Vector object (float)

//Code by Grey Hugentobler, March 31st, 2011

package GravityApplet;

public class Vector
{
	public float xCoordinate;
	public float yCoordinate;

	//create the Vector
	public Vector(float x, float y)
	{
		this.xCoordinate = x;
		this.yCoordinate = y;
	}

	//get the x Coordinate of the Vector
	public float x()
	{
		return this.xCoordinate;
	}

	//get the y Coordinate of the Vector
	public float y()
	{
		return this.yCoordinate;
	}

	//add two Vectors
	public Vector add(Vector that)
	{
		return new Vector(this.xCoordinate + that.xCoordinate, this.yCoordinate + that.yCoordinate);
	}

	//get the negative of a vector
	public Vector negative()
	{
		return new Vector(-this.xCoordinate, -this.yCoordinate);
	}

	//subtract one vector from another
	public Vector subtract(Vector that)
	{
		return this.add(that.negative());
	}

	//get the dot product of two Vectors
	public float dot(Vector that)
	{
		return this.xCoordinate*that.xCoordinate + this.yCoordinate*that.yCoordinate;
	}

	//Multiply a Vector by a scalar
	public Vector multiply(float that)
	{
		return new Vector(that * this.xCoordinate, that * this.yCoordinate);
	}

	//return the distance between the endpoints of two Vectors
	public float distance(Vector that)
	{
		return Math.round(Math.sqrt((this.subtract(that)).dot(this.subtract(that))));
	}
}