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Код

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class CF extends JApplet {
    JTextField celsius, farengait;
    @Override
    public void init() {
        super.init();
        setSize(260, 80);
    }
    public CF(){
        setLayout(new GridLayout(2, 2, 10, 10));
        add(new JLabel("Градусы Цельсия"));
        celsius = new JTextField();
        celsius.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                double C = Double.parseDouble(celsius.getText());
                double F = C*9.0 / 5 + 32;
                farengait.setText(String.valueOf(F));
            }
        });
        add(celsius);
        add(new JLabel("Градусы Фаренгейта"));
        farengait = new JTextField();
        farengait.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                double F = Double.parseDouble(farengait.getText());
                double C = 5.0 / 9 * (F-32);
                celsius.setText(String.valueOf(C));
            }
        });
        add(farengait);
    }
}