java中double型資料的加減乘除
阿新 • • 發佈：2019-01-04
publicclass Arith {
privatestaticfinalint DEF_DIV_SCALE =10;
/**
* 兩個Double數相加
* @param v1
* @param v2
* @return Double
*/publicstatic Double add(Double v1,Double v2){
BigDecimal b1 =new BigDecimal(v1.toString());
BigDecimal b2 =new BigDecimal(v2.toString());
}
/**
* 兩個Double數相減
* @param v1
* @param v2
* @return Double
*/publicstatic Double sub(Double v1,Double v2){
BigDecimal b1 =new BigDecimal(v1.toString());
BigDecimal b2 =new BigDecimal(v2.toString());
return b1.subtract(b2).doubleValue();
}
* 兩個Double數相乘
* @param v1
* @param v2
* @return Double
*/publicstatic Double mul(Double v1,Double v2){
BigDecimal b1 =new BigDecimal(v1.toString());
BigDecimal b2 =new BigDecimal(v2.toString());
return b1.multiply(b2).doubleValue();
}
/**
* 兩個Double數相除
*
* @param v2
* @return Double
*/publicstatic Double div(Double v1,Double v2){
BigDecimal b1 =new BigDecimal(v1.toString());
BigDecimal b2 =new BigDecimal(v2.toString());
return b1.divide(b2,DEF_DIV_SCALE,BigDecimal.ROUND_HALF_UP).doubleValue();
}
/**
* 兩個Double數相除，並保留scale位小數
* @param v1
* @param v2
* @param scale
* @return Double
*/publicstatic Double div(Double v1,Double v2,int scale){
if(scale<0){
thrownew IllegalArgumentException(
"The scale must be a positive integer or zero");
}
BigDecimal b1 =new BigDecimal(v1.toString());
BigDecimal b2 =new BigDecimal(v2.toString());
return b1.divide(b2,scale,BigDecimal.ROUND_HALF_UP).doubleValue();
}
}
privatestaticfinalint DEF_DIV_SCALE =10;
/**
* 兩個Double數相加
* @param v1
* @param v2
* @return Double
*/publicstatic Double add(Double v1,Double v2){
BigDecimal b1 =new BigDecimal(v1.toString());
BigDecimal b2 =new BigDecimal(v2.toString());
}
/**
* 兩個Double數相減
* @param v1
* @param v2
* @return Double
*/publicstatic Double sub(Double v1,Double v2){
BigDecimal b1 =new BigDecimal(v1.toString());
BigDecimal b2 =new BigDecimal(v2.toString());
return b1.subtract(b2).doubleValue();
}
* 兩個Double數相乘
* @param v1
* @param v2
* @return Double
*/publicstatic Double mul(Double v1,Double v2){
BigDecimal b1 =new BigDecimal(v1.toString());
BigDecimal b2 =new BigDecimal(v2.toString());
return b1.multiply(b2).doubleValue();
}
/**
* 兩個Double數相除
*
* @param v2
* @return Double
*/publicstatic Double div(Double v1,Double v2){
BigDecimal b1 =new BigDecimal(v1.toString());
BigDecimal b2 =new BigDecimal(v2.toString());
return b1.divide(b2,DEF_DIV_SCALE,BigDecimal.ROUND_HALF_UP).doubleValue();
}
/**
* 兩個Double數相除，並保留scale位小數
* @param v1
* @param v2
* @param scale
* @return Double
*/publicstatic Double div(Double v1,Double v2,int scale){
if(scale<0){
thrownew IllegalArgumentException(
"The scale must be a positive integer or zero");
}
BigDecimal b1 =new BigDecimal(v1.toString());
BigDecimal b2 =new BigDecimal(v2.toString());
return b1.divide(b2,scale,BigDecimal.ROUND_HALF_UP).doubleValue();
}
}