Swing/AWT/SWT :: Extending Classes And Importing Libraries Basics?

1. Tried to use setLayout() but it wouldn't let me. Have imported libs

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

but it doesn't work. It only worked when I extended a class with JFrame. Why do I have to do it? I already have a JFrame instance:

public test(){
JFrame frame = new JFrame();
frame.setTitle("Workshop");
frame.setBounds(500,300,400,300);
frame.setVisible(true);
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
....
}

This code runs smooth, so it's confusing for me that it lets me create a JFrame object, and put buttons onto it, but it wants me to extend the class onto JFrame class in order to use a method.

2. I've read somewhere that AWT is old and should not be used anymore. Is there a diagram or a list with objects and properties that are manipulated only by Swing so that I could concentrate only on those? For example (made up list):

JPaper -

- width, setWidth(x)
- height, setHeight(x)
- position, setPosition(x,y)
- color, setBackground(RGBa)
- acquire, add(subordinate component)
- deprive, remove( subordinate comopnent)
- etc...

JSticker -

- width ...
- height ...
- write, setText(String)
- etc...