JAVA 编写计算器 要代码最简单的

学java的时候自己编的，很简单，能够连续输入计算式后进行计算

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import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.FlowLayout;

import java.awt.Font;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.text.NumberFormat;

import java.util.ArrayList;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.JTextField;

/**简易计算器，能够进行简单的计算

*

* @see 2008.12.9

*/

public class CalculatorA

implements ActionListener{

private JFrame frame;

private JTextField field;

private JButton[] allButtons;

private JButton clearButton;

// private JButton backButton;

String result="";//保存结果

StringBuilder sb = new StringBuilder();//保存要进行的计算式

int x = 0; //用来判断上一次的事件类型

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

ArrayListString arrayList = new ArrayListString();//保存计算式，通过方法进行运算

public CalculatorA(){

frame = new JFrame("我的计算器v1.1");

frame.setLocation(300,300);

field = new JTextField(25);

allButtons = new JButton[16];

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

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

}

clearButton = new JButton("CLEAR");

// backButton = new JButton("——");

init();

setFondAndColor();

addEventHander();

}

public void init(){

frame.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(field);

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

centerPanel.add(allButtons[i]);

}

southPanel.add(clearButton);

//southPanel.add(backButton);

frame.add(northPanel,BorderLayout.NORTH);

frame.add(centerPanel,BorderLayout.CENTER);

frame.add(southPanel,BorderLayout.SOUTH);

}

//设置输入字体

public void setFondAndColor(){

field.setFont(new Font("宋体",Font.BOLD,24));

field.setBackground(new Color(100,200,200));

field.setForeground(Color.RED);

//设置字体从右起始

field.setHorizontalAlignment(JTextField.RIGHT);

}

public void showMi(){

frame.pack();

frame.setResizable(false);

frame.setVisible(true);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

public void addEventHander(){

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

allButtons[i].addActionListener(this);

}

clearButton.addActionListener(this);

// backButton.addActionListener(this);

}

@Override

public void actionPerformed(ActionEvent e) {

String str = e.getActionCommand();//取得当前事件返回的值

if("0123456789.".indexOf(str)!=-1){

if(x == 0){ //当x为0时表示还没有进行输入

result=str;

sb.append(str);

field.setText(str);

x = 1;

}

else if(x == 1){

result = result +str;

sb.append(str);

field.setText(result);

x = 1;

}

else if(x == 2){

sb.delete(0,sb.length());

result = result+str;

sb.append(str);

field.setText(result);

x = 1;

}

else if(x == 3){

result = str;

sb.delete(0,sb.length());

arrayList.clear();

field.setText(str);

sb.append(str);

field.setText(str);

x = 1;

}

else if(x == 4){

result ="";

sb.delete(0,sb.length());

arrayList.clear();

result = str;

sb.append(str);

field.setText(str);

x = 1;

}

else{

result = result +str;

sb.append(str);

field.setText(result);

x = 1;

}

}

else if("+*-/".indexOf(str)!=-1){

if(x == 0){

field.setText("");

x = 2;

}

else if(x == 1){

result = result + str;

arrayList.add(sb.toString());

arrayList.add(str);

sb.append(str);

field.setText(result);

x = 2;

}

else if(x == 2){

x = 2;

}

else if(x == 3){

field.setText(result+str);

arrayList.add(result);

arrayList.add(str);

result = result+str;

x = 2;

}

else if(x == 4){

result ="";

sb.delete(0,sb.length());

arrayList.clear();

x = 2;

}

else{

field.setText(result+str);

arrayList.add(result);

arrayList.add(str);

result = result+str;

x = 2;

}

}

else if("=".equals(str)){

if(x == 0){

field.setText("0");

arrayList.clear();

result = "0";

x = 3;

}

else if(x == 1){

try{

arrayList.add(sb.toString());

arrayList = getResult(arrayList);

result = arrayList.get(0);

field.setText(result);

arrayList.clear();

x = 3;

}catch(Exception e1){

field.setText("数据格式异常");

x = 0;

}

}

else if(x == 2){

field.setText("数据格式错误.....");

arrayList.clear();

x = 0;

}

else if(x == 3){

field.setText(result);

x = 3;

}

else if(x == 4){

result ="";

sb.delete(0,sb.length());

arrayList.clear();

x = 3;

}

else {

try{

arrayList.add(sb.toString());

arrayList = getResult(arrayList);

result = arrayList.get(0);

field.setText(result);

arrayList.clear();

x = 3;

}catch(Exception e1){

field.setText("数据格式异常");

x = 0;

}

}

}

else if("CLEAR".equals(str)){

arrayList.clear();

field.setText("0");

arrayList.add("0");

x = 4;

}

else{

if(result.length()1){

result = result.substring(0,result.length()-1);

if(sb.length()0){

sb.delete(sb.length()-1,sb.length());

}

else {

sb.delete(0,1);

}

field.setText(result);

x = 5;

}

else{

result = "";

sb.delete(0,sb.length());

arrayList.clear();

field.setText("0");

x = 0;

}

}

}

public static ArrayListString getResult(ArrayListString list){

String res = null;

String[] s = {"/","*","-","+"};

int i=0;

if(list.size()1){

for(;is.length;){

if(s[i].equals("/")){

for(int j=0;jlist.size();j++){

if(list.get(j).equals(s[i])){

res = Double.toString(Double.parseDouble(list.get(j-1))/Double.parseDouble(list.get(j+1)));

//本地的数据格式

NumberFormat nf = NumberFormat.getInstance();

res = nf.format(Double.parseDouble(res));

res = getChange(res);

list.set(j-1,res);

list.remove(j);

list.remove(j);

getResult(list);

}

}

i++;

}

else if(s[i].equals("*")){

for(int j=0;jlist.size();j++){

if(list.get(j).equals(s[i])){

res = Double.toString(Double.parseDouble(list.get(j-1))*Double.parseDouble(list.get(j+1)));

NumberFormat nf = NumberFormat.getInstance();

res = nf.format(Double.parseDouble(res));

res = getChange(res);

list.set(j-1,res);

list.remove(j);

list.remove(j);

getResult(list);

}

}

i++;

}

else if(s[i].equals("-")){

for(int j=0;jlist.size();j++){

if(list.get(j).equals(s[i])){

res = Double.toString(Double.parseDouble(list.get(j-1))-Double.parseDouble(list.get(j+1)));

NumberFormat nf = NumberFormat.getNumberInstance();

res = nf.format(Double.parseDouble(res));

res = getChange(res);

list.set(j-1,res);

list.remove(j);

list.remove(j);

getResult(list);

}

}

i++;

}

else {

for(int j=0;jlist.size();j++){

if(list.get(j).equals(s[i])){

res = Double.toString(Double.parseDouble(list.get(j-1))+Double.parseDouble(list.get(j+1)));

NumberFormat nf = NumberFormat.getInstance();

res = nf.format(Double.parseDouble(res));

res = getChange(res);

list.set(j-1,res);

list.remove(j);

list.remove(j);

getResult(list);

}

}

i++;

}

}

}

return list;

}

//对数字字符串进行排除不必要符号

public static String getChange(String res){

String s_temp = "";

char[] c = new char[res.length()];

for(int k=0;kc.length;k++){

c[k] = res.charAt(k);

}

for(int k=0;kc.length;k++){

if((c[k]= '0' c[k]= '9')|| c[k] == '.'){

s_temp += c[k];

}

}

return s_temp;

}

public static void main(String[] args){

new CalculatorA().showMi();

}

}

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。

java计算器代码

import java.awt.*;

import java.awt.event.*;

public class lvhaiya{

int tmp,sum,sum1,sum2=1,sum3=1;

String a,b,c,d;String s="";

Frame f=new Frame("计算器");

private String[]name={

"0","1","2","3","4","5","6","7","8","9","+","-","*","/","=","空格"

};

public Button[] button=new Button[name.length];

TextField t=new TextField("",30);

Panel p=new Panel();

Panel p1=new Panel();

Color color=new Color(100,170,90);

public lvhaiya(){

p1.setLayout(new GridLayout(5,5));

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

button[i]=new Button(name[i]);

p1.add(button[i]);

}

p.setLayout(new FlowLayout(FlowLayout.LEFT));

p.setBackground(color);

p.add(t);

f.add(p,BorderLayout.NORTH);

f.add(p1,BorderLayout.SOUTH);

f.pack();

f.setVisible(true);

f.addWindowListener( new WindowClose());

t.setText("0.");

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

button[i].addActionListener(new ButtonEventl());

}

}

public static void main(String[]args){

new lvhaiya();

}

class WindowClose extends WindowAdapter{

public void windouClosing(WindowEvent e){

System.exit(0);

}

}

class ButtonEventl implements ActionListener{

public void actionPerformed(ActionEvent e)throws ArithmeticException{

String command=e.getActionCommand();

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

sum=Integer.parseInt(t.getText())+sum;

t.setText(String.valueOf(sum));

a=t.getText();

s="";

}

else if(command.equals("-")){

sum1=Integer.parseInt(t.getText());

b=t.getText();

s="";

}

else if(command.equals("*")){

sum2=Integer.parseInt(t.getText())*sum2;

t.setText(String.valueOf(sum2));

c=t.getText();

s="";

}

else if(command.equals("/")){

sum3=Integer.parseInt(t.getText());

d=t.getText();

s="";

}

else if(command.equals("=")){

if(a!=null){

t.setText(String.valueOf(sum+tmp));

}

if(b!=null){

t.setText(String.valueOf(sum1-tmp));

}

if(c!=null){

t.setText(String.valueOf(sum2*tmp));

}

try{

if(d!=null){

t.setText(String.valueOf(sum3/tmp));

}

}

catch(ArithmeticException a){

t.setText("除数不能为零");

}

}

else if(command.equals("空格")){

sum=0;

a=null;

b=null;

c=null;

d=null;

sum1=0;

sum2=1;

sum3=1;

tmp=0;

t.setText("0");

s="";

}

else{

s=s+command;

t.setText(s);

tmp=Integer.parseInt(s);

}

}

}

}

//按钮可以自己美化一下 希望可以帮到你

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