Java Lommeregner

Har lavet denne lommeregner man kan ikke finde ud af at få det med komma'er til at virker nogle der kan hjælpe og eventuelt rette i min lommeregner hvis i synes der skal lave nogle rettelser

koden til komma'er skulle vist være temp = temp * Double.parseDouble(nyTekst); men kan ikke få det til at virke

import java.awt.*;
import java.awt.event.*;

public class RegneMaskine3 extends Frame implements ActionListener
{

 

  TextField tekstfelt1 = new TextField("0",11);
 

  
  Button button0 = new Button();
  Button button1 = new Button();
  Button button2 = new Button();
  Button button3 = new Button();
  Button button4 = new Button();
  Button button5 = new Button();
  Button button6 = new Button();
  Button button7 = new Button();
  Button button8 = new Button();
  Button button9 = new Button();
  Button buttonc = new Button();
  Button buttonPlus = new Button();
  Button buttonMinus = new Button();
  Button buttonGange = new Button();
  Button buttonDele = new Button();  
  FlowLayout FlowLayout1 = new FlowLayout();


  public RegneMaskine3() {
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }

  private void jbInit() throws Exception {
    button0.setLabel("0");
    button1.setLabel("1");
    button2.setLabel("2");
    button3.setLabel("3");
    button4.setLabel("4");
    button5.setLabel("5");
    button6.setLabel("6");
    button7.setLabel("7");
    button8.setLabel("8");
    button9.setLabel("9");
    buttonc.setLabel("c");
    buttonPlus.setLabel("+");
    buttonMinus.setLabel("-"); 
    buttonGange.setLabel("*");
    buttonDele.setLabel("/");

    
 

    this.setLayout(new FlowLayout());
    this.add(tekstfelt1, null);
    this.add(button1, null);
    this.add(button2, null);
    this.add(button3, null);
    this.add(button4, null);
    this.add(button5, null);
    this.add(button6, null);
    this.add(button7, null);
    this.add(button8, null);
    this.add(button9, null);
    this.add(button0, null);
    this.add(buttonc, null);
    this.add(buttonPlus, null);
    this.add(buttonMinus, null);
    this.add(buttonGange, null);
    this.add(buttonDele, null);


   
	
	
  
   tekstfelt1.addActionListener(this); 

   button0.addActionListener(this); 
   button1.addActionListener(this); 
   button2.addActionListener(this); 
   button3.addActionListener(this);
   button4.addActionListener(this); 
   button5.addActionListener(this); 
   button6.addActionListener(this); 
   button7.addActionListener(this);
   button8.addActionListener(this); 
   button9.addActionListener(this); 
   buttonc.addActionListener(this);
   
   buttonPlus.addActionListener(this);
   buttonGange.addActionListener(this);
   buttonMinus.addActionListener(this);
   buttonDele.addActionListener(this);
   
}
      String gammelTekst = "";
      String nyTekst  = "";
      double temp = 0;
      
    public void actionPerformed(ActionEvent e)
    {
     
    
     if(e.getSource() != buttonPlus && e.getSource() != buttonMinus && e.getSource() != buttonGange
 && e.getSource() != buttonDele && e.getSource() != buttonc)
        {
          nyTekst = gammelTekst + ((Button) e.getSource()).getLabel();
          gammelTekst = nyTekst;
        }
       tekstfelt1.setText("" + nyTekst); 



	if(e.getSource() == buttonPlus){
	temp = temp + Integer.parseInt(nyTekst);
         tekstfelt1.setText("" + temp ); 
         gammelTekst = ("");}


    
	if(e.getSource() == buttonMinus){
	temp = temp - Integer.parseInt(nyTekst);
         tekstfelt1.setText("" + temp ); 
         gammelTekst = ("");}



	if(e.getSource() == buttonGange){
	temp = temp * Integer.parseInt(nyTekst);
         tekstfelt1.setText("" + temp ); 
         gammelTekst = ("");}
   
// temp=temp*Integer.parseInt(ny Tekst)


	if(e.getSource() == buttonDele){
	temp = temp / Integer.parseInt(nyTekst);
         tekstfelt1.setText("" + temp ); 
         gammelTekst = ("");}
   


	if(e.getSource() == buttonc){
	temp = (0);
         tekstfelt1.setText("0"); }
        

}}