Creating a simple window in Java.

AwtExample.java

import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

public class AwtExample {
    /*Abstract Window Toolkit Example */
    public static void main(String[] args) {
        Awt window = new Awt("Test");
        window.setVisible(true);
    }
}

class Awt extends Frame {

    public Awt(String title) {
        super(title);
        setSize(500,400);
        addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }

    @Override
    public void paint(Graphics g) {
        super.paint(g);
        Font sansSerifLarge = new Font("SansSerif", Font.BOLD, 20);
        Font sansSerifSmall = new Font("SansSerif", Font.BOLD, 12);
        g.setFont(sansSerifLarge);
        g.drawString(" Hello, world", 60, 60);
        g.setFont(sansSerifSmall);
        g.drawString("Lorem ipsum dolor", 60, 100);
    }
}