BigDecimal to string
JavaStringBigdecimalJava Problem Overview
I have a BigDecimal object and i want to convert it to string. The problem is that my value got fraction and i get a huge number (in length) and i only need the original number in string for example: for
BigDecimal bd = new BigDecimal(10.0001)
System.out.println(bd.toString());
System.out.println(bd.toPlainString());
the output is:
10.000099999999999766941982670687139034271240234375
10.000099999999999766941982670687139034271240234375
and i need the out put to be exactly the number 10.0001
in string
Java Solutions
Solution 1 - Java
To get exactly 10.0001
you need to use the String constructor or valueOf
(which constructs a BigDecimal based on the canonical representation of the double):
BigDecimal bd = new BigDecimal("10.0001");
System.out.println(bd.toString()); // prints 10.0001
//or alternatively
BigDecimal bd = BigDecimal.valueOf(10.0001);
System.out.println(bd.toString()); // prints 10.0001
The problem with new BigDecimal(10.0001)
is that the argument is a double
and it happens that doubles can't represent 10.0001
exactly. So 10.0001
is "transformed" to the closest possible double, which is 10.000099999999999766941982670687139034271240234375
and that's what your BigDecimal
shows.
For that reason, it rarely makes sense to use the double constructor.
You can read more about it here, https://stackoverflow.com/questions/4937402/moving-decimal-places-over-in-a-double
Solution 2 - Java
Your BigDecimal
doesn't contain the number 10.0001
, because you initialized it with a double
, and the double
didn't quite contain the number you thought it did. (This is the whole point of BigDecimal
.)
If you use the string-based constructor instead:
BigDecimal bd = new BigDecimal("10.0001");
...then it will actually contain the number you expect.
Solution 3 - Java
For better support different locales use this way:
DecimalFormat df = new DecimalFormat();
df.setMaximumFractionDigits(2);
df.setMinimumFractionDigits(0);
df.setGroupingUsed(false);
df.format(bigDecimal);
also you can customize it:
DecimalFormat df = new DecimalFormat("###,###,###");
df.format(bigDecimal);
Solution 4 - Java
By using below method you can convert java.math.BigDecimal to String.
BigDecimal bigDecimal = new BigDecimal("10.0001");
String bigDecimalString = String.valueOf(bigDecimal.doubleValue());
System.out.println("bigDecimal value in String: "+bigDecimalString);
Output:
bigDecimal value in String: 10.0001
Solution 5 - Java
// Convert BigDecimal number To String by using below method //
public static String RemoveTrailingZeros(BigDecimal tempDecimal)
{
tempDecimal = tempDecimal.stripTrailingZeros();
String tempString = tempDecimal.toPlainString();
return tempString;
}
// Recall RemoveTrailingZeros
BigDecimal output = new BigDecimal(0);
String str = RemoveTrailingZeros(output);
Solution 6 - Java
The BigDecimal can not be a double. you can use Int number. if you want to display exactly own number, you can use the String constructor of BigDecimal .
like this:
BigDecimal bd1 = new BigDecimal("10.0001");
now, you can display bd1 as 10.0001
So simple. GOOD LUCK.
Solution 7 - Java
To archive the necessary result with double constructor you need to round the BigDecimal before convert it to String e.g.
new java.math.BigDecimal(10.0001).round(new java.math.MathContext(6, java.math.RoundingMode.HALF_UP)).toString()
will print the "10.0001"
Solution 8 - Java
>If you just need to set precision quantity and round the value, the right way to do this is use it's own object for this.
BigDecimal value = new BigDecimal("10.0001");
value = value.setScale(4, RoundingMode.HALF_UP);
System.out.println(value); //the return should be "10.0001"
>One of the pillars of Oriented Object Programming (OOP) is "encapsulation", this pillar also says that an object should deal with it's own operations, like in this way: