a port of the Processing Visualization Language


// This example is a code fragment, 

// it will not compile on its own.

// Create the DragDrop subclass from

// the Button class. Button becomes

// the superclass of DragDrop.

class DragDrop extends Button {

  int xoff, yoff;

  DragDrop(int x, int y) {

    // Runs the superclass' constructor

    super(x, y);


  void press(int mx, int my) {

    // Runs the superclass' press() method


    xoff = mx;

    yoff = my;  


Description Keyword used to reference the superclass of a subclass.
Usage Web & Application
Related class

This reference is licensed under the CC BY-NC-SA 2.0 license:

Creative Commons License
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