import javax.swing.*;
import javax.swing.border.*;
import java.awt.*;
import java.awt.event.*;
import java.text.NumberFormat ;

public class Temperature extends JApplet implements ActionListener{

  private String inputString;
  private JLabel promptLabel = new JLabel("Enter Degrees to be Converted: ");
  private JTextField promptField = new JTextField(4);
  private final int NOPTIONS = 2;
  private JPanel mainPanel = new JPanel();
  private ButtonGroup optGroup = new ButtonGroup();
  private JTextArea display = new JTextArea(5,15);
  private JButton calc = new JButton("Convert Degrees");

  private JRadioButton options[] = new JRadioButton[NOPTIONS];
  private String optionLabels[] =
    {"Farenheit", "Celsius"};

  public void init(){

    mainPanel.setBorder(BorderFactory.createTitledBorder("Temperature Converter"));
    mainPanel.setLayout(new FlowLayout());

    calc.addActionListener(this);
    mainPanel.add(promptLabel);
    mainPanel.add(promptField);
    initOptions();

    mainPanel.add(calc);
    mainPanel.add(display);
    getContentPane().add(mainPanel);
    setSize(300,400);
  }//init

  private double convertStringToDouble(String s){
    Double doubleObject = Double.valueOf (s);
    return doubleObject.doubleValue ();
  }//convertString

  private void initOptions(){


    for (int k=0; k<options.length; k++){
      options[k] = new JRadioButton(optionLabels[k]);
      //options[k].addItemListener(this);
      mainPanel.add(options[k]);
      optGroup.add(options[k]);
    }//for
  }//initOptions

  public double farenheitToCelsius(double t){
    return ((t - 32)/ 1.8);
  }

  public double celsiusToFarenheit (double t){
    return((t * 1.8) + 32);
  }

  public void actionPerformed(ActionEvent e){
    double temp = convertStringToDouble(promptField.getText ());

    if(options[0].isSelected ()){
     display.append ("The temperature is " + celsiusToFarenheit(temp) + "\n");
    }

      if(options[1].isSelected ()){
        display.append("The temperature is " + farenheitToCelsius(temp) + "\n");
      }
   

  }//actionPerformed
}//OrderApplet