Java GUI basics (AWS and Swing?!)

/*
 "What are AWT and Swing used for?"
 the two GUI (Graphical User Interface) packages that provide good libraries!
 Swing > AWT, but Swing is based on AWT so we need to call AWT anyways.
 -> bc Swing has more stuff + isn't OS-based so it looks same on both Windows and Mac
 cannot mix-use Swing and AWT components (buttons, windows, panels, labels, etc)
 
 * try to avoid using the Main method to create panels, pls make a new frame class
 * "frame class"
 * 	 public class nameOfClass extends JFrame { public nameOfClass() {constructor stuff} }

 * Containers: JFrame, JPanel
 * Components: JButton, JLabel
*/



import java.awt.*;
// AWT (Abstract Windowing Toolkit) = heavy weight components based on OS
import javax.swing.*;
// Swing = light weight components not based on OS
// components start with J (JButton, JWindows) to not confuse with AWS

public class Main extends JFrame{
	// parent function is JFrame, meaning Main will take on everything JFrame alr has.
	// Main can also be called anything else.
	/* 1. Container name (c) = getContentPane();   <- creates a panel
	 * 2. call on name (c) and use different set methods
	 * 3. JButton name (btn) = new JButton();
	 * 4. call on name (btn) and use different set methods
	 * 5. now show your artwork!! {setTitle("--"), setSize(00, 00), setVisible(true)}
	 */

	Main(){
	// constructor for the Class named Main
		super();
		// the command for making a new frame!
		Container c = getContentPane();
		// Three parts to a JFrame: Menu Bar, Content Pane, Frame
		// Content Panes are created with a JFrame, and are Container types
		c.setLayout(new GridLayout());
		c.setLayout(new FlowLayout());
		c.setLayout(new BorderLayout());
		
		JButton btn = new JButton("ok");
		
		btn.setBackground(Color.red);
		btn.setForeground(Color.white);
		// btn.setSize(200, 300);    <= usable only for FlowLayout
		
		JLabel la = new JLabel("HELLO");
		
		c.add(btn);
		c.add(la);
		c.add(new JButton("cancel"));
		
		setSize(500, 300);
		setVisible(true);
	}
	public static void main(String[] args) {
		new Main();
		// java only uses Main method!! call on Main() the constructor.
	}
}

// A REVIEW OF INHERITANCE!!!

//class A{
//	public A() {
//		System.out.println("con A");
//	}
//}
//
//class B extends A{
//	public B() {
//		super();
//		System.out.println("con B");
//	}
//}
//
//class Main{
//	public static void main(String[] args) {
//		B obj = new B();
//	}
//}