package towTimesMethods;
import java.math.BigDecimal;

public class MakeTowTimes {
	
	private static BigDecimal ConstTow = new BigDecimal("2.0");

	public static long Makelong(long num) {
		return num * 2;
	}

	public static double Makedouble(double num) {
		return num * 2;
	}

	public static Long MakeLong(Long num) {
		if (num == null) return 0L;
		return num * 2;
	}

	public static Double MakeDouble(Double num) {
		if (num == null) return 0D;
		return num * 2;
	}

	public static BigDecimal MakeBigDecimal(BigDecimal num) {
		if (num == null) return BigDecimal.ZERO;
		return num.multiply(ConstTow);
	}

	public static String MakeString(String str) {
		if (str == null) return "";
		return str + str;
	}
}