1.delete(0,?s1.length());

}

start?=?true;

tf.setText(s1.append("8").toString());

}

if(arg0.getActionCommand()=="9"){

if(!start){

s1.delete(0,?s1.length());

}

start?=?true;

tf.setText(s1.append("9").toString());

}

//輸入小數(shù)點(diǎn)

if(arg0.getActionCommand()=="."){

if(!start){

s1.delete(0,?s1.length());

}

start=true;

if(s1.toString().equals(new?String()))

tf.setText(s1.append("0.").toString());

else?if(s1.length()==1s1.charAt(0)=='-')

tf.setText(s1.append("0.").toString());

else

tf.setText(s1.append(".").toString());

}

//輸入負(fù)號(hào)

if(arg0.getActionCommand()=="+/-"){

if(!start){

s1.delete(0,?s1.length());

}

start?=?true;

if(s1.toString().equals(new?String()))

tf.setText(s1.append('-').toString());

}

//退格Backspace

if(arg0.getActionCommand()=="Backspace"){

start?=?true;

if(s1.length()!=0){

//刪除最后輸入的一位

s1.deleteCharAt(s1.length()-1);

tf.setText(s1.toString());

}

}

//歸零CE

if(arg0.getActionCommand()=="CE"){

//清空所有，start標(biāo)記設(shè)為true

start?=?true;

s1.delete(0,?s1.length());

s2.delete(0,?s2.length());

tf.setText(s1.toString());

}

//清除C

if(arg0.getActionCommand()=="C"){

//清空當(dāng)前輸入，即s1清零

start?=?true;

s1.delete(0,?s1.length());

tf.setText(s1.toString());

}

//加號(hào)

if(arg0.getActionCommand()=="+"){

start?=?true;

flag="+";

//s2接收s1的值

s2.append(String.valueOf(s1.toString()));

//s1清零，重新接收下一個(gè)數(shù)據(jù)

s1.delete(0,?s1.length());

tf.setText(s1.toString());

}

//減號(hào)

if(arg0.getActionCommand()=="-"){

start?=?true;

flag="-";

s2.append(String.valueOf(s1.toString()));

s1.delete(0,?s1.length());

tf.setText(s1.toString());

}

//乘號(hào)

if(arg0.getActionCommand()=="*"){

start?=?true;

flag="*";

s2.append(String.valueOf(s1.toString()));

s1.delete(0,?s1.length());

tf.setText(s1.toString());

}

//除號(hào)

if(arg0.getActionCommand()=="/"){

start?=?true;

flag="/";

s2.append(String.valueOf(s1.toString()));

s1.delete(0,?s1.length());

tf.setText(s1.toString());

}

//開根號(hào)

if(arg0.getActionCommand()=="sqrt"){

start?=false;

double?s=Double.parseDouble(s1.toString());

s1.delete(0,?s1.length());

tf.setText(s1.append(String.valueOf(Math.sqrt(s))).toString());

}

//求%

if(arg0.getActionCommand()=="%"){

start?=false;

double?s=Double.parseDouble(s1.toString());

s1.delete(0,?s1.length());

tf.setText(s1.append(String.valueOf(s/100)).toString());

}

//求1/x

if(arg0.getActionCommand()=="1/x"!s1.toString().equals(new?String())Double.parseDouble(s1.toString())!=0){

start?=false;

double?s=Double.parseDouble(s1.toString());

s1.delete(0,?s1.length());

tf.setText(s1.append(String.valueOf(1/s)).toString());

}

//求結(jié)果

if(arg0.getActionCommand()=="="s1.length()!=0s2.length()!=0){

//start標(biāo)記為false

start?=false;

//分別獲取s1和s2的值

double?s4=Double.parseDouble(s1.toString());?

double?s3=Double.parseDouble(s2.toString());

//清空s1和s2，便于開始下一次運(yùn)算

s1.delete(0,?s1.length());

s2.delete(0,?s2.length());

//四則運(yùn)算

if(flag=="+"){

tf.setText(s1.append(String.valueOf(s3+s4)).toString());

}

if(flag=="-"){

tf.setText(s1.append(String.valueOf(s3-s4)).toString());

}

if(flag=="*"){

tf.setText(s1.append(String.valueOf(s3*s4)).toString());

}

if(flag=="/"){

tf.setText(s1.append(String.valueOf(s3/s4)).toString());

}

}???????

}

};

//添加按鈕以及監(jiān)聽器

JButton?bks?=?new?JButton("Backspace");

bks.addActionListener(listen);

JButton?ce?=?new?JButton("CE");

ce.addActionListener(listen);

JButton?c?=?new?JButton("C");

c.addActionListener(listen);

p2.add(bks);

p2.add(ce);

p2.add(c);

f.add(p2);

JPanel?p3?=?new?JPanel();

p3.setLayout(new?GridLayout(4,5));

JButton?b1?=?new?JButton("7");

p3.add(b1);

b1.addActionListener(listen);

JButton?b2?=?new?JButton("8");

p3.add(b2);

b2.addActionListener(listen);

JButton?b3?=?new?JButton("9");

p3.add(b3);

b3.addActionListener(listen);

JButton?b4?=?new?JButton("/");

p3.add(b4);

b4.addActionListener(listen);

JButton?b5?=?new?JButton("sqrt");

p3.add(b5);

b5.addActionListener(listen);

JButton?b6?=?new?JButton("4");

p3.add(b6);

b6.addActionListener(listen);

JButton?b7?=?new?JButton("5");

p3.add(b7);

b7.addActionListener(listen);

JButton?b8?=?new?JButton("6");

p3.add(b8);

b8.addActionListener(listen);

JButton?b9?=?new?JButton("*");

p3.add(b9);

b9.addActionListener(listen);

JButton?b10?=?new?JButton("%");

p3.add(b10);

b10.addActionListener(listen);

JButton?b11?=?new?JButton("1");

p3.add(b11);

b11.addActionListener(listen);

JButton?b12?=?new?JButton("2");

p3.add(b12);

b12.addActionListener(listen);

JButton?b13?=?new?JButton("3");

p3.add(b13);

b13.addActionListener(listen);

JButton?b14?=?new?JButton("-");

p3.add(b14);

b14.addActionListener(listen);

JButton?b15?=?new?JButton("1/x");

p3.add(b15);

b15.addActionListener(listen);

JButton?b16?=?new?JButton("0");

p3.add(b16);

b16.addActionListener(listen);

JButton?b17?=?new?JButton("+/-");

p3.add(b17);

b17.addActionListener(listen);

JButton?b18?=?new?JButton(".");

p3.add(b18);

b18.addActionListener(listen);

JButton?b19?=?new?JButton("+");

p3.add(b19);

b19.addActionListener(listen);

JButton?b20?=?new?JButton("=");

p3.add(b20);

b20.addActionListener(listen);

f.add(p3,BorderLayout.SOUTH);

f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

f.pack();

f.setVisible(true);

}

public?static?void?main(String?args[]){

//調(diào)用方法，實(shí)現(xiàn)計(jì)算器

new?Cal().init();

}

}

本文題目：用java計(jì)算器界面代碼,java設(shè)計(jì)一個(gè)簡(jiǎn)單的計(jì)算器界面
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