src/main/java/com/rockagen/commons/util/Arith.java
public static float mul(final float v1,final float v2){
    	BigDecimal b1 = new BigDecimal(Float.toString(v1));
    	BigDecimal b2 = new BigDecimal(Float.toString(v2));
    	return b1.multiply(b2).floatValue();
    }
public static float mul(final float v1,final float v2){
    	BigDecimal b1 = new BigDecimal(Float.toString(v1));
    	BigDecimal b2 = new BigDecimal(Float.toString(v2));
    	return b1.multiply(b2).floatValue();
    }
mul
@param v1 left value
@param v2 right value
@return v1*v2