calculator.java

通过JAVA设计 GUI 界面的计算器程序

         sele();
          prekey = key = 2;
        }
        //'/'操作
        if (temp == buttonDiv) {
           sele();
            prekey = key = 3;
        }
       
      }
       
      //'='操作
      if (temp == buttonEqual && clickable == true) {
        //如果连续按'=',则进行连续运算
       if (fchange==2)
       {equal();
       }else{
       	fristchange();
       equal1();
       lastchange();
       }
       
      }
      //'%'操作，对第二个操作数除以100
      if (temp == buttonmod && clickable == true) {
      	frist=false;
        if (answerd == 0) {
          String s = textAnswer.getText();
          textAnswer.setText(s);
        }
        else {
          boolean isDot = false;
          for (int i = 0; i < textAnswer.getText().length(); i++)
            if ('.' == textAnswer.getText().charAt(i)) {
              isDot = true;
              break;
            }
          //如果是double数，除100
          if (isDot == true) {
            double dtemp = Double.parseDouble(textAnswer.getText());
            dtemp = dtemp / 100.0;
            textAnswer.setText(Double.toString(dtemp));
          }
          else {
            //如果是int数但能被100整除，则去掉末尾两个零
            if (Integer.parseInt(textAnswer.getText()) % 100 == 0) {
              int itemp = Integer.parseInt(textAnswer.getText());
              itemp /= 100;
              textAnswer.setText(Integer.toString(itemp));
            }
            //如果是int数，但不能被100整除，则按double数处理
            else {
              double dtemp = Double.parseDouble(textAnswer.getText());
              dtemp = dtemp / 100.0;
              textAnswer.setText(Double.toString(dtemp));
            }
          }
        }
      }
      //开根号运算
      if (temp ==buttonsqrt && clickable == true) {
      	frist=false;
        String s = textAnswer.getText();
        if (s.charAt(0) == '-') {
          textAnswer.setText("负数不能开根号");
          clickable = false;
        }
        else
          textAnswer.setText(Double.toString(java.lang.Math.sqrt(Double.
              parseDouble(textAnswer.getText()))));
      }
      
      //倒数运算
      if (temp == buttonDao && clickable == true) {
      	frist=false;
        if (textAnswer.getText().charAt(0) == '0' &&
            textAnswer.getText().length() == 1) {
          textAnswer.setText("零不能求倒数");
          clickable = false;
        }
        else {
          boolean isDec = true;
          int i, j, k;
          String s = Double.toString(1 / Double.parseDouble(textAnswer.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);
            textAnswer.setText(stemp);
          }
          else
            textAnswer.setText(s);
        }
      }
      //+++++++++++++++科学计算方法//sin值++++++++++++++++++++++++++++++++++++++
      if (temp == bsin && clickable == true) {//sin
       frist=false;
       int tInt =Integer.parseInt(textAnswer.getText());
    double tDou = tInt * 3.1415926/180;
      textAnswer.setText(""+Math.sin(tDou));
          }
      if (temp == bcos && clickable == true) {//cos
       frist=false;
                 int tInt =Integer.parseInt(textAnswer.getText());
    double tDou = tInt * 3.1415926/180;
     textAnswer.setText(""+Math.cos(tDou));
      }
      if (temp == btan && clickable == true) {//tan
       frist=false;
                 int tInt =Integer.parseInt(textAnswer.getText());
    double tDou = tInt * 3.1415926/180;
      textAnswer.setText(""+Math.tan(tDou));
      }
      if (temp == bpi && clickable == true) {//pi
       frist=false;
          textAnswer.setText(Double.toString(java.lang.Math.PI*(Double.
              parseDouble(textAnswer.getText()))));
      }
       if (temp == bln && clickable == true) {//ln
          frist=false;
          if(fchange==2)
          {textAnswer.setText(Double.toString(java.lang.Math.log(Double.
              parseDouble(textAnswer.getText()))));}
          else
          { fristchange();
            textAnswer.setText(Double.toString(java.lang.Math.log(Integer
                .parseInt(textAnswer.getText()))));
            long jj=Math.round((Double.parseDouble(textAnswer.getText()))); 
  	        textAnswer.setText(String.valueOf(jj));
          	   lastchange();    }    
              }
      if (temp == bmod && clickable == true) {//mod
          frist=false;
          if(fchange==2){answerd = Double.parseDouble(textAnswer.getText());
          }else{
          	fristchange();
          	ianswer=Integer.parseInt(textAnswer.getText());
            lastchange();
          }
          
         //textAnswer.setText(String.valueOf(answerd)); 
          prekey = key = 4;
      }
      if (temp == bn && clickable == true) {//n
       int i,s=1;
       frist=false;
        fristchange();
       long n=Math.round((Integer.parseInt(textAnswer.getText())));  
         
         if(n>0){
         	for (i=1;i<=n;i++)
         	{s*=i;}
         }else{
         	for (i=-1;i>=n;i--)
         	{  	s*=i;   }
         	}
         textAnswer.setText(String.valueOf(s));
         lastchange();  
      }
       if (temp == bx2 && clickable == true) {//bx2
       frist=false;
       if(fchange==2){
       	double o;
       o =  Double.parseDouble(textAnswer.getText());
        textAnswer.setText(String.valueOf(o*=o));
       }else {
       fristchange();
       long o;
       o =  Integer.parseInt(textAnswer.getText());
        textAnswer.setText(String.valueOf(o*=o));
        lastchange();}
       
      }
      if (temp == bx3 && clickable == true) {//bx3
       frist=false;
       if(fchange==2){
       	double o,o1;
        o = Integer.parseInt(textAnswer.getText());
        o1=o;
        o*=o;
        textAnswer.setText(String.valueOf(o*=o1));
       }else {
       fristchange();
        long o,o1;
        o = Integer.parseInt(textAnswer.getText());
        o1=o;
        o*=o;
        textAnswer.setText(String.valueOf(o*=o1));
        lastchange();
      }
      }
      if (temp == bxy && clickable == true) {//bxy
           frist=false;
           
       if(fchange==2)
       {answerd = Double.parseDouble((textAnswer.getText()));
       }else{
       	fristchange();
       	ianswer = Integer.parseInt(textAnswer.getText());
       	lastchange();
       }
       
        prekey = key =6;
      }
      //按下'+/-'按钮时处理
      if (temp == buttonAddAndSub && clickable == true) {
        boolean isNumber = true;
        String s = textAnswer.getText();
        //S记录当前显示框中的数字
        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) {
          //如果当前字符串首字母有'-'号,代表现在是个负数,再按下时,则将首符号去掉
          if (s.charAt(0) == '-') {
            textAnswer.setText("");//清空显示框，把S记录中原数据显示回来
            for (int i = 1; i < s.length(); i++) {
              char a = s.charAt(i);
              textAnswer.setText(textAnswer.getText() + a);
            }
          }
          //如果当前字符串第一个字符不是符号，则添加一个符号在首字母处
          else
            textAnswer.setText('-' + s);
        }
      }
      //进制转换***********************************
      if(temp==rb1){//16进制
      	tempmid();
      	tsix();//使用ABCDEF键
      	fbutton();//关闭SIN，COS等标准计算器功能
      	tnumball();
      	textAnswer.setText( Integer.toHexString(Integer
      	.parseInt(textAnswer.getText())));
      	fchange=1;
      	mid=1;
      	vard = answerd = 0;
        ivard=ianswer=0;
      	}
      else if(temp==rb2){//10进制
        fsix();
      	tbutton();
      	tnumball();
      	tempmid();
      	long jj=Math.round((Double.parseDouble(textAnswer.getText())));
      	textAnswer.setText( String.valueOf(jj));
      	mid=2;
      	fchange=2;
        vard = answerd = 0;
        ivard=ianswer=0;      	
      	}
      else if(temp==rb4) {//8进制
        fnumb8();tempmid();
        fsix();//禁止ABCDEF键
      	fbutton();//关闭SIN，COS等标准计算器功能
      	textAnswer.setText(Integer.toOctalString(Integer
      	.parseInt(textAnswer.getText())));
      	fchange=4;
      	mid=4;
        vard = answerd = 0;
        ivard=ianswer=0;     	
      	}
      else if(temp==rb3){//2进制
      	fsix();fbutton();fnumb2();
        vard = answerd = 0;
        ivard=ianswer=0;
      	tempmid();
      	textAnswer.setText(Integer.toBinaryString(Integer
      	.parseInt(textAnswer.getText())));
        fchange=3;
      	mid=3;
      	}
      //计算器有关内存操作==========================================
      //'MC'的操作，将内存清0
      if (temp == buttonMC && clickable == true) {
      	frist=false;
        memoryd = memoryi = 0;
        textMemory.setText("");
      }
      //'MS'的操作，将当前文本框内容保存入内存，显示'M'
      if (temp == buttonMS && clickable == true) {
      	frist=false;
        boolean isDot = false;
        textMemory.setText("   M");
        for (int i = 0; i < textAnswer.getText().length(); i++)
          if ('.' == textAnswer.getText().charAt(i)) {
            isDot = true;
            break;
          }
        //如果是double,则存入memoryd(double存储器)
        if (isDot == true) {
        	
          memoryd = Double.parseDouble(textAnswer.getText());
          memoryi = 0; //保证存储器中存放最新的值
        }
        //如果是int,则存入memoryi(int存储器)
        else {
          memoryi = Integer.parseInt(textAnswer.getText());
          memoryd = 0; //保证存储器中存放最新的值
        }
      }
      //'MR'的操作，将存储器中的信息输出
      if (temp == buttonMR && clickable == true) {
      	frist=false;
        if (memoryd != 0)
          textAnswer.setText(Double.toString(memoryd));
        if (memoryi != 0)
          textAnswer.setText(Integer.toString(memoryi));
      }
      //'M+'的功能，将当前文本框里的数据和存储器中数据相加后，再存入存储器
      if (temp == buttonMAdd && clickable == true) {
      	frist=false;
        boolean isDot = false;
        for (int i = 0; i < textAnswer.getText().length(); i++)
          if ('.' == textAnswer.getText().charAt(i)) {
            isDot = true;
            break;
          }
        if (memoryi != 0) { //存储中是一个int型数
          if (isDot == false) //被加数是一个int型数
            memoryi += Integer.parseInt(textAnswer.getText());
          else { //被加数是一个double型数，则将int存储器中数传入double存储器与当前数相加，int存储器清零
            memoryd = memoryi + Double.parseDouble(textAnswer.getText());
            memoryi = 0;
          }
        }
        else
          memoryd += Double.parseDouble(textAnswer.getText());
      }
      //按下'Backspace'键，利用循环将当前字符串中的最后一个字母删除
      if (temp == buttonBk && clickable == true) {
        String s = textAnswer.getText();
        textAnswer.setText("");
        for (int i = 0; i < s.length() - 1; i++) {
          char a = s.charAt(i);
          textAnswer.setText(textAnswer.getText() + a);
        }
      }
      //按下'CE'按钮，将当前文本框内数据清除
      if (temp == buttonCe) {
        textAnswer.setText("0");
        clickable = true;
      }
      //按下'C'按钮，文本框内数据清除，同时var,answer清0
      if (temp == buttonC) {
        vard = answerd = 0;
        ivard=ianswer=0;
        textAnswer.setText("0");
        clickable = true;
      }
      //按下'复制'菜单栏
      if (temp == copyItem) {
        copy = textAnswer.getText();
      }
      //按下'粘贴'菜单栏
      if (temp == pasteItem) {
        textAnswer.setText(copy);
      }
      if (temp == sItem) {
      	frame.setTitle("科学计算器");
        view();
        frame.pack();
      }
      if (temp == tItem) {
       frame.setTitle("标准计算器");
       rb2.setSelected(true);
       tnumball();
       tbutton();
       visi();
       frame.pack();
      }
      //按下'帮助主题'菜单栏
      if (temp == topHelp) {
        JOptionPane.showMessageDialog(panel, scrollHelp);
      }
      //按下'数字分组'菜单栏
      if (temp == numberGroup) {
        if (numberGroup.getText().compareTo("   数字分组(I)") == 0)
          numberGroup.setText("√数字分组(I)");
        else
          numberGroup.setText("   数字分组(I)");
      }
      //按下'关于'菜单栏
      if (temp == aboutCal) {
        JOptionPane.showMessageDialog(panel, "计算器1.00版\n开发者：王超");
      }
    }
    //输入中如果有操作非法，比如按下两次'+'，捕获异常
    catch (Exception e) {
      textAnswer.setText("操作非法");
      clickable = false;
    }
   
  }
  //主函数
  public static void main(String args[]) {
    new Calculator();
  }
  public void visi()//隐藏科学计算器的功能，变成标准计算器
  {	buttonsqrt.setEnabled(true);