circle

I have been trying to write this circle method that should move the
circle two places of width to the right, the method I have written I get
errors from is below

public void moveRight()

{
moveHorizontal(60);
}




* The class Circle defines a shape with the characteristics of a circle.
*
* xxxxxxxxxxxx
* xxxxxxxxxxxx
*/

public class Circle extends OUAnimatedObject
{
/* Instance variables */

private int diameter;
private CKColour colour;
private int xPos;
private int yPos;



/**
* Constructor for objects of class Circle with the default
characteristics.
*/
public Circle()
{
this.diameter = 20;
this.colour = CKColour.BLUE;
this.xPos = 0;
this.yPos = 0;
}

/* Instance methods */

/**
* Causes execution to pause for 500 milliseconds (half a second).
*/
public void sleep()
{
try
{
Thread.sleep(500);
}
catch (Exception e)
{
System.out.println("Exception has occurred in the sleep()
method");
}
}


/**
* Sets the diameter of the receiver to the value of the argument
aDiameter
*/
public void setDiameter(int aDiameter)
{
this.diameter = aDiameter;
this.update();
}

/**
* Returns the diameter of the receiver.
*/
public int getDiameter()
{
return this.diameter;
}

/**
* Sets the colour of the receiver to the value of the argument
aColour.
*/
public void setColour (CKColour aColour)
{
this.colour = aColour;
this.update();
}

/**
* Returns the colour of the receiver.
*/
public CKColour getColour ()
{
return this.colour;
}

/**
* Sets the horizontal position of the receiver to the value of the
argument x.
*/
public void setXPos(int x)
{
this.xPos = x;
this.update();
}

/**
* Returns the horizontal position of the receiver.
*/
public int getXPos()
{
return this.xPos;
}

/**
* Sets the vertical position of the receiver to the value of the
argument y.
*/
public void setYPos(int y)
{
this.yPos = y;
this.update();
}

/**
* Returns the vertical position of the receiver.
*/
public int getYPos()
{
return this.yPos;
}

/**
* Returns a string representation of the receiver.
*/
public String toString()
{
return "An instance of class "+ this.getClass().getName()
+ ": position (" + this.getXPos() + ", " + this.getYPos()
+ "), diameter " + this.getDiameter() + ", colour " +
this.getColour();
}



/**
* Moves position of receiver two places to the right.
*/
public void moveRight()

{

moveRight (20);

}
.

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