计算器(原创)

 

import java.awt.*; 
import java.util.ArrayList; 
import java.util.Iterator; 
import java.lang.Double; 
import java.text.*; 
import java.awt.event.*; 
import javax.swing.*; 
public class CalculatorFrame extends Frame implements ActionListener 
{ 
private TextField text;//text_input; 
public boolean firstWrite = true; 
public boolean firstCalculate = true; 
public JPanel   cPanel1, cPanel2, cPanel3, cPanel4; 
private Button button_0,button_1,button_2,button_3,button_4,button_5,button_6,button_7,button_8, 
button_9,button_jia,button_jian,button_cheng,button_chu,button_cancel,button_deng; 
public CalculatorFrame() 
{ 
   JFrame jf = new JFrame("简易计算器"); 
   //super("简易计算器"); 
   cPanel1 = new JPanel(); 
   cPanel2 = new JPanel(new GridLayout(3,3)); 
   cPanel3 = new JPanel(new GridLayout(1,3)); 
   cPanel4 = new JPanel(new GridLayout(4,1)); 

   //this.setLayout(new GridLayout(1,1)); 

   text=new TextField(30); 
   text.setEditable(false); 
   text.setBackground (Color.white); 
   cPanel1.add(text); 
   //this.add(text_input); 
   //this.setLayout(new GridLayout(4,4)); 
   button_0=new Button("0"); 
   button_0.setBackground ( Color.getColor ("#000ffff") ); 
   button_1=new Button("1"); 
   button_2=new Button("2"); 
   button_3=new Button("3"); 
   button_4=new Button("4"); 
   button_5=new Button("5"); 
   button_6=new Button("6"); 
   button_7=new Button("7"); 
   button_8=new Button("8"); 
   button_9=new Button("9"); 
   button_jia=new Button("+"); 
   button_jian=new Button("-"); 
   button_cheng=new Button("*"); 
   button_chu=new Button("/"); 
   button_cancel=new Button("c"); 
   button_deng=new Button("="); 
   cPanel3.add(button_0); 
   cPanel2.add(button_1); 
   cPanel2.add(button_2); 
   cPanel2.add(button_3); 
   cPanel2.add(button_4); 
   cPanel2.add(button_5); 
   cPanel2.add(button_6); 
   cPanel2.add(button_7); 
     cPanel2.add(button_8); 
     cPanel2.add(button_9); 
     cPanel4.add(button_jia); 
     cPanel4.add(button_jian); 
     cPanel4.add(button_cheng); 
     cPanel4.add(button_chu); 
     cPanel3.add(button_cancel); 
     cPanel3.add(button_deng); 

     button_0.addActionListener(this); 
     button_1.addActionListener(this); 
     button_2.addActionListener(this); 
     button_3.addActionListener(this); 
     button_4.addActionListener(this); 
     button_5.addActionListener(this); 
     button_6.addActionListener(this); 
     button_7.addActionListener(this); 
     button_8.addActionListener(this); 
     button_9.addActionListener(this); 
     button_jia.addActionListener(this); 
     button_jian.addActionListener(this); 
     button_cheng.addActionListener(this); 
     button_chu.addActionListener(this); 
     button_cancel.addActionListener(this); 
     button_deng.addActionListener(this); 


     jf.addWindowListener(new WinClose()); 
     jf.getContentPane ().add (cPanel1, "North"); 
     jf.getContentPane ().add (cPanel2, "Center"); 
     jf.getContentPane ().add (cPanel3, "South"); 
     jf.getContentPane ().add (cPanel4, "East"); 
     cPanel1.setSize (20,40); 
     cPanel2.setSize (210,210); 
     cPanel3.setSize (70,280); 
     cPanel4.setSize (210,70); 
     jf.setSize (400,400); 
     jf.setLocation (300,300); 
     jf.setVisible (true); 
     } 
   public void result(ActionEvent e) 
   { 
     int cheng = 0; 
     int chu = 0; 
     int jia = 0; 
     int jian = 0; 
     double result=0.0; 
     String showResult = null; 
     /*---- 
     boolean one = true; 
     int whichSymbol = 1; 
     int m = saveCommand.size(); 
     for(int i= 0;i < m;i++) 
     { 
       switch(saveCommand.get(i)) 
       { 
       case '0':if(one)numFir=0;else numSec[I]=0; break; 
       case '1':if(one)numFir[I]=1;else numSec[I]=1; break; 
       case '2':if(one)numFir[I]=2;else numSec[I]=2; break; 
       case '3':if(one)numFir[I]=3;else numSec[I]=3; break; 
       case '4':if(one)numFir[I]=4;else numSec[I]=4; break; 
       case '5':if(one)numFir[I]=5;else numSec[I]=5; break; 
       case '6':if(one)numFir[I]=6;else numSec[I]=6; break; 
       case '7':if(one)numFir[I]=7;else numSec[I]=7; break; 
       case '8':if(one)numFir[I]=8;else numSec[I]=8; break; 
       case '9':if(one)numFir[I]=9;else numSec[I]=9; break; 
       case '*':whichSymbol=4; break; 
       case '/':whichSymbol=3; break; 
       case '+':whichSymbol=2; break; 
       case '-':whichSymbol=1; break; 
       default :break; 
       } 
     } 
   ---*/ 
   String commandArray = text.getText(); 
   cheng = commandArray.indexOf('*'); 
   chu = commandArray.indexOf('/'); 
     jia = commandArray.indexOf('+'); 
   jian = commandArray.indexOf('-'); 
   if(0<cheng && cheng<8) 
   { 
   double firNum = Double.parseDouble(commandArray.substring(0,cheng)); 
   double sndNum = Double.parseDouble(commandArray.substring(cheng+1)); 
   result = firNum * sndNum; 
   showResult = String.valueOf(result); 
   if(showResult.length()>6) 
     showResult.substring(0,6); 


   } 
   if(0<chu && chu<8) 
   { 
   double firNum = Double.parseDouble(commandArray.substring(0,chu)); 
   double sndNum = Double.parseDouble(commandArray.substring(chu+1)); 
   result = firNum / sndNum; 
   //result = Math.round(result); 
   DecimalFormat decimal = new DecimalFormat("#.######"); 
   //String piStr = decimal.format(pi); 
     //showResult = String.valueOf(result); 
   showResult = decimal.format(result); 
   } 
   if(0<jia && jia<8) 
   { 
   double firNum = Double.parseDouble(commandArray.substring(0,jia)); 
   double sndNum = Double.parseDouble(commandArray.substring(jia+1)); 
   result = firNum + sndNum; 
   showResult = String.valueOf(result); 
   if(showResult.length()>6) 
     showResult.substring(0,6); 
   } 
   if(0<jian && jian<8) 
   { 
   double firNum = Double.parseDouble(commandArray.substring(0,jian)); 
   double sndNum = Double.parseDouble(commandArray.substring(jian+1)); 
   result = firNum - sndNum; 
   showResult = String.valueOf(result); 
   if(showResult.length()>6) 
     showResult.substring(0,6); 
   } 
   //if(Math.abs(result)>0.0000001&&Math.abs(result)<10000000) 
   //{ 
   firstCalculate = true; 
   firstWrite = true; 
   text.setText(""+showResult); 
   //} 
     //else 
     //{ 
       //firstWrite = false; 
       //text.setText("Error"); 
     //} 
   } 
   public void actionPerformed(ActionEvent e) 
   { 
   int i=0; 
     ArrayList saveCommand=new ArrayList(); 
     if(e.getSource()==button_cancel) 
       text.setText(""); 

     if(e.getSource() == button_deng) 
     { 
     this.result(e); 
     } 
     if(e.getSource() == button_0) 
     { 
     //saveCommand.add("0"); 
     if(firstWrite) 
     { 
       text.setText(""+e.getActionCommand()); 
       firstWrite = false; 
     } 
     else 
       text.setText(text.getText()+e.getActionCommand()); 
     } 
     if(e.getSource() == button_1) 
     { 
     //saveCommand.add("1"); 
     if(firstWrite) 
     { 
       text.setText(""+e.getActionCommand()); 
       firstWrite = false; 
     } 
     else 
       text.setText(text.getText()+e.getActionCommand()); 
     } 
     if(e.getSource() == button_2) 
     { 
     //saveCommand.add("2"); 
     if(firstWrite) 
     { 
       text.setText(""+e.getActionCommand()); 
       firstWrite = false; 
     } 
     else 
       text.setText(text.getText()+e.getActionCommand()); 
     } 
     if(e.getSource() == button_3) 
     { 
     //saveCommand.add("3"); 
     if(firstWrite) 
     { 
       text.setText(""+e.getActionCommand()); 
       firstWrite = false; 
     } 
     else 
       text.setText(text.getText()+e.getActionCommand()); 
     } 
     if(e.getSource() == button_4) 
     { 
     //saveCommand.add("4"); 
     if(firstWrite) 
     { 
       text.setText(""+e.getActionCommand()); 
       firstWrite = false; 
     } 
     else 
       text.setText(text.getText()+e.getActionCommand()); 
     } 
     if(e.getSource() == button_5) 
     { 
     //saveCommand.add("5"); 
     if(firstWrite) 
     { 
       text.setText(""+e.getActionCommand()); 
       firstWrite = false; 
     } 
     else 
       text.setText(text.getText()+e.getActionCommand()); 
     } 
     if(e.getSource() == button_6) 
     { 
     //saveCommand.add("6"); 
     if(firstWrite) 
     { 
       text.setText(""+e.getActionCommand()); 
       firstWrite = false; 
     } 
     else 
       text.setText(text.getText()+e.getActionCommand()); 
     } 
     if(e.getSource() == button_7) 
     { 
     //saveCommand.add("7"); 
     if(firstWrite) 
     { 
       firstWrite = false; 
       text.setText(""+e.getActionCommand()); 
     } 
     else 
       text.setText(text.getText()+e.getActionCommand()); 
     } 
     if(e.getSource() == button_8) 
     { 
     //saveCommand.add("8"); 
     if(firstWrite) 
     { 
       firstWrite = false; 
       text.setText(""+e.getActionCommand()); 
     } 
     else 
       text.setText(text.getText()+e.getActionCommand()); 
     } 
     if(e.getSource() == button_9) 
     { 
     //saveCommand.add("9"); 
     if(firstWrite) 
     { 
       firstWrite = false; 
       text.setText(""+e.getActionCommand()); 
     } 
     else 
       text.setText(text.getText()+e.getActionCommand()); 
     } 
     if(e.getSource() == button_jia) 
     { 
     //saveCommand.add("+"); 
   if(firstCalculate) 
   { 
   text.setText(text.getText()+e.getActionCommand()); 

   } 
   else 
   { 
   this.result (e); 
   text.setText(text.getText()+e.getActionCommand()); 
   } 
   firstWrite = false; 
   firstCalculate = false; 
     } 
     if(e.getSource() == button_jian) 
     { 
     //saveCommand.add("-"); 
   if(firstCalculate) 
   { 
   text.setText(text.getText()+e.getActionCommand()); 
   } 
   else 
   { 
   this.result (e); 
   text.setText(text.getText()+e.getActionCommand()); 
   } 
   firstWrite = false; 
   firstCalculate = false; 
     } 
     if(e.getSource() == button_cheng) 
     { 
     //saveCommand.add("*"); 
   if(firstCalculate) 
   { 
   text.setText(text.getText()+e.getActionCommand()); 
   } 
   else 
   { 
   this.result (e); 
   text.setText(text.getText()+e.getActionCommand()); 
   } 
   firstWrite = false; 
   firstCalculate = false; 
     } 
     if(e.getSource() == button_chu) 
     { 
     //saveCommand.add("/"); 
   if(firstCalculate) 
   { 
   text.setText(text.getText()+e.getActionCommand()); 

   } 
   else 
   { 
   this.result (e); 
   text.setText(text.getText()+e.getActionCommand()); 
   } 
   firstWrite = false; 
   firstCalculate = false; 
     } 

   } 
   public static void main(String arg[]) 
   { 
   new CalculatorFrame(); 
   } 

class WinClose implements WindowListener 
{ 
     public void windowClosing(WindowEvent e) 
     { 
       System.exit(0); 
     } 
   public void windowOpened(WindowEvent e){} 
   public void windowActivated(WindowEvent e){} 
   public void windowDeactivated(WindowEvent e){} 
   public void windowClosed(WindowEvent e){} 
   public void windowIconified(WindowEvent e){} 
   public void windowDeiconified(WindowEvent e){} 
   } 
   };