Witam, mam pytanie - czytam sobie "Thinking in Java 4th ed." i natrafilem na taki kod:
import java.util.*;
abstract class Shape {
void draw() { System.out.println(this + ".draw()"); }
abstract public String toString();
}
class Circle extends Shape {
public String toString() { return "Circle"; }
}
class Square extends Shape {
public String toString() { return "Square"; }
}
class Triangle extends Shape {
public String toString() { return "Triangle"; }
}
public class Shapes {
public static void main(String[] args) {
List<Shape> shapeList = Arrays.asList(
new Circle(), new Square(), new Triangle()
);
for(Shape shape : shapeList)
shape.draw();
}
} /* Output:
Circle.draw()
Square.draw()
Triangle.draw()
Moglby ktos wyjasnic krok po kroku co tu sie dzieje (biorac pod uwage, ze dopiero zaczynam nauke programowania)? Wyjasnienia z ksiazki jakos nie chwytam :/