Polymorphism: Difference between revisions

=={{header|Ceylon}}==

<lang ceylon>import ceylon.language {

consolePrint = print

}

shared void run() {

class Point {

shared variable Integer x;

shared variable Integer y;

shared new(Integer x = 0, Integer y = 0) {

this.x = x;

this.y = y;

}

shared new copy(Point p) {

this.x = p.x;

this.y = p.y;

}

shared default void print() {

consolePrint("[Point ``x`` ``y``]");

}

}

class Circle extends Point {

shared variable Integer r;

shared new(Integer x = 0, Integer y = 0, Integer r = 0) extends Point(x, y) {

this.r = r;

}

shared new copy(Circle c) extends Point.copy(c){

this.r = c.r;

}

shared actual void print() {

consolePrint("[Circle ``x`` ``y`` ``r``]");

}

}

value shapes = [

Point(), Point(1), Point(1, 2), Point {y = 3;}, Point.copy(Point(4, 5)),

Circle(), Circle(1), Circle(2, 3), Circle(4, 5, 6), Circle {y = 7; r = 8;}, Circle.copy(Circle(9, 10, 11))

];

for(shape in shapes) {

shape.print();

}

}

</lang>