Someone

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


public class applet extends JApplet implements ActionListener
{

    // vars
    private JTextField txtInput = new JTextField("Name", 10);
    private JButton btnClick = new JButton("Upload");

    public applet() {
        this.getContentPane().setLayout(new FlowLayout());
        
        btnClick.addActionListener(this);
        
        this.getContentPane().add(txtInput);
        this.getContentPane().add(btnClick);
    }
    
    public void actionPerformed(ActionEvent btnClick) {
        JTextField txtIn = new JTextField("Ok", 100);
        System.out.println("fu");
    }

}