Develop an applet that receives an integer in one text field, and computes its factorial Value and returns it in another text field, when the button named “Compute” is clicked

//Program to find factorial of a given number
import java.awt.*;
import java.awt.event.*;
import java.applet.*;


/*<applet code="Factorial" width=500 height=200></applet>*/


public class Factorial extends Applet implements ActionListener
{
            TextField input,output;
            Button compute;
            int fact=0;
            public void init()
            {
                        compute=new Button("Compute");
                        Label inp=new Label("Enter any number :",Label.RIGHT);
                        Label opt=new Label("Factorial of the given number is : ",Label.RIGHT);
                        input=new TextField(5);
                        output=new TextField(10);
                        input.setBackground(Color.pink);
                        output.setBackground(Color.pink);
                        add(inp);
                        add(input);
                        add(opt);
                        add(output);
                        add(compute);
                        output.setText("0");
                        output.setEditable(false);
                        input.addActionListener(this);
                        output.addActionListener(this);
                        compute.addActionListener(this);
            }
            public void actionPerformed(ActionEvent ae)
            {         
                        String str=ae.getActionCommand();
                        if(str.equals("Compute"))
                        {
                                    fact=1;
                                    int n=Integer.parseInt(input.getText());
                                    if(n<=12)
                                    {
                                                for(int i=n;i>=2;i--)    
                                                fact=fact*i;
                                                output.setText(""+fact);
                                    }
                                    else
                                    fact=-1;
                                   
                        }
                        repaint();
                                               
            }
            public void paint(Graphics g)
            {         
                                    if(fact==-1) {
                                    output.setText("0");
                                    g.drawString("Sorry number exceeds greater than 12",10,100); }
            }
}