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package template.series3;
interface Series {
void next();
void print();
}
class SeriesFactory {
private SeriesFactory() {}
public static Series newArith() { return new ConcreteSeries(new OpAdd()); }
public static Series newGeom() { return new ConcreteSeries(new OpMul()); }
}
class ConcreteSeries implements Series {
int x;
int y = 1;
public void next() { x++; y = op.eval(y,2); }
public void print() { System.out.println("x=" + x + "; y=" + y); }
Op op;
ConcreteSeries(Op op) { this.op = op; }
}
interface Op { public int eval(int x, int y); }
class OpAdd implements Op { public int eval(int x, int y) { return x+y; } }
class OpMul implements Op { public 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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