Problem with backspace

Question

Please help with this small problem have been coding a calculator program for several weeks and have everything working except the backspace button would really appreciate some help the code for my action performed class which would contain the code is posted below thanks in advance
     public void actionPerformed(ActionEvent e){
               char currentOperator;
               String newNumberField = newTextField.getText();
               if(!beenBefore){
                    num1 = new Integer(newNumberField).intValue();
                    lastOperator = e.getActionCommand().charAt(0);
                    currentOperator = e.getActionCommand().charAt(0);
                    beenBefore = true;
               else{
                    num2 = new Integer(newNumberField).intValue();
                    currentOperator = e.getActionCommand().charAt(0);
                    switch(lastOperator){
                         case '+': num1 = num1+num2;
                                     break;
                         case '-': num1 = num1-num2;
                                     break;
                         case '*': num1 = num1*num2;
                                     break;
                         case '/': num1 = num1/num2;
                                     break;
                    lastOperator = currentOperator;
               if(currentOperator == '=')
                    newTextField.setText(String.valueOf(num1));
               else
                    newTextField.setText("");
               if(currentOperator == 'C')
                    beenBefore = false;
            if(e.getActionCommand().equals("1/x"))
                  newTextField.setText(String.valueOf(1/num1));
              if (e.getActionCommand().equals("Backspace"))

Answer 1

why even bother posting a reply if ur goin to be like that I'v tried several methods keep getting errors heres one I tried
if (e.getActionCommand().equals("Backspace")
  String.valueOf(num1) = String.valueOf(num1)(0, String.valueOf(num1) - 1);I'm only looking for some help man an it aint homework either whats ur problem