// Point.java
// Definition of class Point

public class Point {
   private double x, y; // coordinates of the Point

   public Point( double a, double b ) { setPoint( a, b ); }

   public void setPoint( double a, double b )
   {
      x = a;
      y = b;
   }

   public double getX() { return x; }

   public double getY() { return y; }

   public String toString() 
      { return "[" + x + ", " + y + "]"; }

   public String getName() { return "Point"; }
}
==========
// Square.java
// Definition of class Square

public class Square {  
   private double side;
   private Point p;       // composition 

   public Square()  {  this( 0.0, 0.0, 0.0 );  }

   public Square( double s, double a, double b )
   {
      p = new Point( a, b );   // instantiate point object     
      setSide( s );  
   }

   public void setSide( double s )
      { side = ( s >= 0 ? s : 0 ); }

   public double getSide() { return side; }
   
   public double area() { return Math.pow( side, 2 ); }

   public String toString()
      { return "Corner = " + p.toString() + "; Side = " + side; }
  
   public String getName() { return "Square"; }

   public String getPointName() { return p.getName(); }

   public String getPointString() { return p.toString(); }
}
==============
// Cube.java
// Definition of class Cube

public class Cube {
   private double depth;  
   private Square s;       // composition
    
   public Cube( double m, double a, double b )      
   {
      s = new Square( m, a, b ); 
      depth = m;
   }
      
   public double getDepth() { return depth; }
   
   public double area() { return s.area() * 6; } 
     
   public double volume() { return s.area() * depth; }

   public String toString()
      { return s.toString() + "; Depth = " + depth; }
   
   public String getName() { return "Cube"; }
 
   public double getSquareArea() { return s.area(); }

   public String getSquareName() { return s.getName(); }
  
   public String getSquareString() { return s.toString(); }
 
   public String getSPointString() { return s.getPointString(); }

   public String getSPointName() { return s.getPointName(); }
}
=================
// Test.java
// Driver for point, square, cube composition program
import javax.swing.*;

public class Test {
   public static void main( String args[] )
   { 
      Cube cube = new Cube( 3.3, 10, 10 );
      String result = "";
   
      result += cube.getSPointName() + ": " +
                    cube.getSPointString();
   
      result += "\n" + cube.getSquareName() + ": " + 
                    cube.getSquareString();
   
      result += "\n" + cube.getName() + ": " +
                    cube.toString();
  
      result += "\n" + cube.getSPointName() +
                    ": " + cube.getSPointString();

      result += "\n" + cube.getSquareName() +
                    ": " + cube.getSquareString();
      result += "\n" + "Area = " + cube.getSquareArea();

      result += "\n" + cube.getName() +
                    ": " + cube.toString();
      result += "\n" + "Area = " + cube.area();
      result += "\n" + "Volume = " + cube.volume();            

      JOptionPane.showMessageDialog( 
            null, result, "Shapes",
            JOptionPane.INFORMATION_MESSAGE );   
      System.exit( 0 );  
   }
}