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package template.series4;
interface Series {
void next();
void print();
}
class SeriesFactory {
private SeriesFactory() {}
public static Series newArith() { return new ArithSeries(); }
public static Series newGeom() { return new GeomSeries(); }
}
abstract class AbstractSeries implements Series {
int x;
int y = 1;
public void next() { x++; y = this.eval(y,2); }
public void print() { System.out.println("x=" + x + "; y=" + y); }
abstract protected int eval(int x, int y);
}
class ArithSeries extends AbstractSeries { protected int eval(int x, int y) { return x+y; } }
class GeomSeries extends AbstractSeries { protected int eval(int x, int y) { return x*y; } }
public class Main {
public static void main(String[] args) {
Series x = SeriesFactory.newGeom();
x.next();
x.next();
x.print();
}
}
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