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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.   ForDimChange() {
  15.     x = y = 0;
  16.     update();
  17.   }
  18.   void update() {
  19.     boolean flag = false;
  20.     dim = getSize();
  21.     if (x != dim.width) {
  22.       x = dim.width;      
  23.       flag = true;
  24.     }
  25.     if (y != dim.height) {
  26.       y = dim.height;
  27.       flag = true;
  28.     }
  29.     if (flag) {
  30.       buff = createImage(x, y);
  31.       ct = buff.getGraphics();
  32.     }
  33.   }
  34.   int get_dimx() { return x; }
  35.   int get_dimy() { return y; }  
  36.   Image get_buff() { return buff; }
  37.   Graphics get_ct() { return ct; }
  38. }
  39.  
  40. public class Main extends Applet implements Runnable {
  41.   boolean chkx = true, chky = true;
  42.   int x = 250, y = 140;
  43.   Thread th;
  44.   ForDimChange fdc;
  45.  
  46.   class ForDimChange {
  47.     private Dimension dim;
  48.     private Image buff;
  49.     private Graphics ct;
  50.     private int x, y;
  51.     ForDimChange() {
  52.       x = y = 0;
  53.       update();
  54.     }
  55.     void update() {
  56.       boolean flag = false;
  57.       dim = getSize();
  58.       if (x != dim.width) {
  59.         x = dim.width;      
  60.         flag = true;
  61.       }
  62.       if (y != dim.height) {
  63.         y = dim.height;
  64.         flag = true;
  65.       }
  66.       if (flag) {
  67.         buff = createImage(x, y);
  68.         ct = buff.getGraphics();
  69.       }
  70.     }
  71.     int get_dimx() { return x; }
  72.     int get_dimy() { return y; }  
  73.     Image get_buff() { return buff; }
  74.     Graphics get_ct() { return ct; }
  75.   }
  76.  
  77.   public void init() {
  78.     fdc = new ForDimChange();
  79.     th = new Thread(this);
  80.     th.start();
  81.   }
  82.  
  83.   public void run() {
  84.     try {
  85.       while (true) {
  86.         fdc.update();
  87.         if (chkx) x++; else x--;
  88.         if (chky) y++; else y--;
  89.         if (x == fdc.get_dimx()) chkx = false;
  90.         if (x == 0) chkx = true;
  91.         if (y == fdc.get_dimy()) chky = false;
  92.         if (y == 0) chky = true;
  93.  
  94.         repaint();
  95.         Thread.sleep(10);
  96.       }
  97.     } catch (InterruptedException e) { };
  98.   }
  99.   public void update(Graphics g) {
  100.     paint(g);
  101.   }
  102.   public void paint(Graphics g) {
  103.     Graphics ct;
  104.     ct = fdc.get_ct();
  105.     ct.setColor(Color.white);
  106.     ct.fillRect(0, 0, fdc.get_dimx(), fdc.get_dimy());
  107.     ct.setColor(Color.red);
  108.     ct.fillRect(x, y, 20, 20);
  109.     g.drawImage(fdc.get_buff(), 0, 0, this);
  110.   }
  111. }
  112. /* end */
  113.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin 
Standard input is empty
compilation info 
Main.java:20: cannot find symbol
symbol  : method getSize()
location: class ForDimChange
    dim = getSize();
          ^
Main.java:30: cannot find symbol
symbol  : method createImage(int,int)
location: class ForDimChange
      buff = createImage(x, y);
             ^
2 errors
stdout 
Standard output is empty
https://ideone.com/4ApOc
language:
Java (HotSpot 12)
created:
12 years ago
visibility:
public

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