java/canvas.java

   1 import javax.swing.*;
   2 import java.awt.*;
   3
   4 class DrawingCanvas extends Canvas {
   5   public DrawingCanvas() {
   6     setSize(100, 50);
   7   }
   8   public String text = new String("LOOOL");
   9   public void paint(Graphics g) {
  10                 createBufferStrategy(2); //double buffered
  11
  12                 Graphics2D g2D=(Graphics2D) g; // cast to 2D
  13     g2D.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
  14                          RenderingHints.VALUE_ANTIALIAS_ON);
  15
  16
  17     g.drawRect(0, 0, 99, 49); // draw border
  18     g.drawString(text, 20,20);
  19   }
  20 }
  21
  22 public class canvas {
  23         public static void main(String[] args) throws InterruptedException {
  24                 JFrame window = new JFrame();
  25                 window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  26                 window.setSize(640,480);
  27                 window.setTitle("hello");
  28                 window.setVisible(true);
  29
  30                 DrawingCanvas canvas = new DrawingCanvas();
  31                 window.getContentPane().add(canvas);
  32
  33                 Thread.sleep(2000);
  34     canvas.text="omg";
  35                 canvas.repaint();
  36         }
  37 }