calculator1.java

这是用java实现的一个简单的计算器程序

       catch (Exception ee){
                     System.out.println("There is a wrong");
                     text.setText("There is a wrong");
                     clear = false;
              }
           if (temp == Back){//˸
                     String s = text.getText();
                     text.setText("");
                     for (int i = 0; i < s.length() - 1; i++){
                            char a = s.charAt(i);
                            text.setText(text.getText() + a);
                     }
              }
           if (temp == ce){
                     text.setText("0.");
                     clear = true;
                     first = 1;
              }
              if (temp == c){
                     text.setText("0."); ;
                     clear = true;
                     first = 1;
              }
              if (temp == num0){
                     if (clear == false)//жǷ˷λ
                            text.setText("");
                     text.setText(text.getText() + "0");
              }
              if (temp == num1){
                     if (clear == false)
                            text.setText("");
                     text.setText(text.getText() + "1");
                     clear = true;//ǰ
              }
              if (temp == num2){
                     if (clear == false)
                            text.setText("");
                     text.setText(text.getText() + "2");
                     clear = true;
              }
              if (temp == num3){
                     if (clear == false)
                            text.setText("");
                     text.setText(text.getText() + "3");
                     clear = true;
              }
              if (temp == num4){
                     if (clear == false)
                            text.setText("");
                     text.setText(text.getText() + "4");
                     clear = true;
              }
              if (temp == num5){
                     if (clear == false)
                            text.setText("");
                     text.setText(text.getText() + "5");
                     clear = true;
              }
              if (temp == num6){
                     if (clear == false)
                            text.setText("");
                     text.setText(text.getText() + "6");
                     clear = true;
              }
              if (temp == num7){
                     if (clear == false)
                            text.setText("");
                     text.setText(text.getText() + "7");
                     clear = true;
              }
              if (temp == num8){
                     if (clear == false)
                            text.setText("");
                     text.setText(text.getText() + "8");
                     clear = true;
              }
              if (temp == num9){
                     if (clear == false)
                            text.setText("");
                     text.setText(text.getText() + "9");
                     clear = true;
              }
              if (temp == a)
                     text.setText(text.getText() + "A");
              if (temp == b)
                     text.setText(text.getText() + "B");
              if (temp == cc)
                     text.setText(text.getText() + "C");
              if (temp == dd)
                     text.setText(text.getText() + "D");
              if (temp == ee)
                     text.setText(text.getText() + "E");
              if (temp == ff)
                     text.setText(text.getText() + "F");
              if (temp == dian){
              clickable = true;
              for (int i = 0; i < text.getText().length(); i++)
                     if ('.' == text.getText().charAt(i))  {
                            clickable = false;
                            break;
                     } 
              if (clickable == true)//ڶ̳ж
                     text.setText(text.getText() + ".");
              }
              try{
                     if (temp == jia){//ӷ
                            qian = Double.parseDouble(text.getText());
                            fuhao = "+";
                            clear = false;
                     }
                     if (temp == jian){
                            qian = Double.parseDouble(text.getText());
                            fuhao = "-";
                            clear = false;
                            //;
                     }
                     if (temp == cheng){
                            qian = Double.parseDouble(text.getText());
                            fuhao = "*";
                            clear = false;
                     }
                     if (temp == chu){
                            qian = Double.parseDouble(text.getText());
                            fuhao = "/";
                            clear = false;
                     }
                     if (temp == deng){
                            double ss = Double.parseDouble(text.getText());
                            text.setText("");
                            if (fuhao == "+")
                                   text.setText(qian + ss + "");
                            if (fuhao == "-")
                                   text.setText(qian - ss + "");
                            if (fuhao == "*")
                                   text.setText(qian * ss + "");
                            if (fuhao == "/")
                                   text.setText(qian / ss + "");
                            clear = false;//Ҫǰһε
                            //;
                     }
                     if (temp == kai){
                            String s = text.getText();
                            if (s.charAt(0) == '-')
                                   text.setText("ܿ");
                            else
                                   text.setText(Double.toString(java.lang.Math.sqrt(Double.parseDouble(text.getText
 ()))));
                            clear = false;
                     }
                     if (temp == dao){
                            if (text.getText().charAt(0) == '0' && text.getText().length() == 1)
                                   text.setText("Ϊ");
                            else{
                                   boolean isDec = true;
                                   int i, j, k;
                                   String s = Double.toString(1 / Double.parseDouble(text.getText()));
                                   for (i = 0; i < s.length(); i++)
                                          if (s.charAt(i) == '.')
                                                 break;
                                   for (j = i + 1; j < s.length(); j++)
                                          if (s.charAt(j) != '0'){
                                                 isDec = false;
                                                 break;
                                          }
                                   if (isDec == true){
                                          String stemp = "";
                                          for (k = 0; k < i; k++)
                                                 stemp += s.charAt(k);
                                          text.setText(stemp);
                                   }
                                   else
                                          text.setText(s);
                            }
                            clear = false;
                     }
                     if (temp == quyu){
                            text.setText("0");
                            clear = false;
                     }
                     if (temp == fu){
                            boolean isNumber = true;
                            String s = text.getText();
                            for (int i = 0; i < s.length(); i++)
                                   if (!(s.charAt(i) >= '0' && s.charAt(i) <= '9' || s.charAt(i) == '.' ||
                                   s.charAt(i) == '-')){
                                          isNumber = false;
                                          break;
                                   }
                            if (isNumber == true){  //ǰַĸ'-',Ǹ,ٰʱ,׷ȥ 
                                   if (s.charAt(0) == '-'){
                                          text.setText("");
                                          for (int i = 1; i < s.length(); i++){
                                                 char a = s.charAt(i);
                                                 text.setText(text.getText() + a);
                                          }
                                   } //ǰַһַǷţһĸ 
                                   else
                                          text.setText('-' + s);
                            }
                     }
              }
              catch (Exception eee){
                     System.out.println("There is a wrong");
                     text.setText("There is a wrong");
                     clear = false;
              }
       }
 class WindowDestroyer extends WindowAdapter{//˳ڶ
  public void windowClosing(WindowEvent e)
 {  System.exit(0); }
 }
class objConversion{
 public String decDec (int decNum) {//10
  String strDecNum = Integer.toString(decNum);
   for (int i = strDecNum.length(); i < 3; i++)
       strDecNum = "0" + strDecNum;
  return invert (strDecNum, 5);
 }
 public String decHex (int decNum){//10 to 16
  String strHexNum = "";
  int currentNum = 0;
   while (decNum != 0) {
   if (decNum > 15){
    currentNum = decNum % 16;
    decNum /= 16;
    }
   else  {
    currentNum = decNum;
    decNum = 0;
   }
   switch (currentNum) {
    case 15: strHexNum += "F";
       break;
    case 14: strHexNum += "E";
       break;
    case 13: strHexNum += "D";
       break;
    case 12: strHexNum += "C";
       break;
    case 11: strHexNum += "B";
       break;
    case 10: strHexNum += "A";
       break;
    default: strHexNum += Integer.toString(currentNum);
       break;    
   } 
  }
  return invert (strHexNum, 2); 
 }
 public String decOct (int decNum){//10 to 8
  String strOctNum = "";
  while (decNum != 0){
   if (decNum > 7) {
    strOctNum += Integer.toString(decNum % 8);
    decNum /= 8;
   }
   else {
    strOctNum += Integer.toString(decNum);
    decNum = 0; 
   }  
  }
  return invert (strOctNum, 3); 
 }
 public String decBin (int decNum) {//10 to 2
  String strBinNum = "";
  while (decNum != 0) {
     if (decNum > 1) {
    strBinNum += Integer.toString(decNum % 2);
    decNum /= 2; 
   }
   else{ 
    strBinNum += Integer.toString(decNum);
    decNum = 0;
   } 
  }
  return invert (strBinNum, 8); 
 }
 private String invert (String strNum, int minLength) {
 
  String answer = "";
  int length = strNum.length();
  if (length < minLength){ 
   for (int padding = (minLength - length); padding > 0; padding--) {
    answer += "0";
   }
  }
  for (int i = length; i > 0; i--)
   answer += strNum.charAt (i - 1);
  return answer;
 }
}
 public static void main(String arg[]){// {
  calculator win = new calculator(); 
  win.setVisible(true);
 }
 }