Any tip would be useful.
Thank you in advance.

I have this problem to solve:
Create a Java application that will teach the elementary school student to
learn the multiplication. Use Math.random() to produce two positive numbers
and then display a question: How much is x times y?
let the user enter the answer into a text field. Check the answer and give
one of the following comments:
Responses to correct answers:
Very Good.
Nice Work.
Keep up with the good work.
Response to incorrect answers:
No. Please try again.
Wrong. Try once more.
Don't give up.
No. Keep trying.
Use Math.random() to generate random numbers from 1 to 4 that will be used
to select the appropriate response. Use a switch structure in the paint()
method to issue the responses.

So far I have done this:

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

public class ElementarySchool extends JApplet
implements ActionListener
private Container c;
JTextField T1;
JPanel Pan,Pan1,Pan2;
JLabel L1, L2, L3,e1,e2,e3,e4;
JButton calc;
String Question, Valuation;
int n1, n2, tot, res;

public void init()
c = getContentPane();
c.setLayout(new BorderLayout());

Pan = new JPanel();
Pan.setLayout(new GridLayout(2,1));
c.add(Pan, BorderLayout.NORTH);

Pan1 = new JPanel();
Pan1.setLayout(new GridLayout(2,1));
c.add(Pan1, BorderLayout.CENTER);

Pan2 = new JPanel();
Pan2.setLayout(new GridLayout(2,3));
c.add(Pan2, BorderLayout.SOUTH);

T1 = new JTextField(null, JTextField.CENTER);
T1.setFont(new Font("Verdana", Font.BOLD,20));
String msg = T1.getText();

L1 = new JLabel("Learn the Multiplication!",JLabel.CENTER);
L1.setFont(new Font("Verdana", Font.PLAIN, 32));
for(int x = 0; x < 10; x++)
n1 = 1 + (int)(10 * Math.random() - 1);
n2 = 1 + (int)(10 * Math.random() - 1);
tot = n1 * n2;

res = Integer.parseInt(msg);
L2 = new JLabel("How much is " + n1 + " times " + n2 + " ?", JLabel.CENTER);
L2.setFont(new Font("Verdana", Font.ITALIC, 24));
if(res == tot)
{L3 = new JLabel("Nice Work!",JLabel.CENTER);
L3.setFont(new Font("Verdana", Font.ITALIC, 24));}
{L3 = new JLabel("No. Try again",JLabel.CENTER);
L3.setFont(new Font("Verdana", Font.ITALIC, 24));}

e1 = new JLabel("");
e2 = new JLabel("");
e3 = new JLabel("");
e4 = new JLabel("");

calc = new JButton("Calc");

public void actionPerformed (ActionEvent e)
JOptionPane.showMessageDialog(null, "Enter the first number");
public void paint(Graphics g)