Исходный текст программы ColorRectangle.java

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// =======================================
// ColorRectangle.java
//
// (C) Alexandr Frolov, 1998
// E-mail: frolov@glasnet.ru
// Web:    http://www.glasnet.ru/~frolov
// =======================================

import java.awt.*;

public class ColorRectangle
{
  public static void main(String args[])
  {
    MyColorRect rect = new MyColorRect(
      0, 0, 10, 20, Color.black);
    
    String szStr = rect.toString();
    System.out.println(szStr); 

    rect.setMyRect(10, 20, 30, 40);
    rect.setColor(Color.red);
    
    szStr = rect.toString();
    System.out.println(szStr); 
    
  }
}

class MyColorRect extends MyRect
{
  protected Color rectColor;
  
  MyColorRect(int x1, int y1, 
    int x2, int y2, Color colr)
  {
    super(x1, y1, x2, y2);
    rectColor = colr;
  }
  
  public void setColor(Color colr)
  {
    rectColor = colr;
  }
  
  public String toString()
  {
    String sz = "Object MyRect: (" +
      x1 + ", " + y1 + ", " +
      x2 + ", " + y2 + "), " + 
      rectColor.toString();
      
    return sz;
  }
  
}

class MyRect
{
  protected int x1;
  protected int y1;
  protected int x2;
  protected int y2;
  
  MyRect(int x1, int y1, int x2, int y2)
  {
    this.x1 = x1;
    this.y1 = y1;
    this.x2 = x2;
    this.y2 = y2;
  }
  
  public void setMyRect(int x1, int y1,
    int x2, int y2)
  {
    this.x1 = x1;
    this.y1 = y1;
    this.x2 = x2;
    this.y2 = y2;
  }
  
  public String toString()
  {
    String sz = "Object MyRect: (" +
      x1 + ", " + y1 + ", " +
      x2 + ", " + y2 + ")";
      
    return sz;
  }
}

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