[求助]新手求一 计算器原代码

Question

高手帮忙指点下新人哈!

Answer 1

没有了   楼上的大哥
这会才弄那些,离挂也就一层纸了我是最近想想学习点东西才想弄来看的我自己已经用AWT做了界面   可是   event   没看明白就想学习前辈的经验而已

Answer 2

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.lang.Math;public class Jisuanqi extends JFrame implements ActionListener  {

private JButton[]  btn1,btn2;
private JTextField text;
private JButton bq=new JButton("Çå¿Õ");
private JButton bd=new JButton("=");
private JButton square=new JButton("ƽ·½");
private JButton kaifang=new JButton("¿ª·½");
private JButton sin=new JButton("sin");
private JButton cos=new JButton("cos");
private JMenuBar mbar=new JMenuBar();
private JMenu menu1,menu2;
private JMenuItem mitem1,mitem2;
//private BorderLayout boder =new  BoderLayout();
private GridLayout grid=new GridLayout(4,4);
private JPanel panel;
Container cp;
int a1=10,a2=4;
String str=new String();
String str1=new String();
String str2=new String();
String str3=new String();
int i,j,c;
boolean flag=true;
double c1,c2,r;     public Jisuanqi(){
        
      btn1=new JButton[10];
      for(i=0;i<a1;i++){
      btn1[i]=new JButton(str.valueOf(i));
     
      }
      //mbar=new JMenuBar();
      setJMenuBar(mbar);
      menu1=new JMenu("HELP");
     
      menu2=new JMenu("exit");
      mbar.add(menu1);
      mbar.add(menu2);
      mitem1=new JMenuItem("Writer");
      mitem2=new JMenuItem("Introduction");
      menu1.add(mitem1);
      menu1.addSeparator();
      menu1.add(mitem2);
     
     
      btn2=new JButton[4];
      btn2[0]=new JButton("+");
      btn2[1]=new JButton("-");
      btn2[2]=new JButton("*");
      btn2[3]=new JButton("/");
     
      text=new JTextField("0",10);
      cp=getContentPane();
        cp.add(text,"North");
      panel=new JPanel();
      panel=new JPanel(grid);
      for(i=0;i<a1;i++){
        panel.add(btn1[i]);
        btn1[i].addActionListener(this);
        
      }
      for(j=0;j<4;j++){
      panel.add(btn2[j]);
     btn2[j].addActionListener(new operator());
      }
      panel.add(bq);
      panel.add(bd);
      panel.add(square);
      panel.add(kaifang);
      panel.add(sin);
      panel.add(cos);
     
      //cp.add(panel1,"North");
      cp.add(panel,"South");
      bq.addActionListener(this);
      bd.addActionListener(this);
     }
     public void actionPerformed(ActionEvent e1){
     
     
      for(i=0;i<a1;i++)
      {   
      if(e1.getSource()==btn1[i]){
      if(flag){
          str=str.valueOf(i);
          
          str1+=str;
          text.setText(str1);
          c1=Double.parseDouble(str1);
             }
          else {
     
      str=str.valueOf(i);
      str2+=str;
          text.setText(str2);
      c2=Double.parseDouble(str2);
           }
      }  
      if(e1.getSource()==kaifang){
      double d=Double.parseDouble(text.getText());
      // d=d*d;
      text.setText(String.valueOf(Math.sqrt(d)));
     
      }
      if(e1.getSource()==bq)
      { text.setText(""); 
        str1=str=str2=""; 
        flag=true; 
        //str1="0";
       // text.setText(str1);
       // c1=0;
        } 
        }
        
        
        if(e1.getSource()==bd){
            r=0;
         switch(c){
         case 0: r=c1+c2;text.setText(str3.valueOf(r));str1=str3.valueOf(r);break;
         case 1: r=c1-c2;text.setText(str3.valueOf(r));str1=str3.valueOf(r);break;
         case 2: r=c1*c2;text.setText(str3.valueOf(r));str1=str3.valueOf(r);break;
         case 3: r=c1/c2;text.setText(str3.valueOf(r));str1=str3.valueOf(r);break;
         };
          //str1=str3;
            c1=Double.parseDouble(str1);
            str2=str3="";
        
        }
     }
     
     class operator implements ActionListener{
     public void actionPerformed(ActionEvent e2){
      for(j=0;j<a2;j++)
      {if(e2.getSource()==btn2[j])
        {c=j;flag=false;}
        }
        
     }
  }
     public static void  main(String[] args){
      Jisuanqi jj=new Jisuanqi();
      jj.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      jj.setSize(200,200);
      jj.pack();
      jj.setVisible(true);
      jj.setTitle("&frac14;&AElig;&Euml;&atilde;&AElig;÷");
      jj.setResizable(false);
     }
 
}刚学java那会写得有好多漏洞 凑或看吧

Answer 3

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;import javax.swing.*;public class Calculator extends JFrame implements ActionListener{
 public static final int WIDTH = 800;            
     public static final int HEIGHT = 600;           
     public static final int BUTTON_WIDTH = 80;      
     public static final int BUTTON_HEIGHT = 60;          private CardLayout dealer;                      
     private JPanel     deckPanel;                        private JTextField result;                           private double head = 0.0;                      
     private double tail = 0.0;                           private boolean substitution = true;                 private String operatedCommand = "NOTHING";     
     private String preOperatedCommand = "NOTHING";       public Calculator(){
         setSize(WIDTH, HEIGHT);
         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         setTitle("Calculator");         Container contentPre = getContentPane();             dealer = new CardLayout();                  
         deckPanel = new JPanel();
         deckPanel.setLayout(dealer);         Box content = Box.createVerticalBox();               Box registration = Box.createVerticalBox();         JMenu fileMenu = new JMenu("File");
         JMenuItem exitItemOfFile = new JMenuItem("Exit");
         exitItemOfFile.addActionListener(this);
         fileMenu.add(exitItemOfFile);
         JMenuBar jMenuBar = new JMenuBar();
         jMenuBar.add(fileMenu);
         setJMenuBar(jMenuBar);         result = new JTextField("0.0");                     
         result.setBackground(Color.CYAN);                 
         result.setHorizontalAlignment(JTextField.RIGHT);           content.add(result);         content.add(paintButtons());         deckPanel.add("cal", content);                             deckPanel.add("reg", registration);                        contentPre.add(deckPanel);                   
     }
     public Box paintButtons(){
         Box vPanel1 = Box.createVerticalBox();         // add the seven button
         JButton seven = new JButton("7");
         seven.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
         seven.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
         seven.addActionListener(this);
         vPanel1.add(seven);         // add the four button
         JButton four = new JButton("4");
         four.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
         four.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
         four.addActionListener(this);
         vPanel1.add(four);         // add the one button
         JButton one = new JButton("1");
         one.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
         one.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
         one.addActionListener(this);
         vPanel1.add(one);         // add the zero button
         JButton zero = new JButton("0");
         zero.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
         zero.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
         zero.addActionListener(this);
         vPanel1.add(zero);         Box vPanel2 = Box.createVerticalBox();          // add the eight button
         JButton eight = new JButton("8");
         eight.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
         eight.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
         eight.addActionListener(this);
         vPanel2.add(eight);         // add the five button
         JButton five = new JButton("5");
         five.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
         five.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
         five.addActionListener(this);
         vPanel2.add(five);         // add the two button
         JButton two = new JButton("2");
         two.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
         two.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
         two.addActionListener(this);
         vPanel2.add(two);         // add the dot button
         JButton dot = new JButton(".");
         dot.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
         dot.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
         dot.addActionListener(this);
         vPanel2.add(dot);         Box vPanel3 = Box.createVerticalBox();         // add the nine button
         JButton nine = new JButton("9");
         nine.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
         nine.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
         nine.addActionListener(this);
         vPanel3.add(nine);         // add the six button
         JButton six = new JButton("6");
         six.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
         six.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
         six.addActionListener(this);
         vPanel3.add(six);         // add the three button
         JButton three = new JButton("3");
         three.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
         three.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
         three.addActionListener(this);
         vPanel3.add(three);         // add the plusMinus button
         JButton plusMinus = new JButton("\u00b1");
         plusMinus.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
         plusMinus.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
         plusMinus.addActionListener(this);
         vPanel3.add(plusMinus);

Answer 4

         Box vPanel4 = Box.createVerticalBox();         // add the division button
         JButton division = new JButton("\u00F7");
         division.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
         division.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
         division.addActionListener(this);
         vPanel4.add(division);         // add the multiplication button
         JButton multiplication = new JButton("\u00d7");
         multiplication.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
         multiplication.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
         multiplication.addActionListener(this);
         vPanel4.add(multiplication);         // add the subtract button
         JButton subtract = new JButton("-");
         subtract.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
         subtract.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
         subtract.addActionListener(this);
         vPanel4.add(subtract);         // add the plus button
         JButton plus = new JButton("+");
         plus.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
         plus.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
         plus.addActionListener(this);
         vPanel4.add(plus);         Box vPanel5 = Box.createVerticalBox();         // add the C button
         JButton c = new JButton("C");
         c.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
         c.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT));
         c.addActionListener(this);
         vPanel5.add(c);         // add a vertical strut
         Component verticalStrut = Box.createVerticalStrut(BUTTON_HEIGHT);
         vPanel5.add(verticalStrut);         // add the enter button
         JButton enter = new JButton("=");
         enter.setMaximumSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT * 2));
         enter.setPreferredSize(new Dimension(BUTTON_WIDTH, BUTTON_HEIGHT * 2));
         enter.addActionListener(this);
         vPanel5.add(enter);         Box buttonsPanel = Box.createHorizontalBox();
         
         buttonsPanel.add(vPanel1);
         buttonsPanel.add(vPanel2);
         buttonsPanel.add(vPanel3);
         buttonsPanel.add(vPanel4);
         buttonsPanel.add(vPanel5);         return buttonsPanel;
     }
     public void actionPerformed(ActionEvent e)
     {
         String actionCommand = e.getActionCommand();         // exit the system
         if(actionCommand.equals("Exit"))
             System.exit(0);         // post the result
         else if(actionCommand.equals("="))
         {
             // if the pre-operated command was "=", return the pre-step
             if(!preOperatedCommand.equals("="))
                 tail = Double.parseDouble(result.getText().trim());             // if the two numbel are 0, we don't need calculate the result
             if(tail!= 0.0 || head !=0.0)
             {
                 // division
                 if(operatedCommand.equals("\u00F7"))
                 {
                     if(Math.abs(tail) > 0.0000000000000000001)
                     {
                         head = head/tail;
                         result.setText(Double.toString(head));
                     }
                     else
                     {
                         JOptionPane.showMessageDialog(this, "Cannot divide by zero.");
                         head = 0.0;
                         tail = 0.0;
                     }
                     substitution = true;
                 }
                                // multiplacation
                 else if(operatedCommand.equals("\u00d7"))
                 {
                     head = head*tail;
                     result.setText(Double.toString(head));
                     substitution = true;
                 }
                                // sub
                 else if(operatedCommand.equals("-"))
                 {
                     head = head-tail;
                     result.setText(Double.toString(head));
                     substitution = true;
                 }
                                // plus
                 else if(operatedCommand.equals("+"))
                {
                     head = head+tail;
                     result.setText(Double.toString(head));
                     substitution = true;
                 }
                 
             }
             preOperatedCommand = "=";
         }
        else if(actionCommand.equals("0"))
        {
            if(!(result.getText().equals("0") || result.getText().equals("-0")))
            {
                if(substitution)
                {
                    result.setText("0");
                }
                else
                    result.setText(result.getText() + "0");
            }
        }
        else if(actionCommand.equals("1"))
        {
            if(substitution)
            {
                result.setText("1");
                substitution = false;
            }
            else
                result.setText(result.getText() + "1");
        }
        else if(actionCommand.equals("2"))
        {
            if(substitution)
            {
                result.setText("2");
                substitution = false;
            }
            else
                result.setText(result.getText() + "2");
        }

Answer 5

else if(actionCommand.equals("3"))
        {
            if(substitution)
            {
                result.setText("3");
                substitution = false;
            }
            else
                result.setText(result.getText() + "3");
        }
        else if(actionCommand.equals("4"))
        {
            if(substitution)
            {
                result.setText("4");
                substitution = false;
            }
            else
                result.setText(result.getText() + "4");
        }
        else if(actionCommand.equals("5"))
        {
            if(substitution)
            {
                result.setText("5");
                substitution = false;
            }
            else
                result.setText(result.getText() + "5");
        }
        else if(actionCommand.equals("6"))
        {
            if(substitution)
            {
                result.setText("6");
                substitution = false;
            }
            else
                result.setText(result.getText() + "6");
        }
        else if(actionCommand.equals("7"))
        {
            if(substitution)
            {
                result.setText("7");
                substitution = false;
            }
            else
                result.setText(result.getText() + "7");
        }
         else if(actionCommand.equals("8"))
         {
            if(substitution)
            {
                result.setText("8");
                substitution = false;
            }
            else
                result.setText(result.getText() + "8");
        }
         else if(actionCommand.equals("9"))
         {
            if(substitution)
            {
                result.setText("9");
                substitution = false;
            }
            else
                result.setText(result.getText() + "9");
        }
        else if(actionCommand.equals("."))
        {
            if(result.getText().length() == 0)
                result.setText("0.");        }
        else if(actionCommand.equals("\u00b1"))
        {
            if(result.getText().charAt(0) != '-')
                result.setText("-" + result.getText());
            else
                result.setText(result.getText().substring(1));
        }
        else if(actionCommand.equals("C"))
        {
            result.setText("0");
            substitution = true;
        }
         // division
         else if(actionCommand.equals("\u00F7"))
         {
             head = Double.parseDouble(result.getText().trim());
             operatedCommand = "\u00F7";
             substitution = true;
             preOperatedCommand = "\u00F7";
         }
         // multiplication
         else if(actionCommand.equals("\u00d7"))
         {
             head = Double.parseDouble(result.getText().trim());
             operatedCommand = "\u00d7";
             substitution = true;
             preOperatedCommand = "\u00d7";
         }
                // sub
         else if(actionCommand.equals("-"))
         {
             head = Double.parseDouble(result.getText().trim());
             operatedCommand = "-";
             substitution = true;
             preOperatedCommand = "-";
         }
                // plus
         else if(actionCommand.equals("+"))
         {
             head = Double.parseDouble(result.getText().trim());
             operatedCommand = "+";
             substitution = true;
             preOperatedCommand = "+";
         }
              }
     public double factorial(double value)
     {
         if(value <= 1.0)
             return value;
         else
             return value*factorial(value-1);
     }
     public long calChecksum(String message)
     {
         long check=0;         for (int i=0;i<message.length();i++)
                  check += message.charAt(i);
          return check;
     }
     public static void main(String[] args)
     {
         Calculator calculator = new Calculator();
         calculator.pack();
         calculator.setVisible(true);
     } }
//三段代码合起来就可以了，一个简单的计算器