java计算器程序源代码 java编写简单计算器代码

计算器java代码

import java.awt.Color;

import java.awt.Font;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JTextField;

import javax.swing.WindowConstants;

import javax.swing.border.LineBorder;

class Normal{

double i,j;

public Normal(double num1,double num2){

i=num1;

j=num2;

}

public double puls(){

return i+j;

}

public double subtract(){

return i-j;

}

public double multiply(){

return i*j;

}

public double divide(){

return i/j;

}

public double surpuls(){

return i%j;

}

}

class scientific extends Normal{

public scientific(int num1, int num2) {

super(num1, num2);

}

}

public class calc extends JFrame{

public static void main(String[] args) {

viewNormal VN= new viewNormal("normal");

}

}

class viewNormal extends JFrame implements ActionListener{

JPanel jp1 = new JPanel(new GridLayout(4,3,5,5));

JPanel jp2 = new JPanel(new GridLayout(5,1,5,5));

JLabel jl;

JButton[] jb;

JButton jbs,jbo,jba,jbb,jbc,jby;

StringBuffer sb = new StringBuffer();

Normal normal;

int dot=0;

double fnum=0;

double lnum=0;

double result;

String sign=null;

public viewNormal(String title){

setTitle(title);

setLayout(null);

setVisible(true);

setBounds(200,200,305,350);

setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);

jb= new JButton[12];

for(int i=0;i9;i++){

jb[i]=new JButton(""+(i+1));

jp1.add(jb[i]);

jb[i].addActionListener(this);

}

jb[9]=new JButton(".");

jb[10]=new JButton("0");

jb[11]=new JButton("=");

jb[9].addActionListener(this);

jb[10].addActionListener(this);

jb[11].addActionListener(this);

jp1.add(jb[9]);

jp1.add(jb[10]);

jp1.add(jb[11]);

jp1.setBounds(10, 100, 200, 200);

jbs= new JButton("+");jbo= new JButton("-");jba= new JButton("*");

jbb= new JButton("/");jby= new JButton("%");jbc= new JButton("C");

jbs.addActionListener(this);jbo.addActionListener(this);jba.addActionListener(this);

jbb.addActionListener(this);jby.addActionListener(this);jbc.addActionListener(this);

//jp2.add(jby);

jp2.add(jbs);jp2.add(jbo);jp2.add(jba);jp2.add(jbb);jp2.add(jbc);

jp2.setBounds(215, 100, 70, 200);

jl= new JLabel("0",JLabel.RIGHT);

jl.setFont(new Font("Batang",Font.BOLD, 20));

jl.setBorder(new LineBorder(Color.black,2));

jl.setBackground(Color.white);

jl.setBounds(10, 40, 275, 50);

jl.setOpaque(true);

add(jl);

add(jp1);

add(jp2);

}

//+

public void sum(){

lnum=Double.parseDouble(sb.toString());

normal=new Normal(fnum,lnum);

fnum=normal.puls();

result=fnum;

}

//-

private void sub() {

System.out.println(sb.toString());

lnum=Double.parseDouble(sb.toString());

normal=new Normal(fnum,lnum);

fnum=normal.subtract();

result=fnum;

}

//*

private void mul() {

lnum=Double.parseDouble(sb.toString());

normal=new Normal(fnum,lnum);

fnum=normal.multiply();

result=fnum;

}

// /

private void div() {

lnum=Double.parseDouble(sb.toString());

normal=new Normal(fnum,lnum);

fnum=normal.divide();

result=fnum;

}

//%

private void sur() {

lnum=Double.parseDouble(sb.toString());

normal=new Normal(fnum,lnum);

fnum=normal.surpuls();

result=fnum;

}

// =

private void same(){

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

sum();

}

if(sign.equals("-")){

sub();

}

if(sign.equals("*")){

mul();

}

if(sign.equals("/")){

div();

}

if(sign.equals("%")){

sur();

}

}

//result

public void Result(){

if(result%1!=0)

jl.setText(""+result);

else

{

int i=(int)result;

jl.setText(""+i);

}

}

@Override

public void actionPerformed(ActionEvent e) {

//System.out.println(sb.toString());

// 1~9

for(int i=0;i9;i++){

if(e.getSource()==jb[i]!sb.toString().equals("0")){

sb.append(jb[i].getText());

jl.setText(sb.toString());

}

else if(e.getSource()==jb[i]sb.toString().equals("0")){

int d=sb.length();

sb.delete(0, d);

sb.append(jb[i].getText());

jl.setText(sb.toString());

}

}

// 0

if(e.getSource()==jb[10]!sb.toString().equals("0")){

sb.append(jb[10].getText());

jl.setText(sb.toString());

}

// .

if(e.getSource()==jb[9]dot==0!sb.toString().equals("")){

dot++;

sb.append(jb[9].getText());

jl.setText(sb.toString());

}

// =

if(e.getSource()==jb[11]!sb.toString().equals("")){

same();

Result();

int d=sb.length();

sb.delete(0, d);

dot=0;

}

// +

if(e.getSource()==jbs!sb.toString().equals("")){

if(sign!="+"sign!=null)

same();

else

sum();

sign ="+";

Result();

int d=sb.length();

sb.delete(0, d);

dot=0;

}

//-

if(e.getSource()==jbo!sb.toString().equals("")){

if(fnum==0)

fnum=2*Double.parseDouble(sb.toString());

if(sign!="-"sign!=null)

same();

else

sub();

sign ="-";

Result();

int d=sb.length();

sb.delete(0, d);

dot=0;

}

//*

if(e.getSource()==jba!sb.toString().equals("")){

if(fnum==0)

fnum=1;

if(sign!="*"sign!=null)

same();

else

mul();

sign ="*";

Result();

int d=sb.length();

sb.delete(0, d);

dot=0;

}

// /

if(e.getSource()==jbb!sb.toString().equals("")){

if(fnum==0)

fnum=Math.pow(Double.parseDouble(sb.toString()),2);

if(sign!="/"sign!=null)

same();

else

div();

sign ="/";

Result();

int d=sb.length();

sb.delete(0, d);

dot=0;

}

//%

// if(e.getSource()==jby!sb.toString().equals("")){

// if(fnum==0){

// fnum=Double.parseDouble(sb.toString());

// result=fnum;

// }

// else {

// if(sign!="%"sign!=null)

// same();

// else{

// lnum=Double.parseDouble(sb.toString());

// normal=new Normal(fnum,lnum);

// fnum=normal.surpuls();

// result=fnum;

// }

// }

// sign ="%";

// Result();

// int d=sb.length();

// sb.delete(0, d);

// dot=0;

// }

//clear

if(e.getSource()==jbc){

int d=sb.length();

sb.delete(0, d);

jl.setText("0");

dot=0;

fnum=0;

lnum=0;

sign=null;

}

}

}

class viewScientific extends viewNormal{

public viewScientific(String title){

super(title);

setBounds(200,200,800,500);

}

}

//等号以后输入符号用不了， String转 double 本来就有错误，你可以用我的扩展成科学型的。

相关问答

Q1: 用JAVA编写的科学计算器源代码

import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

class Counter extends WindowAdapter

{

static JFrame f=new JFrame("计算器");

static JTextField text1=new JTextField("0.");

static String source="";

static String cal="";

static String object="";

static boolean flag=false;

static boolean flag1=true;

static boolean flag2=false;

public void init()

{

try

{

Container c=f.getContentPane();

JPanel pan1=new JPanel();

JButton b1=new JButton("1");

JButton b2=new JButton("2");

JButton b3=new JButton("3");

JButton b4=new JButton("4");

JButton b5=new JButton("5");

JButton b6=new JButton("6");

JButton b7=new JButton("7");

JButton b8=new JButton("8");

JButton b9=new JButton("9");

JButton b0=new JButton("0");

JButton b11=new JButton("+");

JButton b12=new JButton("-");

JButton b13=new JButton("*");

JButton b14=new JButton("/");

JButton b15=new JButton(".");

JButton b16=new JButton("=");

JButton bclar=new JButton("清零");

text1.setHorizontalAlignment(JTextField.RIGHT);

c.add(text1,"North");

c.add(pan1);

A aa=new A();

Result re=new Result();

Opertion op=new Opertion();

Clar cl=new Clar();

b1.addActionListener(aa);

b2.addActionListener(aa);

b3.addActionListener(aa);

b4.addActionListener(aa);

b5.addActionListener(aa);

b6.addActionListener(aa);

b7.addActionListener(aa);

b8.addActionListener(aa);

b9.addActionListener(aa);

b0.addActionListener(aa);

b11.addActionListener(op);

b12.addActionListener(op);

b13.addActionListener(op);

b14.addActionListener(op);

b16.addActionListener(re);

b15.addActionListener(aa);

bclar.addActionListener(cl);

pan1.add(b1);

pan1.add(b2);

pan1.add(b3);

pan1.add(b11);

pan1.add(b4);

pan1.add(b5);

pan1.add(b6);

pan1.add(b12);

pan1.add(b7);

pan1.add(b8);

pan1.add(b9);

pan1.add(b13);

pan1.add(b0);

pan1.add(b15);

pan1.add(b16);

pan1.add(b14);

pan1.add(bclar);

f.setSize(200,220);

f.setVisible(true);

}

catch(Exception e)

{

System.out.println(e.getMessage());

}

}

class A implements ActionListener

{

public void actionPerformed(ActionEvent e)

{

String a=text1.getText();

String s=e.getActionCommand();

if(a.equals("0.")||a.equals("+")||a.equals("-")||a.equals("*")||a.equals("/"))

text1.setText(s);

else {

if(flag2)

{

text1.setText(s);

flag2=false;

}

else

text1.setText(a+s);

}

}

}

class Opertion implements ActionListener

{

public void actionPerformed(ActionEvent e)

{

cal=e.getActionCommand();

if(flag1==true)

source=text1.getText();

text1.setText(cal);

flag1=false;

flag=true;

}

}

class Result implements ActionListener

{

public void actionPerformed(ActionEvent e)

{

double num1;

num1=Double.parseDouble(source);

object=text1.getText();

double num2;

num2=Double.parseDouble(object);

double result=0;

if(cal.equals("+"))

result=num1+num2;

if(cal.equals("-"))

result=num1-num2;

if(cal.equals("*"))

result=num1*num2;

if(cal.equals("/"))

if(num2==0)

text1.setText("除数不能为0");

else

result=num1/num2;

String s1=Double.toString(result);

text1.setText(s1);

flag1=true;

flag2=true;

}

}

class Clar implements ActionListener

{

public void actionPerformed(ActionEvent e)

{

text1.setText("0.");

}

}

public static void main(String[] args)

{

Counter count=new Counter();

count.init();

}

public void windowClosing(WindowEvent e){

System.exit(1);

}

public void windowOpened(WindowEvent e){}

public void windowIconified(WindowEvent e){}

public void windowDeiconified(WindowEvent e){}

public void windowClosed(WindowEvent e){}

public void windowActivated(WindowEvent e){}

public void windowDeactivated(WindowEvent e){}

}

Q2: 编写java application程序实现一个简易计算器

Java计算器 源代码java计算器程序源代码：

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

/**********************Java计算器 主类*********************/

public class SunnyCalculator implements ActionListener {

JFrame f;

JMenu mEdit;

JMenu mView;

JMenu mHelp;

JMenuItem mCopy;

JMenuItem mPaste;

JTextField tResult;

JButton bNumber;

JButton bOperator;

JButton bOther;

JButton bM;

boolean isDouble=false;//是否为实数

int opFlag=-1;

static double t1=0,t2=0,t3=0,result=0;

static int opflag1=-1,opflag2=-1,flag=0,resflag=1;

int preOp,currentOp=0;//标准位

double op1=0,op2=0;//操作数

double n3;

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();

//Java计算器 构造器

public SunnyCalculator()

{

f = new JFrame("Sunny计算器_杨梅树java计算器程序源代码的盔甲");

Container contentPane = f.getContentPane();

/**************************Java计算器 菜单java计算器程序源代码的创建*****************************/

JMenuBar mBar = new JMenuBar();

mBar.setOpaque(true);

mEdit = new JMenu("编辑(E)");

mEdit.setMnemonic(KeyEvent.VK_E);

mCopy = new JMenuItem("复制(C)");

mEdit.add(mCopy);

mPaste = new JMenuItem("粘贴(P)");

mEdit.add(mPaste);

mView = new JMenu("查看(V)");

mView.setMnemonic(KeyEvent.VK_V);

mView.add(new JMenuItem("标准型"));

mView.add(new JMenuItem("科学型"));

mView.addSeparator();

mView.add(new JMenuItem("查看分组"));

mHelp = new JMenu("帮助(H)");

mHelp.setMnemonic(KeyEvent.VK_H);

mHelp.add(new JMenuItem("帮助主题"));

mHelp.addSeparator();

mHelp.add(new JMenuItem("关于计算器"));

mBar.add(mEdit);

mBar.add(mView);

mBar.add(mHelp);

f.setJMenuBar(mBar);

contentPane.setLayout(new BorderLayout());

JPanel pTop = new JPanel();

tResult = new JTextField("0.",26);

tResult.setHorizontalAlignment(JTextField.RIGHT);

tResult.setEditable(false);

pTop.add(tResult);

contentPane.add(pTop,BorderLayout.NORTH);

JPanel pBottom = new JPanel();

pBottom.setLayout(new BorderLayout());

JPanel pLeft = new JPanel();

pLeft.setLayout(new GridLayout(5,1,3,3));

bM = new JButton(" ");

bM.setEnabled(false);

pLeft.add(bM);

/*************************Java计算器 功能键定义***************************/

bOther = new JButton("MC");

bOther.addActionListener(this);

bOther.setForeground(Color.red);

bOther.setMargin(new Insets(3,2,3,2));

pLeft.add(bOther);

bOther = new JButton("MR");

bOther.addActionListener(this);

bOther.setForeground(Color.red);

bOther.setMargin(new Insets(3,2,3,2));

pLeft.add(bOther);

bOther = new JButton("MS");

bOther.addActionListener(this);

bOther.setForeground(Color.red);

bOther.setMargin(new Insets(3,2,3,2));

pLeft.add(bOther);

bOther = new JButton("M+");

bOther.addActionListener(this);

bOther.setForeground(Color.red);

bOther.setMargin(new Insets(3,2,3,2));

pLeft.add(bOther);

pBottom.add(pLeft,BorderLayout.WEST);

JPanel pRight = new JPanel();

pRight.setLayout(new BorderLayout());

JPanel pUp = new JPanel();

pUp.setLayout(new GridLayout(1,3,3,0));

bOther = new JButton("BackSpace");

bOther.addActionListener(this);

bOther.setForeground(Color.red);

bOther.setMargin(new Insets(3,0,3,5));

pUp.add(bOther);

bOther = new JButton("CE");

bOther.addActionListener(this);

bOther.setForeground(Color.red);

pUp.add(bOther);

bOther = new JButton("C");

bOther.addActionListener(this);

bOther.setForeground(Color.red);

pUp.add(bOther);

/***************************Java计算器 数字键盘区定义**************************/

JPanel pDown = new JPanel();

pDown.setLayout(new GridLayout(4,5,3,2));

bNumber = new JButton("7");

bNumber.setForeground(Color.blue);

bNumber.addActionListener(this);

bNumber.setMargin(new Insets(3,3,3,3));

pDown.add(bNumber);

bNumber = new JButton("8");

bNumber.setForeground(Color.blue);

bNumber.addActionListener(this);

bNumber.setMargin(new Insets(3,3,3,3));

pDown.add(bNumber);

bNumber = new JButton("9");

bNumber.setForeground(Color.blue);

bNumber.addActionListener(this);

bNumber.setMargin(new Insets(3,3,3,3));

pDown.add(bNumber);

bOperator = new JButton("/");

bOperator.setForeground(Color.red);

bOperator.addActionListener(this);

bOperator.setMargin(new Insets(3,0,3,0));

pDown.add(bOperator);

bOperator = new JButton("sqrt");

bOperator.addActionListener(this);

bOperator.setForeground(Color.red);

bOperator.setMargin(new Insets(3,0,3,0));

pDown.add(bOperator);

bNumber = new JButton("4");

bNumber.setForeground(Color.blue);

bNumber.addActionListener(this);

bNumber.setMargin(new Insets(3,3,3,3));

bNumber.setHorizontalTextPosition(JButton.LEFT);

pDown.add(bNumber);

bNumber = new JButton("5");

bNumber.setForeground(Color.blue);

bNumber.addActionListener(this);

bNumber.setMargin(new Insets(3,3,3,3));

pDown.add(bNumber);

bNumber = new JButton("6");

bNumber.setForeground(Color.blue);

bNumber.addActionListener(this);

bNumber.setMargin(new Insets(3,3,3,3));

pDown.add(bNumber);

bOperator = new JButton("*");

bOperator.setForeground(Color.red);

bOperator.addActionListener(this);

bOperator.setMargin(new Insets(3,3,3,3));

pDown.add(bOperator);

bOperator = new JButton("%");

bOperator.setForeground(Color.blue);

bOperator.addActionListener(this);

bOperator.setMargin(new Insets(3,3,3,3));

pDown.add(bOperator);

bNumber = new JButton("1");

bNumber.setForeground(Color.blue);

bNumber.addActionListener(this);

bNumber.setMargin(new Insets(3,3,3,3));

pDown.add(bNumber);

bNumber = new JButton("2");

bNumber.setForeground(Color.blue);

bNumber.addActionListener(this);

bNumber.setMargin(new Insets(3,3,3,3));

pDown.add(bNumber);

bNumber = new JButton("3");

bNumber.setForeground(Color.blue);

bNumber.addActionListener(this);

bNumber.setMargin(new Insets(3,3,3,3));

pDown.add(bNumber);

bOperator = new JButton("-");

bOperator.setForeground(Color.red);

bOperator.addActionListener(this);

bOperator.setMargin(new Insets(3,3,3,3));

pDown.add(bOperator);

bOperator = new JButton("1/x");

bOperator.setForeground(Color.blue);

bOperator.addActionListener(this);

pDown.add(bOperator);

bNumber = new JButton("0");

bNumber.setForeground(Color.blue);

bNumber.addActionListener(this);

bNumber.setMargin(new Insets(3,3,3,3));

pDown.add(bNumber);

bOperator = new JButton("+/-");

bOperator.setForeground(Color.blue);

bOperator.addActionListener(this);

bOperator.setMargin(new Insets(3,3,3,3));

pDown.add(bOperator);

bOperator = new JButton(".");

bOperator.setForeground(Color.blue);

bOperator.addActionListener(this);

bOperator.setMargin(new Insets(3,3,3,3));

pDown.add(bOperator);

bOperator = new JButton("+");

bOperator.setForeground(Color.blue);

bOperator.addActionListener(this);

bOperator.setMargin(new Insets(3,3,3,3));

pDown.add(bOperator);

bOperator = new JButton("=");

bOperator.setForeground(Color.blue);

bOperator.addActionListener(this);

bOperator.setMargin(new Insets(3,3,3,3));

pDown.add(bOperator);

pRight.add(pUp,BorderLayout.NORTH);

pRight.add(pDown,BorderLayout.SOUTH);

pBottom.add(pRight,BorderLayout.EAST);

contentPane.add(pBottom,BorderLayout.SOUTH);

f.setSize(new Dimension(320,256));

f.setResizable(false);

f.setVisible(true);

f.addWindowListener(new WindowAdapter()

{

public void windowClosing(WindowEvent e)

{

System.exit(0);

}

}

);

}

/************************Java计算器 计算方法区***************************/

public void actionPerformed(ActionEvent e)

{

String s = e.getActionCommand();

if(s.equals("复制(C)"))

{

String temp = tResult.getText().trim();

copyBoard.replace(0, copyBoard.length(), temp);

mPaste.setEnabled(true);

}

else if(s.equals("粘贴(p)"))

{

tResult.setText(copyBoard.toString());

}

else if(s.equals("CE"))

{

//如果是CE则清除文本框

tResult.setText("0.");

}

else if(s.equals("BackSpace"))

{

if(!tResult.getText().trim().equals("0."))

{

//如果文本框中有内容

if(str.length()!=1  str.length()!=0)

{

tResult.setText(str.delete(str.length()-1,str.length()).toString());

}

else

{

tResult.setText("0.");

str.setLength(0);

}

}

op2 = Double.parseDouble(tResult.getText().trim());

}

else if(s.equals("C"))

{

//如果是C删除当前计算

tResult.setText("0.");

op1 = op2 = 0;

str.replace(0, str.length(), " ");

preOp = currentOp = 0;

}

else if(s.equals("MC"))

{

//如果是MC则清除缓冲区

String temp = "";

memory.replace(0, memory.length(), temp);

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

tResult.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

String s1 = tResult.getText().trim();

memory.replace(0, memory.length(), s1);

bM.setText("M");

}

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 = tResult.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("1/x"))

{

//如果按键为1/x则将文本框中的数据为它的倒数

String temp = tResult.getText().trim();

double dtemp = Double.parseDouble(temp);

tResult.setText(""+1/dtemp);

}

else if(s.equals("sqrt"))

{

//如果按键为sqrt则将文本框中的内容求平方根

String temp = tResult.getText().trim();

double dtemp = Double.parseDouble(temp);

tResult.setText(""+Math.sqrt(dtemp));

}

else if(s.equals("+"))

{

str.setLength(0);

if(currentOp==0)

{

preOp = currentOp = 1;

op2 = 0;

tResult.setText(""+op1);

}

else

{

currentOp = preOp;

preOp = 1;

switch(currentOp){

case 1:

op1 += op2;

tResult.setText(""+op1);

break;

case 2:

op1 -= op2;

tResult.setText(""+op1);

break;

case 3:

op1 *= op2;

tResult.setText(""+op1);

break;

case 4:

op1 /= op2;

tResult.setText(""+op1);

break;

}

}

}

else if(s.equals("-")){

str.setLength(0);

if(currentOp==0)

{

preOp=currentOp=2;//op1=op2;op2=0;

tResult.setText(""+op1);

}

else

{

currentOp =preOp;

preOp =2;

switch(currentOp){

case 1:op1=op1+op2;tResult.setText(""+op1);break;

case 2:op1=op1-op2;tResult.setText(""+op1);break;

case 3:op1=op1*op2;tResult.setText(""+op1);break;

case 4:op1=op1/op2;tResult.setText(""+op1);break;

}

}

}

else if(s.equals("*"))//*

{

str.setLength(0);

if(currentOp==0)

{

preOp=currentOp=3;//op1=op2;op2=1;

tResult.setText(""+op1);//op1=op2;

}

else

{

currentOp =preOp;

preOp =3;

switch(currentOp){

case 1:op1=op1+op2;tResult.setText(""+op1);break;

case 2:op1=op1-op2;tResult.setText(""+op1);break;

case 3:op1=op1*op2;tResult.setText(""+op1);break;

case 4:op1=op1/op2;tResult.setText(""+op1);break;

}

}

}

else if(s.equals("/"))// /

{

str.setLength(0);

if(currentOp==0)

{

preOp=currentOp=4;//op2=1;

tResult.setText(""+op1);//op1=op2;

}

else

{

currentOp =preOp;

preOp =4;

switch(currentOp){

case 1:op1=op1+op2;tResult.setText(""+op1);break;

case 2:op1=op1-op2;tResult.setText(""+op1);break;

case 3:op1=op1*op2;tResult.setText(""+op1);break;

case 4:op1=op1/op2;tResult.setText(""+op1);break;

}

}

}

else if(s.equals("="))// =

{

if(currentOp==0)

{

str.setLength(0);

tResult.setText(""+op2);

}

else

{

str.setLength(0);

currentOp =preOp;

switch(currentOp){

case 1:op1=op1+op2;tResult.setText(""+op1);break;

case 2:op1=op1-op2;tResult.setText(""+op1);break;

case 3:op1=op1*op2;tResult.setText("qu

Q3: java 计算器代码

import javax.swing.*;

import javax.swing.border.Border;

import java.awt.*;

import java.awt.event.ActionListener;

import java.awt.event.ActionEvent;

import java.math.BigDecimal;

import java.math.RoundingMode;

import java.util.HashMap;

/**

* java计算器程序源代码我java计算器程序源代码的计算器。Cheshi 继承于 JFramejava计算器程序源代码，是计算器的界面

c*/

public class Cheshi extends JFrame {

private Border border = BorderFactory.createEmptyBorder(5, 5, 5, 5);

private JTextField textbox = new JTextField("0");

private CalculatorCore core = new CalculatorCore();

private ActionListener listener = new ActionListener() {

public void actionPerformed(ActionEvent e) {

JButton b = (JButton) e.getSource();

String label = b.getText();

String result = core.process(label);

textbox.setText(result);

}

};

public Cheshi(String title) throws HeadlessException {

super(title); // 调用父类构造方法

setupFrame(); // 调整窗体属性

setupControls(); // 创建控件

}

private void setupControls() {

setupDisplayPanel(); // 创建文本面板

setupButtonsPanel(); // 创建按钮面板

}

// 创建按钮面板并添加按钮

private void setupButtonsPanel() {

JPanel panel = new JPanel();

panel.setBorder(border);

panel.setLayout(new GridLayout(4, 5, 3, 3));

createButtons(panel, new String[]{

"7", "8", "9", "+", "C",

"4", "5", "6", "-", "CE",

"1", "2", "3", "*", "", // 空字符串表示这个位置没有按钮

"0", ".", "=", "/", ""

});

this.add(panel, BorderLayout.CENTER);

}

/**

* 在指定的面板上创建按钮

*

* @param panel 要创建按钮的面板

* @param labels 按钮文字

*/

private void createButtons(JPanel panel, String[] labels) {

for (String label : labels) {

// 如果 label 为空，则表示创建一个空面板。否则创建一个按钮。

if (label.equals("")) {

panel.add(new JPanel());

} else {

JButton b = new JButton(label);

b.addActionListener(listener); // 为按钮添加侦听器

panel.add(b);

}

}

}

// 设置显示面板，用一个文本框来作为计算器的显示部分。

private void setupDisplayPanel() {

JPanel panel = new JPanel();

panel.setLayout(new BorderLayout());

panel.setBorder(border);

setupTextbox();

panel.add(textbox, BorderLayout.CENTER);

this.add(panel, BorderLayout.NORTH);

}

// 调整文本框

private void setupTextbox() {

textbox.setHorizontalAlignment(JTextField.RIGHT); // 文本右对齐

textbox.setEditable(false); // 文本框只读

textbox.setBackground(Color.white); // 文本框背景色为白色

}

// 调整窗体

private void setupFrame() {

this.setDefaultCloseOperation(EXIT_ON_CLOSE); // 当窗体关闭时程序结束

this.setLocation(100, 50); // 设置窗体显示在桌面上的位置

this.setSize(300, 200); // 设置窗体大小

this.setResizable(false); // 窗体大小固定

}

// 程序入口

public static void main(String[] args) throws Exception {

UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());

Cheshi frame = new Cheshi("我的计算器");

frame.setVisible(true); // 在桌面上显示窗体

}

}

/**

* 计算器核心逻辑。这个逻辑只能处理 1~2 个数的运算。

*/

class CalculatorCore {

private String displayText = "0"; // 要显示的文本

boolean reset = true;

private BigDecimal number1, number2;

private String operator;

private HashMapString, Operator operators = new HashMapString, Operator();

private HashMapString, Processor processors = new HashMapString, Processor();

CalculatorCore() {

setupOperators();

setupProcessors();

}

// 为每种命令添加处理方式

private void setupProcessors() {

processors.put("[0-9]", new Processor() {

public void calculate(String command) {

numberClicked(command);

}

});

processors.put("\\.", new Processor() {

public void calculate(String command) {

dotClicked();

}

});

processors.put("=", new Processor() {

public void calculate(String command) {

equalsClicked();

}

});

processors.put("[+\\-*/]", new Processor() {

public void calculate(String command) {

operatorClicked(command);

}

});

processors.put("C", new Processor() {

public void calculate(String command) {

clearClicked();

}

});

processors.put("CE", new Processor() {

public void calculate(String command) {

clearErrorClicked();

}

});

}

// 为每种 operator 添加处理方式

private void setupOperators() {

operators.put("+", new Operator() {

public BigDecimal process(BigDecimal number1, BigDecimal number2) {

return number1.add(number2);

}

});

operators.put("-", new Operator() {

public BigDecimal process(BigDecimal number1, BigDecimal number2) {

return number1.subtract(number2);

}

});

operators.put("*", new Operator() {

public BigDecimal process(BigDecimal number1, BigDecimal number2) {

return number1.multiply(number2);

}

});

operators.put("/", new Operator() {

public BigDecimal process(BigDecimal number1, BigDecimal number2) {

return number1.divide(number2, 30, RoundingMode.HALF_UP);

}

});

}

// 根据命令处理。这里的命令实际上就是按钮文本。

public String process(String command) {

for (String pattern : processors.keySet()) {

if (command.matches(pattern)) {

processors.get(pattern).calculate(command);

break;

}

}

return displayText;

}

// 当按下 CE 时

private void clearErrorClicked() {

if (operator == null) {

number1 = null;

} else {

number2 = null;

}

displayText = "0";

reset = true;

}

// 当按下 C 时，将计算器置为初始状态。

private void clearClicked() {

number1 = null;

number2 = null;

operator = null;

displayText = "0";

reset = true;

}

// 当按下 = 时

private void equalsClicked() {

calculateResult();

number1 = null;

number2 = null;

operator = null;

reset = true;

}

// 计算结果

private void calculateResult() {

number2 = new BigDecimal(displayText);

Operator oper = operators.get(operator);

if (oper != null) {

BigDecimal result = oper.process(number1, number2);

displayText = result.toString();

}

}

// 当按下 +-*/ 时（这里也可以扩展成其java计算器程序源代码他中间操作符）

private void operatorClicked(String command) {

if (operator != null) {

calculateResult();

}

number1 = new BigDecimal(displayText);

operator = command;

reset = true;

}

// 当按下 . 时

private void dotClicked() {

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

displayText += ".";

} else if (reset) {

displayText = "0.";

}

reset = false;

}

// 当按下 0-9 时

private void numberClicked(String command) {

if (reset) {

displayText = command;

} else {

displayText += command;

}

reset = false;

}

// 运算符处理接口

interface Operator {

BigDecimal process(BigDecimal number1, BigDecimal number2);

}

// 按钮处理接口

interface Processor {

void calculate(String command);

}

}

Q4: java编写计算器的源程序？？？？

import javax.swing.*;

import java.awt.event.*;

import java.awt.*;

public class Calculator extends JFrame implements ActionListener {

private JFrame jf;

private JButton[] allButtons;

private JButton clearButton;

private JTextField jtf;

public Calculator() {

//对图形组件实例化

jf=new JFrame("任静的计算器1.0：JAVA版");

jf.addWindowListener(new WindowAdapter(){

public void windowClosing(){

System.exit(0);

}

});

allButtons=new JButton[16];

clearButton=new JButton("清除");

jtf=new JTextField(25);

jtf.setEditable(false);

String str="123+456-789*0.=/";

for(int i=0;iallButtons.length;i++){

allButtons[i]=new JButton(str.substring(i,i+1));

}

}

public void init(){

//完成布局

jf.setLayout(new BorderLayout());

JPanel northPanel=new JPanel();

JPanel centerPanel=new JPanel();

JPanel southPanel=new JPanel();

northPanel.setLayout(new FlowLayout());

centerPanel.setLayout(new GridLayout(4,4));

southPanel.setLayout(new FlowLayout());

northPanel.add(jtf);

for(int i=0;i16;i++){

centerPanel.add(allButtons[i]);

}

southPanel.add(clearButton);

jf.add(northPanel,BorderLayout.NORTH);

jf.add(centerPanel,BorderLayout.CENTER);

jf.add(southPanel,BorderLayout.SOUTH);

addEventHandler();

}

//添加事件监听

public void addEventHandler(){

jtf.addActionListener(this);

for(int i=0;iallButtons.length;i++){

allButtons[i].addActionListener(this);

}

clearButton.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e) {

// TODO Auto-generated method stub

Calculator.this.jtf.setText("");

}

});

}

//事件处理

public void actionPerformed(ActionEvent e) {

//在这里完成事件处理 使计算器可以运行

String action=e.getActionCommand();

if(action=="+"||action=="-"||action=="*"||action=="/"){

}

}

public void setFontAndColor(){

Font f=new Font("宋体",Font.BOLD,24);

jtf.setFont(f);

jtf.setBackground(new Color(0x8f,0xa0,0xfb));

for(int i=0;i16;i++){

allButtons[i].setFont(f);

allButtons[i].setForeground(Color.RED);

}

}

public void showMe(){

init();

setFontAndColor();

jf.pack();

jf.setVisible(true);

jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

public static void main(String[] args){

new Calculator().showMe();

}

}

Q5: java计算器的源代码

import java.awt.*;

import java.awt.event.*;

import java.lang.*;

import javax.swing.*;

public class Counter extends Frame

{

//声明三个面板java计算器程序源代码的布局

GridLayout gl1,gl2,gl3;

Panel p0,p1,p2,p3;

JTextField tf1;

TextField tf2;

Button b0,b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13,b14,b15,b16,b17,b18,b19,b20,b21,b22,b23,b24,b25,b26;

StringBuffer str;//显示屏所显示的字符串

double x,y;//x和y都是运算数

int z;//Z表示单击java计算器程序源代码了那一个运算符.0表示"+",1表示"-",2表示"*",3表示"/"

static double m;//记忆的数字

public Counter()

{

gl1=new GridLayout(1,4,10,0);//实例化三个面板的布局

gl2=new GridLayout(4,1,0,15);

gl3=new GridLayout(4,5,10,15);

tf1=new JTextField(27);//显示屏

tf1.setHorizontalAlignment(JTextField.RIGHT);

tf1.setEnabled(false);

tf1.setText("0");

tf2=new TextField(10);//显示记忆的索引值

tf2.setEditable(false);

//实例化所有按钮、设置其前景色并注册监听器

b0=new Button("Backspace");

b0.setForeground(Color.red);

b0.addActionListener(new Bt());

b1=new Button("CE");

b1.setForeground(Color.red);

b1.addActionListener(new Bt());

b2=new Button("C");

b2.setForeground(Color.red);

b2.addActionListener(new Bt());

b3=new Button("MC");

b3.setForeground(Color.red);

b3.addActionListener(new Bt());

b4=new Button("MR");

b4.setForeground(Color.red);

b4.addActionListener(new Bt());

b5=new Button("MS");

b5.setForeground(Color.red);

b5.addActionListener(new Bt());

b6=new Button("M+");

b6.setForeground(Color.red);

b6.addActionListener(new Bt());

b7=new Button("7");

b7.setForeground(Color.blue);

b7.addActionListener(new Bt());

b8=new Button("8");

b8.setForeground(Color.blue);

b8.addActionListener(new Bt());

b9=new Button("9");

b9.setForeground(Color.blue);

b9.addActionListener(new Bt());

b10=new Button("/");

b10.setForeground(Color.red);

b10.addActionListener(new Bt());

b11=new Button("sqrt");

b11.setForeground(Color.blue);

b11.addActionListener(new Bt());

b12=new Button("4");

b12.setForeground(Color.blue);

b12.addActionListener(new Bt());

b13=new Button("5");

b13.setForeground(Color.blue);

b13.addActionListener(new Bt());

b14=new Button("6");

b14.setForeground(Color.blue);

b14.addActionListener(new Bt());

b15=new Button("*");

b15.setForeground(Color.red);

b15.addActionListener(new Bt());

b16=new Button("%");

b16.setForeground(Color.blue);

b16.addActionListener(new Bt());

b17=new Button("1");

b17.setForeground(Color.blue);

b17.addActionListener(new Bt());

b18=new Button("2");

b18.setForeground(Color.blue);

b18.addActionListener(new Bt());

b19=new Button("3");

b19.setForeground(Color.blue);

b19.addActionListener(new Bt());

b20=new Button("-");

b20.setForeground(Color.red);

b20.addActionListener(new Bt());

b21=new Button("1/X");

b21.setForeground(Color.blue);

b21.addActionListener(new Bt());

b22=new Button("0");

b22.setForeground(Color.blue);

b22.addActionListener(new Bt());

b23=new Button("+/-");

b23.setForeground(Color.blue);

b23.addActionListener(new Bt());

b24=new Button(".");

b24.setForeground(Color.blue);

b24.addActionListener(new Bt());

b25=new Button("+");

b25.setForeground(Color.red);

b25.addActionListener(new Bt());

b26=new Button("=");

b26.setForeground(Color.red);

b26.addActionListener(new Bt());

//实例化四个面板

p0=new Panel();

p1=new Panel();

p2=new Panel();

p3=new Panel();

//创建一个空字符串缓冲区

str=new StringBuffer();

//添加面板p0中的组件和设置其在框架中的位置和大小

p0.add(tf1);

p0.setBounds(10,25,300,40);

//添加面板p1中的组件和设置其在框架中的位置和大小

p1.setLayout(gl1);

p1.add(tf2);

p1.add(b0);

p1.add(b1);

p1.add(b2);

p1.setBounds(10,65,300,25);

//添加面板p2中的组件并设置其的框架中的位置和大小

p2.setLayout(gl2);

p2.add(b3);

p2.add(b4);

p2.add(b5);

p2.add(b6);

p2.setBounds(10,110,40,150);

//添加面板p3中的组件并设置其在框架中的位置和大小

p3.setLayout(gl3);//设置p3的布局

p3.add(b7);

p3.add(b8);

p3.add(b9);

p3.add(b10);

p3.add(b11);

p3.add(b12);

p3.add(b13);

p3.add(b14);

p3.add(b15);

p3.add(b16);

p3.add(b17);

p3.add(b18);

p3.add(b19);

p3.add(b20);

p3.add(b21);

p3.add(b22);

p3.add(b23);

p3.add(b24);

p3.add(b25);

p3.add(b26);

p3.setBounds(60,110,250,150);

//设置框架中的布局为空布局并添加4个面板

setLayout(null);

add(p0);

add(p1);

add(p2);

add(p3);

setResizable(false);//禁止调整框架的大小

//匿名类关闭窗口

addWindowListener(new WindowAdapter(){

public void windowClosing(WindowEvent e1)

{

System.exit(0);

}

});

setBackground(Color.lightGray);

setBounds(100,100,320,280);

setVisible(true);

}

//构造监听器

class Bt implements ActionListener

{

public void actionPerformed(ActionEvent e2)

{

try{

if(e2.getSource()==b1)//选择"CE"清零

{

tf1.setText("0");//把显示屏清零

str.setLength(0);//清空字符串缓冲区以准备接收新的输入运算数

}

else if(e2.getSource()==b2)//选择"C"清零

{

tf1.setText("0");//把显示屏清零

str.setLength(0);

}

else if(e2.getSource()==b23)//单击"+/-"选择输入的运算数是正数还是负数

{

x=Double.parseDouble(tf1.getText().trim());

tf1.setText(""+(-x));

}

else if(e2.getSource()==b25)//单击加号按钮获得x的值和z的值并清空y的值

{

x=Double.parseDouble(tf1.getText().trim());

str.setLength(0);//清空缓冲区以便接收新的另一个运算数

y=0d;

z=0;

}

else if(e2.getSource()==b20)//单击减号按钮获得x的值和z的值并清空y的值

{

x=Double.parseDouble(tf1.getText().trim());

str.setLength(0);

y=0d;

z=1;

}

else if(e2.getSource()==b15)//单击乘号按钮获得x的值和z的值并清空y的值

{

x=Double.parseDouble(tf1.getText().trim());

str.setLength(0);

y=0d;

z=2;

}

else if(e2.getSource()==b10)//单击除号按钮获得x的值和z的值并空y的值

{

x=Double.parseDouble(tf1.getText().trim());

str.setLength(0);

y=0d;

z=3;

}

else if(e2.getSource()==b26)//单击等号按钮输出计算结果

{

str.setLength(0);

switch(z)

{

case 0 : tf1.setText(""+(x+y));break;

case 1 : tf1.setText(""+(x-y));break;

case 2 : tf1.setText(""+(x*y));break;

case 3 : tf1.setText(""+(x/y));break;

}

}

else if(e2.getSource()==b24)//单击"."按钮输入小数

{

if(tf1.getText().trim().indexOf(′.′)!=-1)//判断字符串中是否已经包含了小数点

{

}

else//如果没数点有小

{

if(tf1.getText().trim().equals("0"))//如果初时显示为0

{

str.setLength(0);

tf1.setText((str.append("0"+e2.getActionCommand())).toString());

}

else if(tf1.getText().trim().equals(""))//如果初时显示为空则不做任何操作

{

}

else

{

tf1.setText(str.append(e2.getActionCommand()).toString());

}

}

y=0d;

}

else if(e2.getSource()==b11)//求平方根

{

x=Double.parseDouble(tf1.getText().trim());

tf1.setText("数字格式异常");

if(x0)

tf1.setText("负数没有平方根");

else

tf1.setText(""+Math.sqrt(x));

str.setLength(0);

y=0d;

}

else if(e2.getSource()==b16)//单击了"%"按钮

{

x=Double.parseDouble(tf1.getText().trim());

tf1.setText(""+(0.01*x));

str.setLength(0);

y=0d;

}

else if(e2.getSource()==b21)//单击了"1/X"按钮

{

x=Double.parseDouble(tf1.getText().trim());

if(x==0)

{

tf1.setText("除数不能为零");

}

else

{

tf1.setText(""+(1/x));

}

str.setLength(0);

y=0d;

}

else if(e2.getSource()==b3)//MC为清除内存

{

m=0d;

tf2.setText("");

str.setLength(0);

}

else if(e2.getSource()==b4)//MR为重新调用存储的数据

{

if(tf2.getText().trim()!="")//有记忆数字

{

tf1.setText(""+m);

}

}

else if(e2.getSource()==b5)//MS为存储显示的数据

{

m=Double.parseDouble(tf1.getText().trim());

tf2.setText("M");

tf1.setText("0");

str.setLength(0);

}

else if(e2.getSource()==b6)//M+为将显示的数字与已经存储的数据相加要查看新的数字单击MR

{

m=m+Double.parseDouble(tf1.getText().trim());

}

else//选择的是其java计算器程序源代码他的按钮

{

if(e2.getSource()==b22)//如果选择的是"0"这个数字键

{

if(tf1.getText().trim().equals("0"))//如果显示屏显示的为零不做操作

{

}

else

{

tf1.setText(str.append(e2.getActionCommand()).toString());

y=Double.parseDouble(tf1.getText().trim());

}

}

else if(e2.getSource()==b0)//选择的是“BackSpace”按钮

{

if(!tf1.getText().trim().equals("0"))//如果显示屏显示的不是零

{

if(str.length()!=1)

{

tf1.setText(str.delete(str.length()-1,str.length()).toString());//可能抛出字符串越界异常

}

else

{

tf1.setText("0");

str.setLength(0);

}

}

y=Double.parseDouble(tf1.getText().trim());

}

else//其他的数字键

{

tf1.setText(str.append(e2.getActionCommand()).toString());

y=Double.parseDouble(tf1.getText().trim());

}

}

}

catch(NumberFormatException e){

tf1.setText("数字格式异常");

}

catch(StringIndexOutOfBoundsException e){

tf1.setText("字符串索引越界");

}

}

}

public static void main(String args[])

{

new Counter();

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