Nothing showing up after I run Applet

Question

I am very new to Java and am working on a simple applet as a homework project... I compile it without any syntax errors, but it doesn't show up in Main as anything but a blank screen and the words "applet started". Could I please have some proofreading/advice on how to fix it? Thanks

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

public class Module6Project extends JApplet
{
public static void main (String[] args) {
    JFrame f=new JFrame("Module6Project"); 
    f.setBackground(Color.blue); 
    f.getContentPane().setLayout(null);
    f.setSize(500,500);
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 



JTextField first = new JTextField("First name", 150);
JTextField second = new JTextField("Last name", 200);
JTextField third = new JTextField("DoB", 75);
JTextField fourth = new JTextField("Address", 350);
JTextField fifth = new JTextField("Additional comments", 250);
JButton OK = new JButton("OK");
JButton Cancel = new JButton("Cancel");
}}

Answer 1

You seem confused. Applet(s) run in a web browser, not by main(). Next, you have an Applet (you don't want a JFrame). Finally, you need to add your components to a container. I'd normally use a JPanel, but you can use an JApplet or a JFrame.

class Module6Project extends JApplet {
  @Override
  public void init() {
    // Not a new Frame, "this" applet.
    this.setBackground(Color.blue);
    this.getContentPane().setLayout(null);
    // this.setSize(500, 500);

    JTextField first = new JTextField("First name",
        150);
    JTextField second = new JTextField("Last name",
        200);
    JTextField third = new JTextField("DoB", 75);
    JTextField fourth = new JTextField("Address", 350);
    JTextField fifth = new JTextField(
        "Additional comments", 250);
    JButton OK = new JButton("OK");
    JButton Cancel = new JButton("Cancel");
    // add everything to the container (or it won't be visible)
    this.add(first);
    this.add(second);
    this.add(third);
    this.add(fourth);
    this.add(fifth);
    this.add(OK);
    this.add(Cancel);
  }
}