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() {
//對圖形組件實例化
jf=new JFrame("任靜的計算器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
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 ?使計算器可以運行
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();
}
}
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
//?當點擊按鈕+、-、*、/時，com?=?true
boolean?com?=?false;
//?當i=0時說明是我們第一次輸入，字符串text不會累加
int?i?=?0;
//?存放text的內容
String?text?=?"";
//?存放點擊按鈕+、-、*、/之前的數值
double?defbutton?=?0;
//?+、-、*、/的代號分別為1，2，3，4
int?symbol?=?0;
//?構造函數
Jisuanqi()?{
super("WangJiao");?//?設定標題
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);?//?設定關閉窗體時退出程序
JPanel?pane?=?new?JPanel();?//?定義主面板
pane.setLayout(new?BorderLayout());
setBounds(380,?220,?30,?80);?//?前兩個參數是在屏幕上顯示的坐標，后兩個是大小
//?替換圖標
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1按鈕添加監(jiān)聽事件
number_key.two.addActionListener(this);?//?對2按鈕添加監(jiān)聽事件
number_key.three.addActionListener(this);?//?對3按鈕添加監(jiān)聽事件
number_key.four.addActionListener(this);?//?對4按鈕添加監(jiān)聽事件
number_key.five.addActionListener(this);?//?對5按鈕添加監(jiān)聽事件
number_key.six.addActionListener(this);?//?對6按鈕添加監(jiān)聽事件
number_key.seven.addActionListener(this);?//?對7按鈕添加監(jiān)聽事件
number_key.eight.addActionListener(this);?//?對8按鈕添加監(jiān)聽事件
number_key.nine.addActionListener(this);?//?對9按鈕添加監(jiān)聽事件
number_key.zero.addActionListener(this);?//?對0按鈕添加監(jiān)聽事件
number_key.ce.addActionListener(this);?//?對置零按鈕添加監(jiān)聽事件
number_key.plus.addActionListener(this);?//?對+按鈕添加監(jiān)聽事件
number_key.equal.addActionListener(this);?//?對=按鈕添加監(jiān)聽事件
number_key.sub.addActionListener(this);?//?對-按鈕添加監(jiān)聽事件
number_key.mul.addActionListener(this);?//?對*按鈕添加監(jiān)聽事件
number_key.div.addActionListener(this);?//?對/按鈕添加監(jiān)聽事件
number_key.point.addActionListener(this);?//?對.按鈕添加監(jiān)聽事件
setContentPane(pane);
pack();?//?初始化窗體大小為正好盛放所有按鈕
}
//?各個按鈕觸發(fā)的事件
public?void?actionPerformed(ActionEvent?e)?{
/*
?*?如果是點擊數字按鈕那么先要判斷是否在此之前點擊了+、-、*、/、=，如果是那么com=true?如果沒有com=
?*?false;或者是否點擊數字鍵，如果是i?=?1,如果沒有?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");
}
}
/*
?*?對于0這個按鈕有一定的說法，在我的程序里不會出現(xiàn)如00000這樣的情況，我加了判斷條件就是
?*?如果text中的數值=0就要判斷在這個數值中是否有.存在?如果有那么就在原來數值基礎之上添?加0;否則保持原來的數值不變
?*/
else?if?(e.getSource()?==?number_key.zero)?{?//?result.text.getText()是得到text里內容的意思
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)就是類型轉換了，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;
}
/*
?*?本程序不會讓一個數值中出現(xiàn)2個以上的小數點.具體做法是:判斷是否已經存在.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);
}
}
}?//?獲得點擊+之前的數值
else?if?(e.getSource()?==?number_key.plus)?{
com?=?true;
i?=?0;
defbutton?=?Double.parseDouble(result.text.getText());
symbol?=?1;
}?//?獲得點擊-之前的數值
else?if?(e.getSource()?==?number_key.sub)?{
com?=?true;
i?=?0;
defbutton?=?Double.parseDouble(result.text.getText());
symbol?=?2;
}?//?獲得點擊*之前的數值
else?if?(e.getSource()?==?number_key.mul)?{
com?=?true;
i?=?0;
defbutton?=?Double.parseDouble(result.text.getText());
System.out.println(defbutton);
symbol?=?3;
}?//?獲得點擊/之前的數值
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:?{?//?計算加法
double?ad?=?defbutton
+?Double.parseDouble(result.text.getText());
result.text.setText(ad?+?"");
i?=?0;
text?=?"";
break;
}
case?2:?{?//?計算減法
double?ad?=?defbutton
-?Double.parseDouble(result.text.getText());
result.text.setText(String.valueOf(ad));
i?=?0;
text?=?"";
break;
}
case?3:?{?//?計算乘法
double?ad?=?defbutton
*?Double.parseDouble(result.text.getText());
result.text.setText(ad?+?"");
i?=?0;
text?=?"";
break;
}
case?4:?{?//?計算除法
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();
}
}
//?計算器數字按鈕定義面板
class?Number_Key?extends?JPanel?{
/**
?*
?*/
private?static?final?long?serialVersionUID?=?1L;
JButton?zero?=?new?JButton("0");?//?數字鍵0
JButton?one?=?new?JButton("1");?//?數字鍵1
JButton?two?=?new?JButton("2");?//?數字鍵2
JButton?three?=?new?JButton("3");?//?數字鍵3
JButton?four?=?new?JButton("4");?//?數字鍵4
JButton?five?=?new?JButton("5");?//?數字鍵5
JButton?six?=?new?JButton("6");?//?數字鍵6
JButton?seven?=?new?JButton("7");?//?數字鍵7
JButton?eight?=?new?JButton("8");?//?數字鍵8
JButton?nine?=?new?JButton("9");?//?數字鍵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格布局
setBackground(Color.blue);?//?設置背景顏色
//?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);
}
}
//?計算器顯示結果的窗體
class?Result?extends?JPanel?{
/**
?*
?*/
private?static?final?long?serialVersionUID?=?1L;
//?text先是輸入和結果
JTextField?text?=?new?JTextField("0");
@SuppressWarnings("deprecation")
Result()?{?//?講輸入的數字或得到的結果在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
}
}
直接復制?保存成Jisuanqi?.java可以直接運行了
打開IED：打開自己java編程的軟件，采用的是eclipse軟件。
建立java工程。
編寫類。
編寫類的詳細步驟
1.類的基本結構：
由于這里用到了界面，所以要進行窗口界面的編程，按鈕事件的處理，和計算處理界面；
package MyCaculator;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class MyCaculator extends JFrame {
private int add=1,sub=2,mul=3,div=4;
private int op=0;
boolean ifOp;
private String output="0";
private Button[] jba=new Button[]{new Button("7"),new Button("8"),
new Button("9"),new Button("+"),
new Button("4"),new Button("5"),new Button("6"),new Button("-"),
new Button("1"),new Button("2"),new Button("3"),new Button("*"),
new Button("0"),new Button("."),new Button("="),new Button("/")};
private JPanel jpt=new JPanel();
private JPanel jpb=new JPanel();
private JTextField jtf=new JTextField("");
private MyCaculator(){
}
private void operate(String x){
}
public String add(String x){
return output;
}
public String subtract(String x){
return output;
}
public String multiply(String x){
return output;
}
public String divide(String x){
return output;
}
public String Equals(String x){
return output;
}
public void opClean(){
}
class setOperate_Act implements ActionListener{
public void actionPerformed(ActionEvent e) {
}
}
class setLabel_Act implements ActionListener{
public void actionPerformed(ActionEvent e) {
}
}
public static void main(String[] args) {
}
}
2.建立構造方法：
所謂構造方法就是，對自己的主類進行初始化，代碼如下：
private MyCaculator(){
jpt.setLayout(new BorderLayout());
jpt.add(jtf);
this.add(jpt,BorderLayout.NORTH);
jpb.setLayout(new GridLayout(4,4));
for(int i=0;ijba.length;i++){
jpb.add(jba[i]);
if(i==3||i==7||i==11||i==15||i==14)
jba[i].addActionListener(new setOperate_Act());
else
jba[i].addActionListener(new setLabel_Act());
}
this.add(jpb,BorderLayout.CENTER);
this.setSize(250, 200);
this.setResizable(false);
this.setVisible(true);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
3.建立數據計算方法
這里的數據計算方法有6個，一個是主方法其他幾個是加減乘除的處理方法，代碼如下：
private void operate(String x){
double x1=Double.valueOf(x);
double y=Double.valueOf(output);
switch(op){
case 0:output=x;break;
case 1:output=String.valueOf(y+x1);break;
case 2:output =String.valueOf(y-x1);break;
case 3:output =String.valueOf(y*x1);break;
case 4:
if(x1!=0) output=String.valueOf(y/x1);
else output="不能為0";
break;
}
}
public String add(String x){
operate(x);
op=add;
return output;
}
public String subtract(String x){
operate(x);
op=sub;
return output;
}
public String multiply(String x){
operate(x);
op=mul;
return output;
}
public String divide(String x){
operate(x);
op=div;
return output;
}
public String Equals(String x){
operate(x);
op=0;
return output;
}
public void opClean(){
op=0;
output ="0";
}
4.事件處理方法
這里的時間處理方法，沒有建立一個整體的方法，二是在為了便于處理的方法，將按鈕事件分成兩個部分，并采用兩個子類來實現(xiàn)，這兩個類時內部類要寫在主類內部的，代碼如下：
class setOperate_Act implements ActionListener{
public void actionPerformed(ActionEvent e) {
if(e.getSource()==jba[3]){
jtf.setText(add(jtf.getText()));
ifOp=true;
}
else if(e.getSource()==jba[7]){
jtf.setText(subtract(jtf.getText()));
ifOp=true;
}
else if(e.getSource()==jba[11]){
jtf.setText(multiply(jtf.getText()));
ifOp=true;
}
else if(e.getSource()==jba[15]){
jtf.setText(divide(jtf.getText()));
ifOp=true;
}
else if(e.getSource()==jba[14]){
jtf.setText(Equals(jtf.getText()));
ifOp=true;
}
}
}
class setLabel_Act implements ActionListener{
public void actionPerformed(ActionEvent e) {
Button tempb=(Button)e.getSource();
if(ifOp){
jtf.setText(tempb.getLabel());
ifOp=false;
}else {
jtf.setText(jtf.getText()+tempb.getLabel());
}
}
}
5.建立main方法：
要想實現(xiàn)我們的代碼，我們需在main方法中，實例化我們的對象。
public static void main(String[] args) {
new MyCaculator();
}
主要涉及的知識點: 類的寫法, 以及方法的調用 .建議多做練習. 如果有看不懂的地方. 可以繼續(xù)追問,一起討論.
參考代碼如下
//Number類
class?Number?{
private?int?n1;//私有的整型數據成員n1
private?int?n2;//私有的整型數據成員n2
//?通過構造函數給n1和n2賦值
public?Number(int?n1,?int?n2)?{
this.n1?=?n1;
this.n2?=?n2;
}
//?加法
public?int?addition()?{
return?n1?+?n2;
}
//?減法
public?int?subtration()?{
return?n1?-?n2;
}
//?乘法
public?int?multiplication()?{
return?n1?*?n2;
}
//?除法?(可能除不盡,所以使用double作為返回類型)
public?double?division()?{
return?n1?*?1.0?/?n2;?//?通過n1*1.0?把計算結果轉換成double類型.
}
}
//Exam4?類
public?class?Exam4{
public?static?void?main(String[]?args)?{
Number?number=new?Number(15,?6);//創(chuàng)建Number類的對象
//下面的是調用方法得到返回值進行輸出顯示
System.out.println("加法"+number.addition());
System.out.println("減法"+number.subtration());
System.out.println("乘法"+number.multiplication());
System.out.println("除法"+number.division());
}
}
界面漂亮堪比系統(tǒng)自帶計算器，功能完美加減乘除開平方等等全部具備，還有清零按鈕，小數點的使用，連加連乘功能完全參考系統(tǒng)官方計算器經過長期調試改進而成，馬上拷貝代碼拿去試試看吧，絕不后悔！
代碼如下：
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
public class Counter {
public static void main(String[] args) {
CounterFrame frame = new CounterFrame();
frame.show();
}
}
class CounterFrame extends JFrame {
public CounterFrame() {
JMenuBar menuBar = new JMenuBar();
JMenu menuFile = new JMenu();
JMenu menuFile1 = new JMenu();
JMenu menuFile2 = new JMenu();
JMenu menuFile3 = new JMenu();
JMenuItem menuFileExit = new JMenuItem();
menuFile.setText("文件");
menuFile1.setText("編輯");
menuFile2.setText("查看");
menuFile3.setText("幫助");
menuFileExit.setText("退出");
menuFileExit.addActionListener
(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
CounterFrame.this.windowClosed();
}
}
);
menuFile.add(menuFileExit);
menuBar.add(menuFile);
menuBar.add(menuFile1);
menuBar.add(menuFile2);
menuBar.add(menuFile3);
setTitle("計算器");
setJMenuBar(menuBar);
setSize(new Dimension(400, 280));
this.getContentPane().add(new Allpanel());
this.addWindowListener
(
new WindowAdapter() {
public void windowClosing(WindowEvent e) {
CounterFrame.this.windowClosed();
}
}
);
}
protected void windowClosed() {
System.exit(0);
}
}
class Tool {
public static Tool instance;
private JTextField field;
private Tool() {
this.field=new JTextField(30);
this.field.setHorizontalAlignment(JTextField.RIGHT);
}
public static Tool getinstance()
{
if(instance==null)
{
instance=new Tool();
}
return instance;
}
public JTextField getfield()
{
return (this.field);
}
}
class Allpanel extends JPanel {
public Allpanel() {
this.setLayout(new BorderLayout(0,7));
Northpanel np=new Northpanel();
Centerpanel cp=new Centerpanel();
this.add(np,BorderLayout.NORTH);
this.add(cp,BorderLayout.CENTER);
}
}
class Centercenter extends JPanel {
static Vector Vec=new Vector();
static Vector vc=new Vector();
static Vector vc1=new Vector();
static Vector vc2=new Vector();
static Vector vc3=new Vector();
static String begin="yes";
static double add;
static double jq;
static double cs;
static double cq;
static double dy;
static String jg;
static String what;
static double tool=0;
static String to="yes";
/**
* Method Centercenter
*
*
*/
public Centercenter() {
// TODO: Add your code here
final JTextField text=Tool.getinstance().getfield();
this.setLayout(new GridLayout(4,5,3,3));
String arg[] ={"7","8","9","/","sqrt","4","5","6","*","%","1","2","3","-","1/x","0","+/-",".","+","="};
for(int i=0;i20;i++)
{
final JButton b=new JButton(arg[i]);
//this.add(new JButton(arg[i]));
this.add(b);
if(i==0||i==1||i==2||i==5||i==6||i==7||i==10||i==11||i==12||i==15)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String mark=b.getText();
String ma=text.getText();
if(vc3.contains("v3"))
{
text.setText("0."+mark);
vc3.clear();
}
else if(vc.contains("a"))
{
if(vc2.contains("v2"))
{
text.setText("0."+mark);
vc.clear();
vc2.clear();
}
else
{
text.setText(mark);
vc.clear();
Vec.clear();
Vec.add(mark);
}
}
else
{
text.setText(ma.trim()+mark);
Vec.add(mark);
}
begin="no";
to="yes";
}
});
}
if(i==17)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String mar=b.getText();
String m=text.getText();
if("yes".equals(begin))
{
vc3.add("v3");
}
if(vc1.contains("v1"))
{
vc2.add("v2");
vc1.clear();
}
if(!Vec.contains(".")!vc.contains("a"))
{
text.setText(m.trim()+mar);
Vec.add(".");
}
}
});
}
if(i==18)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
add=Double.parseDouble(ma);
if(what==null)
{
tool=add;
what="add";
}
else
{
tool=tool+add;
text.setText(String.valueOf((tool)));
}
vc.add("a");
vc1.add("v1");
to="+";
}
});
}
if(i==13)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
jq=Double.parseDouble(ma);
if(what==null)
{
tool=jq;
what="jq";
}
else
{
tool=tool-jq;
text.setText(String.valueOf((tool)));
}
vc.add("a");
vc1.add("v1");
to="-";
}
});
}
if(i==3)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
cq=Double.parseDouble(ma);
if(what==null)
{
tool=cq;
what="cq";
}
else
{
tool=tool/cq;
text.setText(String.valueOf((tool)));
}
vc.add("a");
vc1.add("v1");
to="/";
}
});
}
if(i==4)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
cq=Double.parseDouble(ma);
text.setText(String.valueOf(Math.sqrt(cq)));
}
});
}
if(i==8)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
cs=Double.parseDouble(ma);
if(what==null)
{
tool=cs;
what="cs";
}
else
{
tool=tool*cs;
text.setText(String.valueOf((tool)));
}
vc.add("a");
vc1.add("v1");
to="*";
}
});
}
if(i==19)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
dy=Double.parseDouble(ma);
if(what=="add")
{
jg=String.valueOf((tool+dy));
}
if(what=="jq")
{
jg=String.valueOf((tool-dy));
}
if(what=="cs")
{
jg=String.valueOf((tool*dy));
}
if(what=="cq")
{
jg=String.valueOf((tool/dy));
}
if(what==null)
{
if(to=="+")
{
tool=add;
jg=String.valueOf(tool+dy);
}
else if(to=="-")
{
tool=jq;
jg=String.valueOf(dy-tool);
}
else if(to=="*")
{
tool=cs;
jg=String.valueOf(dy*tool);
}
else if(to=="/")
{
tool=cq;
jg=String.valueOf(dy/tool);
}
else
{
jg=String.valueOf(dy);
}
}
text.setText(jg);
Vec.clear();
Vec.add(".");
vc.add("a");
vc1.add("v1");
what=null;
tool=0;
}
});
}
}
}
}
class Centernorth extends JPanel {
public Centernorth() {
final JTextField text=Tool.getinstance().getfield();
JButton jb1=new JButton("Backspace");
JButton jb2=new JButton(" CE ");
JButton jb3=new JButton(" C ");
this.add(jb1);
this.add(jb2);
this.add(jb3);
jb1.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
String back=Tool.getinstance().getfield().getText();
text.setText(backmethod(back));
Centercenter.Vec.remove(Centercenter.Vec.size()-1);
}
});
jb3.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
text.setText("0.");
Centercenter.Vec.clear();
Centercenter.Vec.add(".");
Centercenter.vc.add("a");
Centercenter.begin="yes";
Centercenter.vc1.clear();
Centercenter.what=null;
Centercenter.tool=0;
}
});
}
public String backmethod(String str)
{
return str.substring(0,str.length()-1);
}
}
class Centerpanel extends JPanel {
public Centerpanel() {
this.setLayout(new BorderLayout(8,7));
Centernorth cn=new Centernorth();
Centercenter cc=new Centercenter();
Centerwest cw=new Centerwest();
this.add(cn,BorderLayout.NORTH);
this.add(cc,BorderLayout.CENTER);
this.add(cw,BorderLayout.WEST);
}
}
class Centerwest extends JPanel {
public Centerwest() {
this.setLayout(new GridLayout(4,1,3,3));
this.add(new JButton("MC"));
this.add(new JButton("MR"));
this.add(new JButton("MS"));
this.add(new JButton("M+"));
}
}
class Northpanel extends JPanel {
private JTextField tf;
public Northpanel() {
tf=Tool.getinstance().getfield();
this.add(tf);
}
}
---------------------------------------------------------------------------
=============《按你要求特意后改過的最簡單功能的代碼如下》========================
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
public class Counter2 {
public static void main(String[] args) {
CounterFrame frame = new CounterFrame();
frame.show();
}
}
class CounterFrame extends JFrame {
public CounterFrame() {
setTitle("計算器");
setSize(new Dimension(400, 280));
this.getContentPane().add(new Allpanel());
this.addWindowListener
(
new WindowAdapter() {
public void windowClosing(WindowEvent e) {
CounterFrame.this.windowClosed();
}
}
);
}
protected void windowClosed() {
System.exit(0);
}
}
class Tool {
public static Tool instance;
private JTextField field;
private Tool() {
this.field=new JTextField(30);
this.field.setHorizontalAlignment(JTextField.RIGHT);
}
public static Tool getinstance()
{
if(instance==null)
{
instance=new Tool();
}
return instance;
}
public JTextField getfield()
{
return (this.field);
}
}
class Allpanel extends JPanel {
public Allpanel() {
this.setLayout(new BorderLayout(0,7));
Northpanel np=new Northpanel();
Centerpanel cp=new Centerpanel();
this.add(np,BorderLayout.NORTH);
this.add(cp,BorderLayout.CENTER);
}
}
class Centercenter extends JPanel {
static Vector Vec=new Vector();
static Vector vc=new Vector();
static Vector vc1=new Vector();
static Vector vc2=new Vector();
static Vector vc3=new Vector();
static String begin="yes";
static double add;
static double jq;
static double cs;
static double cq;
static double dy;
static String jg;
static String what;
static double tool=0;
static String to="yes";
/**
* Method Centercenter
*
*
*/
public Centercenter() {
// TODO: Add your code here
final JTextField text=Tool.getinstance().getfield();
this.setLayout(new GridLayout(4,5,3,3));
String arg[] ={"7","8","9","/","4","5","6","*","1","2","3","-","0","=",".","+"};
for(int i=0;i16;i++)
{
final JButton b=new JButton(arg[i]);
//this.add(new JButton(arg[i]));
this.add(b);
if(i==0||i==1||i==2||i==4||i==5||i==6||i==8||i==9||i==10||i==12)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String mark=b.getText();
String ma=text.getText();
if(vc3.contains("v3"))
{
text.setText("0."+mark);
vc3.clear();
}
else if(vc.contains("a"))
{
if(vc2.contains("v2"))
{
text.setText("0."+mark);
vc.clear();
vc2.clear();
}
else
{
text.setText(mark);
vc.clear();
Vec.clear();
Vec.add(mark);
}
}
else
{
text.setText(ma.trim()+mark);
Vec.add(mark);
}
begin="no";
to="yes";
}
});
}
if(i==14)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String mar=b.getText();
String m=text.getText();
if("yes".equals(begin))
{
vc3.add("v3");
}
if(vc1.contains("v1"))
{
vc2.add("v2");
vc1.clear();
}
if(!Vec.contains(".")!vc.contains("a"))
{
text.setText(m.trim()+mar);
Vec.add(".");
}
}
});
}
if(i==15)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
add=Double.parseDouble(ma);
if(what==null)
{
tool=add;
what="add";
}
else
{
tool=tool+add;
text.setText(String.valueOf((tool)));
}
vc.add("a");
vc1.add("v1");
to="+";
}
});
}
if(i==11)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
jq=Double.parseDouble(ma);
if(what==null)
{
tool=jq;
what="jq";
}
else
{
tool=tool-jq;
text.setText(String.valueOf((tool)));
}
vc.add("a");
vc1.add("v1");
to="-";
}
});
}
if(i==3)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
cq=Double.parseDouble(ma);
if(what==null)
{
tool=cq;
what="cq";
}
else
{
tool=tool/cq;
text.setText(String.valueOf((tool)));
}
vc.add("a");
vc1.add("v1");
to="/";
}
});
}
if(i==7)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
cs=Double.parseDouble(ma);
if(what==null)
{
tool=cs;
what="cs";
}
else
{
tool=tool*cs;
text.setText(String.valueOf((tool)));
}
vc.add("a");
vc1.add("v1");
to="*";
}
});
}
if(i==13)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
dy=Double.parseDouble(ma);
if(what=="add")
{
jg=String.valueOf((tool+dy));
}
if(what=="jq")
{
jg=String.valueOf((tool-dy));
}
if(what=="cs")
{
jg=String.valueOf((tool*dy));
}
if(what=="cq")
{
jg=String.valueOf((tool/dy));
}
if(what==null)
{
if(to=="+")
{
tool=add;
jg=String.valueOf(tool+dy);
}
else if(to=="-")
{
tool=jq;
jg=String.valueOf(dy-tool);
}
else if(to=="*")
{
tool=cs;
jg=String.valueOf(dy*tool);
}
else if(to=="/")
{
tool=cq;
jg=String.valueOf(dy/tool);
}
else
{
jg=String.valueOf(dy);
}
}
text.setText(jg);
Vec.clear();
Vec.add(".");
vc.add("a");
vc1.add("v1");
what=null;
tool=0;
}
});
}
}
}
}
class Centernorth extends JPanel {
public Centernorth() {
final JTextField text=Tool.getinstance().getfield();
}
}
class Centerpanel extends JPanel {
public Centerpanel() {
this.setLayout(new BorderLayout(8,7));
Centernorth cn=new Centernorth();
Centercenter cc=new Centercenter();
Centerwest cw=new Centerwest();
this.add(cn,BorderLayout.NORTH);
this.add(cc,BorderLayout.CENTER);
this.add(cw,BorderLayout.WEST);
}
}
class Centerwest extends JPanel {
public Centerwest() {
}
}
class Northpanel extends JPanel {
private JTextField tf;
public Northpanel() {
tf=Tool.getinstance().getfield();
this.add(tf);
}
}
------------------------------------------------------------
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