JAVA GUI : برنامج لحساب المضروب

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import java.awt.GridLayout;

import java.awt.event.*;

import javax.swing.*;

public class Factorial extends JFrame implements ActionListener{

JTextField number;

JButton press;

JLabel Result;

JPanel myPanel;

public Factorial(){

myPanel = new JPanel(new GridLayout(3 ,1, 20 ,0 ));

number = new JTextField(10);

myPanel=new JPanel();

number=new JTextField(10);

press=new JButton("press");

Result=new JLabel(" ");

press.addActionListener(this);

myPanel.add(number);

myPanel.add(press);

myPanel.add(Result);

this.add(myPanel);

} 

public static void main(String[]args){

Factorial fact=new Factorial();

fact.setTitle("Factorial");

fact.setSize(300,100);

fact.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

fact.setVisible(true);

}

@Override

public void actionPerformed(ActionEvent event) {

if(event.getSource()==press){

int num = Integer.parseInt(number.getText()) ; 

int fact=1;

for(int i=1;i<=num;i++)

fact*=i;

Result.setText(""+fact);

}

}

}