public class Mult implements Knoten {
	Knoten op1;
	Knoten op2;
	public Mult(Knoten op1, Knoten op2) {
		super();
		this.op1 = op1;
		this.op2 = op2;
	}
	@Override
	public int rechne() {
		return op1.rechne()*op2.rechne();
	}
	@Override
	public void welcome(Besucher b) {
		b.visit(this);
	}

}