Wednesday, June 9, 2010

Example on Overloading

  • Each method has a signature: its name together with the number and types of its parameters

    String toString()
    void move(int dx, int dy)
    void paint(Graphics g)
    (int, int)

  • Two methods can have the same name if they have different signatures. They are overloaded.
  • Overloading Example

    Public class Point {

    protected double x, y;

    public Point() {

    x=0.0; y=0.0;


    public Point (double x, double y) {

    this.x=x; this.y=y;


    /**calculate the distance between this point and the other point*/

    public double distance (Point other) {

    double dx=this.x-other.x;

    double dy=this.y-other.y;

    return Math.sqrt(dx*dx+dy*dy);


    /**calculate the distance between this point and (x,y)*/
    public double distance(double x, double y) {
    double dx = this.x - x;
    double dy = this.y - y;
    return Math.sqrt(dx * dx + dy * dy);

    /**calculate the distance between this point and the origin*/
    public double distance() {
    return Math.sqrt(x * x + y * y);
    // other methods

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