将字符串转换为Double或从bigdecimal转换为Double而不丢失Java中的任何精度

Question

I am converting String value to Double or from BigDecimal value to Double using double.value() method in Java. But after converting to double, the precision values are truncated. Ex. Str="123.50" or bigDecimalVal="455.780" If I convert these above values to Double using double.valueOf() method , I'm getting the double value as:

123.5 or 455.78.

Where '0' is truncated in both the output I've got.

Answer 1

123.5 and 123.50 both are same mathematically ,If you want proper format value then you can create a holder which will hold both value one for display one for double.

class DoubleDecorator {
    final double val;
    final String string;
    DoubleDecorator(String str) {
        string = str;
        val = Double.parseDouble(str);
    }

   public String getDisplayValue(){
      return string;
   }
   public double getFormattedValue(NumberFormat format){
   //your code
   }
   public double getValue(){
     return val;
   }
   }