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  1. import java.applet.Applet;
  2. import java.awt.Graphics;
  3. import java.awt.Color;
  4. import java.awt.Image;
  5. import java.awt.Dimension;
  6.  
  7. /* <applet code="Main.class" width="500" height="500"></applet> */
  8.  
  9. class ForDimChange {
  10.   private Dimension dim;
  11.   private Image buff;
  12.   private Graphics ct;
  13.   private int x, y;
  14.   private Applet applet;
  15.   ForDimChange(Applet applet) {
  16.     this.applet = applet;
  17.     x = y = 0;
  18.     this.update();
  19.   }
  20.   void update() {
  21.     boolean flag = false;
  22.     dim = applet.getSize();
  23.     if (x != dim.width) {
  24.       x = dim.width;      
  25.       flag = true;
  26.     }
  27.     if (y != dim.height) {
  28.       y = dim.height;
  29.       flag = true;
  30.     }
  31.     if (flag) {
  32.       buff = applet.createImage(x, y);
  33.       ct = buff.getGraphics();
  34.     }
  35.   }
  36.   int get_dimx() { return x; }
  37.   int get_dimy() { return y; }  
  38.   Image get_buff() { return buff; }
  39.   Graphics get_ct() { return ct; }
  40. }
  41.  
  42. public class Main extends Applet implements Runnable {
  43.   final static int square_size = 20;
  44.   final static int quantum = 5;
  45.   boolean chkx = true, chky = true;
  46.   int x = 250, y = 140;
  47.   Thread th;
  48.   ForDimChange fdc;
  49.  
  50.   public void init() {
  51.     fdc = new ForDimChange(this);
  52.     th = new Thread(this);
  53.     th.start();
  54.   }
  55.  
  56.   public void run() {
  57.     try {
  58.       while (true) {
  59.         fdc.update();
  60.         if (chkx) x++; else x--;
  61.         if (chky) y++; else y--;
  62.         if (x >= fdc.get_dimx() - square_size) chkx = false;
  63.         if (x <= 0) chkx = true;
  64.         if (y >= fdc.get_dimy() - square_size) chky = false;
  65.         if (y <= 0) chky = true;
  66.  
  67.         repaint();
  68.         Thread.sleep(quantum);
  69.       }
  70.     } catch (InterruptedException e) { };
  71.   }
  72.   public void update(Graphics g) {
  73.     paint(g);
  74.   }
  75.   public void paint(Graphics g) {
  76.     Graphics ct;
  77.     ct = fdc.get_ct();
  78.     ct.setColor(Color.white);
  79.     ct.fillRect(0, 0, fdc.get_dimx(), fdc.get_dimy());
  80.     ct.setColor(Color.red);
  81.     ct.fillRect(x, y, square_size, square_size);
  82.     g.drawImage(fdc.get_buff(), 0, 0, this);
  83.   }
  84. }
  85. /* end */
  86.  
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
spoj: The program compiled successfully, but main class was not found.
      Main class should contain method: public static void main (String[] args).
stdout
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Standard output is empty
https://ideone.com/vWRuO
language:
Java (HotSpot 12)
created:
12 years ago
visibility:
public

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