nnc study source 01

import java.awt.Canvas;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Graphics;
 
import javax.swing.JFrame;
 
public class Fortress extends JFrame {
 
  /**
   * default serial id
   */
  private static final long serialVersionUID = -7065629910752205393L;
 
  private FortressCanvas canvas= null;
  public Fortress()
  {
    initalize();   
  }
 
  /**
   * 어플리케이션 초기화
   */
  private void initalize() {
    setSize(300, 300);
    setLocation(300, 300);
    System.out.println("layout name : " + getLayout().getClass().getName());
   
    canvas= new FortressCanvas();
    canvas.setSize(200, 200);
    canvas.setBackground(Color.BLACK);
   
    setLayout(new FlowLayout());
    add(canvas);
  }
 
  public static void main(String[] args)
  {
    Fortress app= new Fortress();
    app.run();
  }
 
  /**
   * 어플리케이션을 수행 합니다.
   */
  private void run() {
    setVisible(true);
  }
 
  class FortressCanvas extends Canvas {
   
    public FortressCanvas()
    {
      initalize_canvas();
    }
   
    private void initalize_canvas() {
      setForeground(Color.WHITE);
    }
 
    public void paint(Graphics g)
    {
      g.drawString("Hello nnc", 20, 100);
     
      g.setColor(Color.RED);
      g.drawRect(100, 100, 20, 20);
     
      g.setColor(Color.BLUE);
      g.drawRect(130, 100, 40, 40);
    }
  }
}