import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.BorderLayout;
import javax.swing.*;

public class Converter extends JFrame
{
    JLabel labelF = new JLabel("Fahrenheit:");
    JLabel labelC = new JLabel("Celcius:");
    JTextField fieldF = new JTextField(25);
    JTextField fieldC = new JTextField(25);
    
    JButton buttonClear = new JButton("Clear");
    
    class HandlerF implements ActionListener
    {
        public void actionPerformed(ActionEvent e)
        {
            String s = fieldF.getText();
            double value = Double.parseDouble(s);
            value *= 10;
            fieldC.setText(String.valueOf(value));
        }
    }

    class HandlerC implements ActionListener
    {
        public void actionPerformed(ActionEvent e)
        {
            fieldF.setText("event C executed");
        }
    }

    class Cleanup implements ActionListener
    {
        public void actionPerformed(ActionEvent e)
        {
            fieldF.setText("");
            fieldC.setText("");
        }
    }

    public Converter()
    {
        setTitle("Tem Converter");
    
        getContentPane().setLayout(new FlowLayout());
        getContentPane().add(labelF);
        getContentPane().add(fieldF);
        getContentPane().add(labelC);
        getContentPane().add(fieldC);
        getContentPane().add(buttonClear);
        
        fieldF.addActionListener(new HandlerF());
        fieldC.addActionListener(new HandlerC());
        buttonClear.addActionListener(new Cleanup());
        
        setVisible(true);
        setSize(400, 100);
    }

    public static void main(String args[])
    {
        Converter c = new Converter();
    }
}