error :cannot find symbol

Hai, i got an error cannot symbol in my coding. Please help me to correct my coding please. I also highlight the line which give me an error

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Jantina extends Frame implements ActionListener { /* error Jantina is not abstract and does not override abstract method actionPerformed*/
JButton Btentu;
JTextField Tnoic, TJantina;
JLabel Lnoic, LJantina,LTajuk;

public static void main(String args[])
{
Jantina j = new Jantina("Jantina");
j.addWindowListener(new WindowEventhandler()); /*error non-static variable this cannot be referenced from a static context*/
j.setSize(200,250);
j.setVisible(true);
}

public Jantina(String str)
{
Super(str); /* error cannot find symbol*/
setLayout(new FlowLayout());
setLayout( new FlowLayout(FlowLayout.CENTER));
LTajuk = new JLabel("No Kad Pengenalan :");
Tnoic = new JTextField(15);
LJantina = new JLabel ("jantina");
TJantina = new JTextField(15);
Btentu = new JButton("Tentu");

}

public void actionPerforemed(ActionEvent e)
{
Object pilihan = e.getSource();
long nilai, noic;
noic = Long.parseLong(Tnoic.getText());
nilai = noic%2;
if ( nilai == 0)
TJantina.setText("Perempuan");
else
TJantina.setText("Lelaki");

}

class WindowEventhandler extends WindowAdapter
{
public void WindowClosing(WindowEvent e)
{

System.exit(0);
}
}
}