java代碼寫(xiě)親戚計(jì)算器 最簡(jiǎn)單java計(jì)算器代碼
如何用JAVA語(yǔ)言編寫(xiě)計(jì)算器小程序？
具體代碼如下：
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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() {
//對(duì)圖形組件實(shí)例化
jf=new JFrame("任靜的計(jì)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();
}
//添加事件監(jiān)聽(tīng)
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("");
}
});
}
//事件處理
public void actionPerformed(ActionEvent e) {
//在這里完成事件處理 ?使計(jì)算器可以運(yùn)行
String action=e.getActionCommand();
if(action=="+"||action=="-"||action=="*"||action=="/"){
}
}
public void setFontAndColor(){
Font f=new Font("宋體",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();
}
}
JAVA 編寫(xiě)計(jì)算器 要代碼最簡(jiǎn)單的
學(xué)java的時(shí)候自己編的，很簡(jiǎn)單，能夠連續(xù)輸入計(jì)算式后進(jìn)行計(jì)算
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;
/**簡(jiǎn)易計(jì)算器，能夠進(jìn)行簡(jiǎn)單的計(jì)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="";//保存結(jié)果
StringBuilder sb = new StringBuilder();//保存要進(jìn)行的計(jì)算式
int x = 0; //用來(lái)判斷上一次的事件類(lèi)型
String str = "123+456-789*0.=/";
ArrayListString arrayList = new ArrayListString();//保存計(jì)算式，通過(guò)方法進(jìn)行運(yùn)算
public CalculatorA(){
frame = new JFrame("我的計(jì)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);
}
//設(shè)置輸入字體
public void setFondAndColor(){
field.setFont(new Font("宋體",Font.BOLD,24));
field.setBackground(new Color(100,200,200));
field.setForeground(Color.RED);
//設(shè)置字體從右起始
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();//取得當(dāng)前事件返回的值
if("0123456789.".indexOf(str)!=-1){
if(x == 0){ //當(dāng)x為0時(shí)表示還沒(méi)有進(jìn)行輸入
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("數(shù)據(jù)格式異常");
x = 0;
}
}
else if(x == 2){
field.setText("數(shù)據(jù)格式錯(cuò)誤.....");
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("數(shù)據(jù)格式異常");
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)));
//本地的數(shù)據(jù)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;
}
//對(duì)數(shù)字字符串進(jìn)行排除不必要符號(hào)
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();
}
}
親戚稱(chēng)呼計(jì)算器java代碼
計(jì)算器java代碼
import?java.awt.BorderLayout;
import?java.awt.Dimension;
import?java.awt.GridLayout;
import?java.awt.Toolkit;
import?java.awt.event.ActionEvent;
import?java.awt.event.ActionListener;
import?javax.swing.JButton;
import?javax.swing.JFrame;
import?javax.swing.JPanel;
import?javax.swing.SwingUtilities;
import?javax.swing.UIManager;
class?CalculatorPanel?extends?JPanel?{
private?JPanel?jp;?//?中間的面板
private?double?result;?//?計(jì)算結(jié)果
private?boolean?start;?//?用于判斷是否是首次輸入,true首次,false不是首次
private?boolean?flag;?//?用于判斷是否清空顯示區(qū)域的值,true需要,false不需要
private?String?lastCommand;?//?用于保存運(yùn)算符
JButton?display;?//?顯示區(qū)域
public?CalculatorPanel()?{
//?初始化各項(xiàng)值
result?=?0;
start?=?true;
flag?=?false;
lastCommand?=?"=";
//?設(shè)置CalculatorPanel這個(gè)面板的布局為框架布局
setLayout(new?BorderLayout());
//?這個(gè)按鈕用來(lái)顯示值的區(qū)域
display?=?new?JButton("0.0");
display.setEnabled(false);//?按鈕樣式設(shè)置為禁用樣式
//?用來(lái)初始化,清除用的
JButton?clear?=?new?JButton("clear");
clear.addActionListener(new?ActionListener()?{
@Override
public?void?actionPerformed(ActionEvent?e)?{
//?作初始化的操作
result?=?0;
start?=?true;
flag?=?false;
lastCommand?=?"=";
display.setText("0.0");
}
});
jp?=?new?JPanel();
//?將此面板布局設(shè)置為網(wǎng)格布局,4行4列
jp.setLayout(new?GridLayout(4,?4));
//?實(shí)例化監(jiān)聽(tīng)器對(duì)象
NumberAction?na?=?new?NumberAction();
CommandAction?ca?=?new?CommandAction();
makeButton("7",?na);
makeButton("8",?na);
makeButton("9",?na);
makeButton("/",?ca);
makeButton("4",?na);
makeButton("5",?na);
makeButton("6",?na);
makeButton("*",?ca);
makeButton("1",?na);
makeButton("2",?na);
makeButton("3",?na);
makeButton("-",?ca);
makeButton("0",?na);
makeButton(".",?na);
makeButton("+",?ca);
makeButton("=",?ca);
//?將面板,兩個(gè)按鍵加入到我的面板,實(shí)現(xiàn)計(jì)算器的界面
add(display,?BorderLayout.NORTH);
add(jp,?BorderLayout.CENTER);
add(clear,?BorderLayout.SOUTH);
}
private?void?makeButton(String?buttonName,?ActionListener?al)?{
JButton?jb?=?new?JButton(buttonName);
jp.add(jb);
jb.addActionListener(al);
}
//?數(shù)字監(jiān)聽(tīng)器
private?class?NumberAction?implements?ActionListener?{
@Override
public?void?actionPerformed(ActionEvent?e)?{
JButton?jb?=?(JButton)?e.getSource();?//?獲取事件源對(duì)象
String?input?=?jb.getText();?//?獲取事件源對(duì)象上的標(biāo)簽
if?(start)?{?//?首次輸入
//?一上就".",就什么也不做
if?(input.equals("."))?{
return;
}
//?如果是"0.0"的話(huà),就清空
if?(display.getText().equals("0.0"))?{
display.setText("");
}
start?=?false;//?改變是否首次輸入的標(biāo)記值
}?else?{
//?判斷顯示區(qū)域的值里面是否已經(jīng)有".",如果有,輸入的又是".",就什么都不做
if?(display.getText().indexOf(".")?!=?-1)?{
if?(input.equals("."))?{
return;
}
}
//?判斷顯示區(qū)域的值里面只有"-",輸入的又是".",就什么都不做
if?(display.getText().equals("-"))?{
if?(input.equals("."))?{
return;
}
}
//?判斷顯示區(qū)域的值如果是"0",輸入的不是".",就什么也不做
if?(display.getText().equals("0"))?{
if?(!input.equals("."))?{
return;
}
}
}
//?如果我點(diǎn)擊了運(yùn)算符以后,再輸入數(shù)字的話(huà),就要清空顯示區(qū)域的值
if?(flag)?{
display.setText("");
flag?=?false;//?還原初始值,不需要清空
}
display.setText(display.getText()?+?input);//?設(shè)置顯示區(qū)域的值
}
}
//?運(yùn)算符監(jiān)聽(tīng)器
private?class?CommandAction?implements?ActionListener?{
@Override
public?void?actionPerformed(ActionEvent?e)?{
JButton?jb?=?(JButton)?e.getSource();?//?獲取事件源對(duì)象
String?inputCommand?=?jb.getText();?//?獲取事件源對(duì)象上的標(biāo)簽
if?(start)?{//?首次輸入
//?一上就是"-"
if?(inputCommand.equals("-"))?{
display.setText("-");//?顯示區(qū)域的內(nèi)容設(shè)置為"-"
start?=?false;//?改變首次輸入的標(biāo)記
}
}?else?{
if?(!flag)?{//?如果flag=false不需要清空顯示區(qū)的值,就調(diào)用方法計(jì)算
calculate(Double.parseDouble(display.getText()));//?保存顯示區(qū)域的值,并計(jì)算
}
//?保存你點(diǎn)擊的運(yùn)算符
lastCommand?=?inputCommand;
flag?=?true;//?因?yàn)槲疫@里已經(jīng)輸入過(guò)運(yùn)算符,
}
}
}
//?計(jì)算用的方法
private?void?calculate(double?x)?{
if?(lastCommand.equals("+"))?{
result?+=?x;
}?else?if?(lastCommand.equals("-"))?{
result?-=?x;
}?else?if?(lastCommand.equals("*"))?{
result?*=?x;
}?else?if?(lastCommand.equals("/"))?{
result?/=?x;
}?else?if?(lastCommand.equals("="))?{
result?=?x;
}
display.setText(""?+?result);
}
}
class?MyFrameUitl?{
public?static?void?init(JFrame?jFrame,?Dimension?frameSize,?String?title,
String?iconFileName,?boolean?resizable)?{
Toolkit?tk?=?Toolkit.getDefaultToolkit();?//?系統(tǒng)工具包,可以讀取系統(tǒng)信息
Dimension?screenSize?=?tk.getScreenSize();//?獲取屏幕大小
//?獲取寬高
int?screenWidth?=?screenSize.width;
int?screenHeight?=?screenSize.height;
//?找中心點(diǎn)
int?centerX?=?screenWidth?/?2;
int?centerY?=?screenHeight?/?2;
//?解析窗體大小
int?frameWidth?=?frameSize.width;
int?frameHeight?=?frameSize.height;
//?設(shè)置窗體位置
jFrame.setBounds(centerX?-?frameWidth?/?2,?centerY?-?frameHeight?/?2,
frameWidth,?frameHeight);
jFrame.setTitle(title);//?設(shè)置標(biāo)題
if?(iconFileName?!=?null)?{
jFrame.setIconImage(tk.getImage(iconFileName));//?設(shè)置圖標(biāo)
}
//?設(shè)置皮膚com.sun.java.swing.plaf.windows.WindowsLookAndFeel
/**/
try?{
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
SwingUtilities.updateComponentTreeUI(jFrame);
}?catch?(Exception?e1)?{
e1.printStackTrace();
}
jFrame.setResizable(resizable);//?設(shè)置窗體是否可以改變大小
jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);?//?設(shè)置程序關(guān)閉動(dòng)作
jFrame.setVisible(true);//?顯示窗體
}
}
class?CalculatorFrame?extends?JFrame?{
public?CalculatorFrame()?{
add(new?CalculatorPanel());
MyFrameUitl.init(this,?new?Dimension(400,?300),?"簡(jiǎn)易計(jì)算器",?null,
false);
this.pack();//?讓組件按原始大小顯示,并且窗體的大小剛好能夠容納所有的組件
}
}
public?class?CalculatorTest?{
public?static?void?main(String[]?args)?{
new?CalculatorFrame();
}
}
運(yùn)行效果：
用java實(shí)現(xiàn)一個(gè)簡(jiǎn)單的計(jì)算器。
/*
* @(#)JCalculator.java 1.00 06/17/2015
*/
import?java.awt.*;
import?java.awt.event.*;
import?javax.swing.*;
/**
* A simple calculator program.
*?pI saw this program in a QQ group, and help a friend correct it./p
*
*?@author?Singyuen?Yip
*?@version?1.00 12/29/2009
*?@see?JFrame
*?@see?ActionListener
*/
public?class?JCalculator?extends?JFrame?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("Calculator");
// Add a panel.
JPanel panel1 =?new?JPanel(new?GridLayout(4, 4));
// panel1.setLayout(new GridLayout(4,4));
for?(i?= 0;?i??str.length;?i++) {
buttons[i] =?new?JButton(str[i]);
panel1.add(buttons[i]);
}
JPanel panel2 =?new?JPanel(new?BorderLayout());
// panel2.setLayout(new BorderLayout());
panel2.add("Center",?display);
panel2.add("East",?reset);
// JPanel panel3 = new Panel();
getContentPane().setLayout(new?BorderLayout());
getContentPane().add("North", panel2);
getContentPane().add("Center", panel1);
// Add action listener for each digit operator button.
for?(i?= 0;?i??str.length;?i++)
buttons[i].addActionListener(this);
// Add listener for "reset" button.
reset.addActionListener(this);
// Add listener for "display" button.
display.addActionListener(this);
// The "close" button "X".
addWindowListener(new?WindowCloser());
// Initialize the window size.
setSize(800, 800);
// Show the window.
// show(); Using show() while JDK version is below 1.5.
setVisible(true);
// Fit the certain size.
pack();
}
public?void?actionPerformed(ActionEvent e) {
Object target = e.getSource();
String label = e.getActionCommand();
if?(target ==?reset)
handleReset();
else?if?("0123456789.".indexOf(label) 0)
handleNumber(label);
else
handleOperator(label);
}
// Is the first digit pressed?
boolean?isFirstDigit?=?true;
/**
* Number handling.
*?@param?key the key of the button.
*/
public?void?handleNumber(String key) {
if?(isFirstDigit)
display.setText(key);
else?if?((key.equals(".")) (display.getText().indexOf(".") 0))
display.setText(display.getText() +?".");
else?if?(!key.equals("."))
display.setText(display.getText() + key);
isFirstDigit?=?false;
}
/**
* Reset the calculator.
*/
public?void?handleReset() {
display.setText("0");
isFirstDigit?=?true;
operator?=?"=";
}
double?number?= 0.0;
String?operator?=?"=";
/**
* Handling the operation.
*?@param?key pressed operator's key.
*/
public?void?handleOperator(String key) {
if?(operator.equals("+"))
number?+= Double.valueOf(display.getText());
else?if?(operator.equals("-"))
number?-= Double.valueOf(display.getText());
else?if?(operator.equals("*"))
number?*= Double.valueOf(display.getText());
else?if?(operator.equals("/"))
number?/= Double.valueOf(display.getText());
else?if?(operator.equals("="))
number?= Double.valueOf(display.getText());
display.setText(String.valueOf(number));
operator?= key;
isFirstDigit?=?true;
}
public?static?void?main(String[] args) {
new?JCalculator();
}
}
運(yùn)行界面：
用java語(yǔ)言,編寫(xiě)一個(gè)計(jì)算器
有一個(gè)現(xiàn)成的.你看看吧
import java.awt.event.ActionEvent;
public class Application extends JFrame {
protected String str = "";
protected boolean isChar = true;
protected boolean isEqual = false;
protected JTextField textField;
public Application() {
Listener listerner = new Listener(this);
getContentPane().setLayout(null);
JButton button = new JButton("7");
button.addActionListener(listerner);
button.setBounds(12, 69, 43, 27);
getContentPane().add(button);
textField = new JTextField();
textField.setText("0");
textField.setEditable(false);
textField.setHorizontalAlignment(JTextField.RIGHT);
textField.setBounds(12, 22, 377, 27);
getContentPane().add(textField);
textField.setColumns(10);
JButton button_1 = new JButton("8");
button_1.addActionListener(listerner);
button_1.setBounds(103, 69, 43, 27);
getContentPane().add(button_1);
JButton button_2 = new JButton("9");
button_2.addActionListener(listerner);
button_2.setBounds(182, 69, 43, 27);
getContentPane().add(button_2);
JButton button_3 = new JButton("4");
button_3.addActionListener(listerner);
button_3.setBounds(12, 106, 43, 27);
getContentPane().add(button_3);
JButton button_4 = new JButton("5");
button_4.addActionListener(listerner);
button_4.setBounds(103, 106, 43, 27);
getContentPane().add(button_4);
JButton button_5 = new JButton("6");
button_5.addActionListener(listerner);
button_5.setBounds(182, 106, 43, 27);
getContentPane().add(button_5);
JButton button_6 = new JButton("1");
button_6.addActionListener(listerner);
button_6.setBounds(12, 143, 43, 27);
getContentPane().add(button_6);
JButton button_7 = new JButton("2");
button_7.addActionListener(listerner);
button_7.setBounds(103, 143, 43, 27);
getContentPane().add(button_7);
JButton button_8 = new JButton("3");
button_8.addActionListener(listerner);
button_8.setBounds(182, 143, 43, 27);
getContentPane().add(button_8);
JButton button_9 = new JButton("+");
button_9.addActionListener(listerner);
button_9.setBounds(269, 72, 43, 27);
getContentPane().add(button_9);
JButton button_10 = new JButton("-");
button_10.addActionListener(listerner);
button_10.setBounds(346, 72, 43, 27);
getContentPane().add(button_10);
JButton button_11 = new JButton("*");
button_11.addActionListener(listerner);
button_11.setBounds(269, 109, 43, 27);
getContentPane().add(button_11);
JButton button_12 = new JButton("/");
button_12.addActionListener(listerner);
button_12.setBounds(346, 109, 43, 27);
getContentPane().add(button_12);
JButton button_13 = new JButton("=");
button_13.addActionListener(listerner);
button_13.setBounds(346, 143, 43, 27);
getContentPane().add(button_13);
JButton button_14 = new JButton("0");
button_14.addActionListener(listerner);
button_14.setBounds(103, 180, 43, 27);
getContentPane().add(button_14);
JButton btnReset = new JButton("reset");
btnReset.addActionListener(listerner);
btnReset.setBounds(269, 180, 118, 27);
getContentPane().add(btnReset);
JButton button_15 = new JButton(".");
button_15.addActionListener(listerner);
button_15.setBounds(269, 146, 43, 27);
getContentPane().add(button_15);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setResizable(false);
this.setSize(442, 260);
this.setLocationRelativeTo(null);
this.setVisible(true);
}
public static void main(String[] args) {
new Application();
}
}
class Listener implements ActionListener {
private Application app = null;
public Listener(Application app) {
this.app = app;
}
public void actionPerformed(ActionEvent e) {
String value = e.getActionCommand();
if (value.matches("[0-9.]")) {
if (app.isChar) {
app.textField.setText("");
app.isChar = false;
}
if (app.isEqual app.str.matches("[0-9.]*")) {
app.str = "";
app.isEqual = false;
}
app.str += value;
app.textField.setText(app.textField.getText() + value);
} else if (value.matches("[\\+\\-\\*/]")) {
if (!app.str.substring(app.str.length() - 1)
.matches("[\\+\\-\\*/]")) {
app.str += value;
app.isChar = true;
}
} else if ("=".equals(value)) {
app.isEqual = true;
if (app.str.substring(app.str.length() - 1).matches("[\\+\\-]")) {
app.str += "0";
} else if (app.str.substring(app.str.length() - 1)
.matches("[\\*/]")) {
app.str += "1";
}
Interpreter bsh = new Interpreter();
String obj = null;
try {
obj = bsh.eval(app.str).toString();
} catch (Exception exception) {
System.out.println(exception.getMessage());
}
System.out.println(app.str);
app.textField.setText(obj);
app.str = obj;
app.isChar = true;
} else {
app.str = "";
app.textField.setText("0");
}
}
}
用JAVA編寫(xiě)一個(gè)計(jì)算器
import?java.awt.BorderLayout;
import?java.awt.Color;
import?java.awt.GridLayout;
import?java.awt.event.ActionEvent;
import?java.awt.event.ActionListener;
import?javax.swing.ImageIcon;
import?javax.swing.JButton;
import?javax.swing.JFrame;
import?javax.swing.JPanel;
import?javax.swing.JTextField;
import?javax.swing.SwingConstants;
public?class?Jisuanqi?extends?JFrame?implements?ActionListener?{
/**
?*
?*/
private?static?final?long?serialVersionUID?=?1L;
Result?result?=?new?Result();?//?定義text的面板
Number_Key?number_key?=?new?Number_Key();?//?定義按鈕面板
//?當(dāng)點(diǎn)擊按鈕+、-、*、/時(shí)，com?=?true
boolean?com?=?false;
//?當(dāng)i=0時(shí)說(shuō)明是我們第一次輸入，字符串text不會(huì)累加
int?i?=?0;
//?存放text的內(nèi)容
String?text?=?"";
//?存放點(diǎn)擊按鈕+、-、*、/之前的數(shù)值
double?defbutton?=?0;
//?+、-、*、/的代號(hào)分別為1，2，3，4
int?symbol?=?0;
//?構(gòu)造函數(shù)
Jisuanqi()?{
super("WangJiao");?//?設(shè)定標(biāo)題
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);?//?設(shè)定關(guān)閉窗體時(shí)退出程序
JPanel?pane?=?new?JPanel();?//?定義主面板
pane.setLayout(new?BorderLayout());
setBounds(380,?220,?30,?80);?//?前兩個(gè)參數(shù)是在屏幕上顯示的坐標(biāo)，后兩個(gè)是大小
//?替換圖標(biāo)
ImageIcon?icon?=?new?ImageIcon("F:1.GIF");
//?Jisuanqi.class.getResource("APPLE.GIF")
//?);
setIconImage(icon.getImage());
pane.add(result,?BorderLayout.NORTH);
pane.add(number_key,?BorderLayout.CENTER);
pane.add(number_key.equal,?BorderLayout.SOUTH);
number_key.one.addActionListener(this);?//?對(duì)1按鈕添加監(jiān)聽(tīng)事件
number_key.two.addActionListener(this);?//?對(duì)2按鈕添加監(jiān)聽(tīng)事件
number_key.three.addActionListener(this);?//?對(duì)3按鈕添加監(jiān)聽(tīng)事件
number_key.four.addActionListener(this);?//?對(duì)4按鈕添加監(jiān)聽(tīng)事件
number_key.five.addActionListener(this);?//?對(duì)5按鈕添加監(jiān)聽(tīng)事件
number_key.six.addActionListener(this);?//?對(duì)6按鈕添加監(jiān)聽(tīng)事件
number_key.seven.addActionListener(this);?//?對(duì)7按鈕添加監(jiān)聽(tīng)事件
number_key.eight.addActionListener(this);?//?對(duì)8按鈕添加監(jiān)聽(tīng)事件
number_key.nine.addActionListener(this);?//?對(duì)9按鈕添加監(jiān)聽(tīng)事件
number_key.zero.addActionListener(this);?//?對(duì)0按鈕添加監(jiān)聽(tīng)事件
number_key.ce.addActionListener(this);?//?對(duì)置零按鈕添加監(jiān)聽(tīng)事件
number_key.plus.addActionListener(this);?//?對(duì)+按鈕添加監(jiān)聽(tīng)事件
number_key.equal.addActionListener(this);?//?對(duì)=按鈕添加監(jiān)聽(tīng)事件
number_key.sub.addActionListener(this);?//?對(duì)-按鈕添加監(jiān)聽(tīng)事件
number_key.mul.addActionListener(this);?//?對(duì)*按鈕添加監(jiān)聽(tīng)事件
number_key.div.addActionListener(this);?//?對(duì)/按鈕添加監(jiān)聽(tīng)事件
number_key.point.addActionListener(this);?//?對(duì).按鈕添加監(jiān)聽(tīng)事件
setContentPane(pane);
pack();?//?初始化窗體大小為正好盛放所有按鈕
}
//?各個(gè)按鈕觸發(fā)的事件
public?void?actionPerformed(ActionEvent?e)?{
/*
?*?如果是點(diǎn)擊數(shù)字按鈕那么先要判斷是否在此之前點(diǎn)擊了+、-、*、/、=，如果是那么com=true?如果沒(méi)有com=
?*?false;或者是否點(diǎn)擊數(shù)字鍵，如果是i?=?1,如果沒(méi)有?i?=?0;
?*/
if?(e.getSource()?==?number_key.one)?{
if?(com?||?i?==?0)?{
result.text.setText("1");
com?=?false;
i?=?1;
}?else?{
text?=?result.text.getText();
result.text.setText(text?+?"1");
}
}?else?if?(e.getSource()?==?number_key.two)?{
if?(com?||?i?==?0)?{
result.text.setText("2");
com?=?false;
i?=?1;
}?else?{
text?=?result.text.getText();
result.text.setText(text?+?"2");
}
}?else?if?(e.getSource()?==?number_key.three)?{
if?(com?||?i?==?0)?{
result.text.setText("3");
com?=?false;
i?=?1;
}?else?{
text?=?result.text.getText();
result.text.setText(text?+?"3");
}
}?else?if?(e.getSource()?==?number_key.four)?{
if?(com?||?i?==?0)?{
result.text.setText("4");
com?=?false;
i?=?1;
}?else?{
text?=?result.text.getText();
result.text.setText(text?+?"4");
}
}?else?if?(e.getSource()?==?number_key.five)?{
if?(com?||?i?==?0)?{
result.text.setText("5");
com?=?false;
i?=?1;
}?else?{
text?=?result.text.getText();
result.text.setText(text?+?"5");
}
}?else?if?(e.getSource()?==?number_key.six)?{
if?(com?||?i?==?0)?{
result.text.setText("6");
com?=?false;
i?=?1;
}?else?{
text?=?result.text.getText();
result.text.setText(text?+?"6");
}
}?else?if?(e.getSource()?==?number_key.seven)?{
if?(com?||?i?==?0)?{
result.text.setText("7");
com?=?false;
i?=?1;
}?else?{
text?=?result.text.getText();
result.text.setText(text?+?"7");
}
}?else?if?(e.getSource()?==?number_key.eight)?{
if?(com?||?i?==?0)?{
result.text.setText("8");
com?=?false;
i?=?1;
}?else?{
text?=?result.text.getText();
result.text.setText(text?+?"8");
}
}?else?if?(e.getSource()?==?number_key.nine)?{
if?(com?||?i?==?0)?{
result.text.setText("9");
com?=?false;
i?=?1;
}?else?{
text?=?result.text.getText();
result.text.setText(text?+?"9");
}
}
/*
?*?對(duì)于0這個(gè)按鈕有一定的說(shuō)法，在我的程序里不會(huì)出現(xiàn)如00000這樣的情況，我加了判斷條件就是
?*?如果text中的數(shù)值=0就要判斷在這個(gè)數(shù)值中是否有.存在?如果有那么就在原來(lái)數(shù)值基礎(chǔ)之上添?加0;否則保持原來(lái)的數(shù)值不變
?*/
else?if?(e.getSource()?==?number_key.zero)?{?//?result.text.getText()是得到text里內(nèi)容的意思
if?(com?||?i?==?0)?{
result.text.setText("0");
com?=?false;
i?=?1;
}?else?{
text?=?result.text.getText();
if?(Float.parseFloat(text)??0?||?Float.parseFloat(text)??0)?{?//?Float.parseFloat(text)就是類(lèi)型轉(zhuǎn)換了，下面都是一樣
result.text.setText(text?+?"0");
}?else?{
if?(text.trim().indexOf(".")?==?-1)?{
result.text.setText(text);
}?else?{
result.text.setText(text?+?"0");
}
}
}
}?else?if?(e.getSource()?==?number_key.ce)?{
result.text.setText("0");
i?=?0;
com?=?true;
//?text?=?"";
defbutton?=?0;
}
/*
?*?本程序不會(huì)讓一個(gè)數(shù)值中出現(xiàn)2個(gè)以上的小數(shù)點(diǎn).具體做法是:判斷是否已經(jīng)存在.存在就不添加,?不存在就添加.
?*/
else?if?(e.getSource()?==?number_key.point)?{
if?(com?||?i?==?0)?{
result.text.setText("0.");
com?=?false;
i?=?1;
}?else?{
text?=?result.text.getText();
if?(text.trim().indexOf(".")?==?-1)?{
result.text.setText(text?+?".");
}?else?{
result.text.setText(text);
}
}
}?//?獲得點(diǎn)擊+之前的數(shù)值
else?if?(e.getSource()?==?number_key.plus)?{
com?=?true;
i?=?0;
defbutton?=?Double.parseDouble(result.text.getText());
symbol?=?1;
}?//?獲得點(diǎn)擊-之前的數(shù)值
else?if?(e.getSource()?==?number_key.sub)?{
com?=?true;
i?=?0;
defbutton?=?Double.parseDouble(result.text.getText());
symbol?=?2;
}?//?獲得點(diǎn)擊*之前的數(shù)值
else?if?(e.getSource()?==?number_key.mul)?{
com?=?true;
i?=?0;
defbutton?=?Double.parseDouble(result.text.getText());
System.out.println(defbutton);
symbol?=?3;
}?//?獲得點(diǎn)擊/之前的數(shù)值
else?if?(e.getSource()?==?number_key.div)?{
com?=?true;
i?=?0;
defbutton?=?Double.parseDouble(result.text.getText());
symbol?=?4;
}?else?if?(e.getSource()?==?number_key.equal)?{
switch?(symbol)?{
case?1:?{?//?計(jì)算加法
double?ad?=?defbutton
+?Double.parseDouble(result.text.getText());
result.text.setText(ad?+?"");
i?=?0;
text?=?"";
break;
}
case?2:?{?//?計(jì)算減法
double?ad?=?defbutton
-?Double.parseDouble(result.text.getText());
result.text.setText(String.valueOf(ad));
i?=?0;
text?=?"";
break;
}
case?3:?{?//?計(jì)算乘法
double?ad?=?defbutton
*?Double.parseDouble(result.text.getText());
result.text.setText(ad?+?"");
i?=?0;
text?=?"";
break;
}
case?4:?{?//?計(jì)算除法
double?ad?=?defbutton
/?Double.parseDouble(result.text.getText());
result.text.setText(ad?+?"");
i?=?0;
text?=?"";
break;
}
}
System.out.println(com);
}
System.out.println(result.text.getText());
}
@SuppressWarnings("deprecation")
public?static?void?main(String[]?args)?{
Jisuanqi?loveyou?=?new?Jisuanqi();
loveyou.show();
}
}
//?計(jì)算器數(shù)字按鈕定義面板
class?Number_Key?extends?JPanel?{
/**
?*
?*/
private?static?final?long?serialVersionUID?=?1L;
JButton?zero?=?new?JButton("0");?//?數(shù)字鍵0
JButton?one?=?new?JButton("1");?//?數(shù)字鍵1
JButton?two?=?new?JButton("2");?//?數(shù)字鍵2
JButton?three?=?new?JButton("3");?//?數(shù)字鍵3
JButton?four?=?new?JButton("4");?//?數(shù)字鍵4
JButton?five?=?new?JButton("5");?//?數(shù)字鍵5
JButton?six?=?new?JButton("6");?//?數(shù)字鍵6
JButton?seven?=?new?JButton("7");?//?數(shù)字鍵7
JButton?eight?=?new?JButton("8");?//?數(shù)字鍵8
JButton?nine?=?new?JButton("9");?//?數(shù)字鍵9
JButton?plus?=?new?JButton("+");
JButton?sub?=?new?JButton("-");
JButton?mul?=?new?JButton("*");
JButton?div?=?new?JButton("/");
JButton?equal?=?new?JButton("=");
JButton?ce?=?new?JButton("清零");?//?置零鍵
JButton?point?=?new?JButton(".");
Number_Key()?{
setLayout(new?GridLayout(4,?4,?1,?1));?//?定義布局管理器為網(wǎng)格布局
setBackground(Color.blue);?//?設(shè)置背景顏色
//?添加按鈕
add(one);
add(two);
add(three);
add(four);
add(five);
add(six);
add(seven);
add(eight);
add(nine);
add(zero);
add(plus);
add(sub);
add(mul);
add(div);
add(point);
add(equal);
add(ce);
}
}
//?計(jì)算器顯示結(jié)果的窗體
class?Result?extends?JPanel?{
/**
?*
?*/
private?static?final?long?serialVersionUID?=?1L;
//?text先是輸入和結(jié)果
JTextField?text?=?new?JTextField("0");
@SuppressWarnings("deprecation")
Result()?{?//?講輸入的數(shù)字或得到的結(jié)果在text的右邊顯示
text.setHorizontalAlignment(SwingConstants.RIGHT);
text.enable(false);?//?文本框不能編輯
setLayout(new?BorderLayout());?//?設(shè)定布局管理器邊框布局
add(text,?BorderLayout.CENTER);?//?text放置在窗體的中間
}
}
直接復(fù)制?保存成Jisuanqi?.java可以直接運(yùn)行了
當(dāng)前標(biāo)題：java代碼寫(xiě)親戚計(jì)算器 最簡(jiǎn)單java計(jì)算器代碼
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