Help!

import java.awt.<em>;

import java.awt.event.</em>;

import javax.swing.*;

public class Sorveteria extends JFrame implements ActionListener

{

JLabel L1,L2,L3,L4,L5,L6,L7,L8;

JTextField T1,T2,T3,T4,T5,T6,T7,T8,T9;

JButton B1,B2;

JPasswordField P1;

public static void main(String[] args) 
{
    JFrame sorveteria = new Sorveteria();
    sorveteria.setUndecorated(true);
    sorveteria.getRootPane().setWindowDecorationStyle(JRootPane.FRAME);
    sorveteria.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    sorveteria.setVisible(true);
           
}
    
 
public Sorveteria() 
{
    setTitle("Sorveteria");
    setBounds(350,400,500,150);
    getContentPane().setBackground(new Color(150,150,150));
    getContentPane().setLayout(new GridLayout( 6,8 ));
    L1= new JLabel("Tipo de Sorvete");
    L1.setForeground(Color.black);
    L1.setFont(new Font("",Font.BOLD,14));
    L2= new JLabel("QTDE");
    L2.setForeground(Color.black);
    L2.setFont(new Font("",Font.BOLD,14));
    L3= new JLabel("Preço Unitário");
    L3.setForeground(Color.black);
    L3.setFont(new Font("",Font.BOLD,14));
    L4= new JLabel("Picolé Frutas");
    L4.setForeground(Color.black);
    L4.setFont(new Font("",Font.BOLD,14));
    L5= new JLabel("Chocolate/Frutas");
    L5.setForeground(Color.black);
    L5.setFont(new Font("",Font.BOLD,14));
    L6= new JLabel("Bola");
    L6.setForeground(Color.black);
    L6.setFont(new Font("",Font.BOLD,14));
    L7= new JLabel("Pote de 2 Litros");
    L7.setForeground(Color.black);
    L7.setFont(new Font("",Font.BOLD,14));
    L8= new JLabel("Total");
    L8.setForeground(Color.red);
    L8.setFont(new Font("",Font.BOLD,14));
    B1= new JButton("Calcular");   B1.addActionListener(this);
    B2= new JButton("Limpar");     B2.addActionListener(this);
    T1= new JTextField();
    T2= new JTextField(); 
    T3= new JTextField();
    T4= new JTextField();
    T5= new JTextField();
    T6= new JTextField();
    T7= new JTextField();
    T8= new JTextField();
    T9= new JTextField();
    add( L1 ); add( T1 );
    add( L2 ); add( T2 );
    add( L3 ); add( T3 );
    add( L4 ); add( T4 );
    add( L5 ); add( T5 );
    add( L6 ); add( T6 );
    add( L7 ); add( T7 );
    add( L8 ); add( T8 );
    add( T9 ); add( B1 ); 
    add( B2 );
        
           
}

public void actionPerformed(ActionEvent e) 
{
    if (e.getSource()==B2)
          {
              T1.setText(""); 
              T2.setText(""); 
              T3.setText("");
              T4.setText("");
              T5.setText("");
              T6.setText("");
              T7.setText("");
              T8.setText("");
              T9.setText("");
              
              return;
          }
         
    float N1=0, N2=0, N3=0, N4=0, N5=0, N6=0, N7=0, N8=0, Total=0;
          try
          {
              N1=Float.parseFloat(T1.getText());
              N2=Float.parseFloat(T2.getText());
              N3=Float.parseFloat(T3.getText());
              N4=Float.parseFloat(T4.getText());
              N5=Float.parseFloat(T5.getText());
              N6=Float.parseFloat(T6.getText());
              N7=Float.parseFloat(T7.getText());
              N8=Float.parseFloat(T8.getText());
              
          }
          catch(NumberFormatException erro)
          {
              T9.setText("Erro!");
              return;
          }
               if (e.getSource()==B1) Total=( N1*N2 )+( N3*N4 )+( N5*N6 )+( N7*N8 );
                    T9.setText(""+Total);
          
          
}