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

public class Liitmine extends Applet implements ActionListener{

TextField text1=new TextField(20);
TextField text2=new TextField(20);
TextField res=new TextField(14);
Button button=new Button("Liita");  
  
public Liitmine(){

add(text1);
add(text2);
add(res);
add(button);


text1.addActionListener(this);
text2.addActionListener(this);
res.addActionListener(this);
button.addActionListener(this);
}


public void actionPerformed(ActionEvent a_e)
{
String act = a_e.getActionCommand();
if (act.equals("Liita"))
{
double a = Double.valueOf(text1.getText()).doubleValue();
double b = Double.valueOf(text2.getText()).doubleValue();
double c = a + b;
res.setText(String.valueOf(c));
}
}
public static void main(String[] argumendid){
    Frame f=new Frame("Ratsionaalarvude liitmine");
    f.add(new Liitmine());
    f.setSize(300, 300);
    f.setVisible(true);
  }

}