java - Why are my items not showing up in JFrame?

Question

I'm fairly new to JFrame and I want to know why my items are not showing up on the window. I know i dont have a ActionHandler but I just want my textfield's to show up on my window. Here's my code:

import java.awt.Font;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;

public class FirstGUI extends JFrame{
    public void GUI(){
       setTitle("Welcome");
       setResizable(false);
       setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       setVisible(true);
       setSize(600,600);

       JLabel title = new JLabel();
       title.setText("Apple Inc. Member Login Port");
       title.setFont(new Font("Arial", Font.PLAIN, 24));

       JTextField login = new JTextField("Login",10);

       JPasswordField pass = new JPasswordField("Password");

       add(title);
       add(login);
       add(pass);

   }

    public static void main(String[] args){
        FirstGUI a = new FirstGUI();
        a.GUI();
    }
}

but when i run it i get this:

Answer 1

but when i run it i get this:

You get an empty screen because you add the components to the frame after the frame is visible.

1. As has already been suggested you need to use an appropriate layout manager. FlowLayout is the easiest to start with.
2. invoke setVisible(true) AFTER adding the components to the frame.

So the code should be more like:

panel.add(...);
panel.add(...);
add(panel);
pack();
setVisible(true);