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public class Color
{
    private float[] color_components;

    public Color( float red, float green, float blue )
    {
        this.color_components = new float[]{ red, green, blue };
    }

    public Color( int red, int green, int blue )
    {
        this(red/255f, green/255f, blue/255f);
    }

    public int[] toIntegerArray()
    {
        return new int[] {
            (int) (this.color_components[0]*255),
            (int) (this.color_components[1]*255),
            (int) (this.color_components[2]*255)
        };
    }

    public float[] toFloatArray()
    {
        return this.color_components;
    }

    public void setColorComponents( float red, float green, float blue )
    {
        this.color_components[0] = red;
        this.color_components[1] = green;
        this.color_components[2] = blue;
    }

    public void setColorComponents( int red, int green, int blue )
    {
        this.setColorComponents( red/255f, green/255f, blue/255f );
    }

    public void multiply( Color color )
    {
        float[] colors = color.toFloatArray();
        for( int i = 0, ii = this.color_components.length; i < ii; i++ )
        {
            this.color_components[ i ] *= colors[ i ];
        }
    }

    public void screen( Color color )
    {

        float[] colors = color.toFloatArray();
        for( int i = 0, ii = this.color_components.length; i < ii; i++ )
        {
            this.color_components[ i ] = 1 - (1 - this.color_components[ i ]) * (1 - colors[ i ]);
        }
    }

    public void overlay( Color color )
    {
        float[] colors = color.toFloatArray();
        for( int i = 0, ii = this.color_components.length; i < ii; i++ )
        {
            float base = this.color_components[ i ];
            if( base < 0.5 )
            {
                this.color_components[ i ] = 2 * base * colors[ i ];
            }else
            {
                this.color_components[ i ] = 1 - 2 * (1 - base) * (1 - colors[ i ]);
            }
        }
    }

    public void hardLight( Color color )
    {
        float[] colors = color.toFloatArray();
        for( int i = 0, ii = this.color_components.length; i < ii; i++ )
        {
            float base = colors[ i ];
            if( base < 0.5 )
            {
                this.color_components[ i ] = 2 * base * this.color_components[ i ];
            }else
            {
                this.color_components[ i ] = 1 - 2 * (1 -base) * (1-this.color_components[ i ]);
            }
        }
    }

    public void softLight( Color color )
    {
        float[] colors = color.toFloatArray();
        for( int i = 0, ii = this.color_components.length; i < ii; i++ )
        {
            float source = colors[ i ];
            float base = this.color_components[ i ];

            if( source < 0.5 )
            {
                this.color_components[ i ] = (2 * base * source) + (float)(Math.pow( base, 2 ) * (1 - 2*source));
            }else
            {
                this.color_components[ i ] = (2 * base * (1 - source)) + (float)(Math.sqrt(base)*(2*source - 1));
            }
        }
    }

    public void invert()
    {
        for( int i = 0, ii = this.color_components.length; i < ii; i++ )
        {
            this.color_components[ i ] = 1 - this.color_components[ i ];
        }
    }

    public String toHex()
    {
        int[] col_components = this.toIntegerArray();
        return Integer.toHexString( 0x100 | col_components[0] ).substring(1) +
               Integer.toHexString( 0x100 | col_components[1] ).substring(1) +
               Integer.toHexString( 0x100 | col_components[2] ).substring(1);
    }

    public String toString()
    {
        return String.format("rgb(%.2f, %.2f, %.2f)", this.color_components[0],
                                                      this.color_components[1],
                                                      this.color_components[2]
        );
    }
}

class Vehicle
{
  //Vehicle stuff
}

class Car : Vehicle
{
  //Car stuff
}

class Ship : Vehicle
{
  //Ship stuff
}

class VehicleFactory
{
  Vehicle createRandomVehicle()
  {
     if(rand() % 2)
     {
       return new Ship();
     }
     else
     {
       return new Car();
     }
  }
}

public class Node<E>
{
    private E data;
    private ArrayList<Node<?>> edges;

    public Node( E data )
    {
        this.data = data;
        this.edges = new ArrayList<>();
    }

    public E getData()
    {
        return this.data;
    }

    public void addEdge( Node<?> n )
    {
        this.edges.add( n );
    }

    public Node<?>[] getEdges()
    {
        Node<?>[] edges = new Node<?>[ this.edges.size() ];
        return this.edges.toArray( edges );
    }

    public int getNumberOfEdges()
    {
        return this.edges.size();
    }

    public Node<?> getEdge( int index )
    {
        return this.edges.get( index );
    }
}

Node<Integer> node1 = new Node(10);
Node<String> node2 = new Node("Hello");

node1.addEdge(node2);