/*Factory.java*/
package koala;
public class Factory   //工廠類
{
	public static IfourSpecies creator(double opd1,double opd2,char optr) throws BadOperatorException,DivideZeroException
	{
		if(optr=='+')
		{
			return new Add(opd1,opd2);
		}
		else if(optr=='-')
		{
			return new Min(opd1,opd2);
		}
		else if(optr=='*')
		{
			return new Mul(opd1,opd2);
		}		
		else if(optr=='/')
		{
			if(opd2==0) 
				throw new DivideZeroException("Error:divisor can not be zero！");
			return new Div(opd1,opd2);
		}		
		else
		{
			throw new BadOperatorException("Bad Operator"+optr);  //非法運算符
		}
		
	}
}