Parse bigdecimal to string in java

How to convert bigdecimal to string in java

This tutorial shows you how to convert bigdecimal to string in java.

Answer

In Java, you can convert a BigDecimal object to a String using the toString() method. Here’s an example:

import java.math.BigDecimal; public class BigDecimalToStringExample < public static void main(String[] args) < BigDecimal number = new BigDecimal("123.456"); String stringValue = number.toString(); System.out.println("BigDecimal as String: " + stringValue); > >
 
In this example, we create a BigDecimal object named number with a value of "123.456". Then, we convert it to a String using the toString() method and store it in the stringValue variable. Finally, we print the stringValue variable, which outputs "123.456" in this case.
 
Note
 
Note that the toString() method returns a string representation of the BigDecimal object, preserving its full precision. If you want to format the BigDecimal with specific rounding or formatting options, you can use the DecimalFormat class or other formatting methods.
 
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Java BigDecimal to String
 
In this post, we will see how to convert BigDecimal to String in java.
 
There are many ways to convert BigDecimal to String in java. Some of them are:
 
toString method
 
You can simply use BigDecimal’s toString method to convert BigDecimal to String.
 
When you run above program, you will get below output:
 
String’s ValueOf method
 
You can also use String’s ValueOf() method to convert BigDecimal to String but it internally uses BigDecimal’s toString method only, so it is better to use BigDecimal’s toString method
 
When you run above program, you will get below output:
 
Issues with toString
 
You might not find expected result when you use BigDecimal constructor which takes double as argument. 
For example:
 
When you run above program, you will get below output:
 
 Did you just expect 20.234 as output? 
I think Yes. But issue is when you use BigDecimal constructor which takes double as argument, double cannot represent 20.234 exactly. 
You need to either use String based constructor or use BigDecimal.valueOf method to solve this issue. 
We have already seen String based constructor in above example.
 
When you run above program, you will get below output:
 
That’s all about BigDecimal to String conversion.
 
You may also like:
 
 
How to Sum BigDecimal Using Stream in Java 
 
 
Java BigDecimal to Double 
 
 
Java BigDecimal to BigInteger 
 
 
Java BigInteger to BigDecimal 
 
 
BigDecimal divide 
 
 
BigDecimal round 
 
 
Java BigDecimal 
 
 
Java BigDecimal to String 
 
 
Java String to BigDecimal 
 
 
BigDecimal compareTo 
 
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How to convert BigDecimal to/from String in java examples
 
You can also check my previous posts on the BigInteger class in java.
 
java.math.BigDecimal class in java
 
This is a data type that can be used in financial and ERP applications where the precision of a number is important. BigDecimal is used to store the rounding of the numbers after arithmetic operations. It is an immutable type.
 
BigDecimal is a class declared in the java.math package of java language.
 
How do you create a BigDecimal in java?
 
Objects can be created using the constructor with string or double parameters.
 
// constructor with String parameter BigDecimal bigDecimal = new BigDecimal("147.87932"); System.out.println(bigDecimal); // constructor with Double parameter BigDecimal bigDecimal1 = new BigDecimal(147.87932); System.out.println(bigDecimal1);
 
147.87932 147.8793200000000069849193096160888671875
 
First example, create an object using the constructor with a string value, returned the correct actual value.
 
The second, created using the constructor with a double value, 147.87932 is converted to the closest double value 147.8793200000000069849193096160888671875.
 
Hope you understand How the BigDecimal object is created in java.
 
How to convert BigDecimal to String with an example in java?
 
In Java, we can convert BigDecimal to String in multiple ways.
The first is with the toString method, and the second is the toEngineeringString method. Finally, simple toPlainString method
 
Using toString() method
 
toString() method is available in any java class that extends java.lang.object class. It returns number string’s as String output. Syntax:
 
MathContext m = new MathContext(3); BigDecimal bg = new BigDecimal("3617E+4", m); System.out.println(bg.toString()); BigDecimal bd3 = new BigDecimal("567.12345678901234561243"); System.out.println(bd3.toString());
 
3.62E+7 567.12345678901234561243
 
Using toEngineeringString() method
 
This is also simple to convert with this approach.
 
The function toEngineeringString() returns the String value of a Bigdecimal object that does not have an exponent field. However, when compared to the function toString() method, this approach does not return the correct value in terms of scale value.
 
public String toEngineeringString()
 
Here is a complete example
 
MathContext m = new MathContext(3); BigDecimal bg = new BigDecimal("3617E+4", m); System.out.println(bg.toEngineeringString()); BigDecimal bd3 = new BigDecimal("567.12345678901234561243"); System.out.println(bd3.toEngineeringString());
 
36.2E+6 567.12345678901234561243
 
Using toPlainString() method
 
Third, there’s toPlainString() , which returns a plain String of a bigdecimal object without the exponent field.
 
public String toPlainString()
 
MathContext m = new MathContext(3); BigDecimal bg = new BigDecimal("3617E+4", m); System.out.println(bg.toPlainString()); BigDecimal bd3 = new BigDecimal("567.12345678901234561243"); System.out.println(bd3.toPlainString());
 
36200000 567.12345678901234561243 
 
It is an easy method and The String.valueOf() function in Java returns a string representation of any class.
 
 
Any object in class, like BigDecimal Returns:
 
string version of a provided object, in this case, BigDecimal Object
 
 
MathContext mc = new MathContext(3); BigDecimal bd = new BigDecimal("1237E+4", mc); System.out.println(String.valueOf(bd)); BigDecimal bd1 = new BigDecimal("123.12345678901234561243"); System.out.println(String.valueOf(bd1));
 
1.24E+7 123.12345678901234561243
 
How to Convert String to BigDecimal in Java?
 
It is very easy to do the conversion to BigDecimal from a given string, The simple approach is using the BigDecimal constructor
 
This constructor accepts string value, where the string is a number enclosed in double-quotes.
 
If the given number is not a number enclosed as a string, it gives NumberFormatException runtime error.
 
String stringObject="123.45"; BigDecimal bigDecimalObject=new BigDecimal(stringObject); System.out.println(bigDecimalObject);
 
NumberFormatException error This issue comes when the string contains a non-numeric character
 
String stringObject="123.45"; BigDecimal bigDecimalObject=new BigDecimal(stringObject); System.out.println(bigDecimalObject);
 
Exception in thread "main" java.lang.NumberFormatException
 
Conclusion
 
The fix is to BigDecimal will convert the string which contains numbers only. Try to avoid the String with non-numeric characters only.
 
Hope you understand the conversion of string and BigInteger in java.
 
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Java Convert BigDecimal to String
 
In this Java core tutorial we learn how to convert a BigDecimal value into a String value with different simple solutions in Java programming language.
 
Table of contents
 
Convert BigDecimal to String using toString() method
 
The first solution, we can use BigDecimalValue.toString() method get String value of a BigDecimal object as following Java program.
 
import java.math.BigDecimal; public class BigDecimalToStringExample1  public static void main(String. args)  BigDecimal bigDecimalValue = new BigDecimal(9999999.55555); String stringValue = bigDecimalValue.toString(); System.out.println(stringValue); > >
 
9999999.55554999969899654388427734375
 
Convert BigDecimal to String using String.valueOf() method
 
The second solution, we can use String.valueOf() to instantiate a String value from a BigDecimal object as the below Java example.
 
import java.math.BigDecimal; public class BigDecimalToStringExample2  public static void main(String. args)  BigDecimal bigDecimalValue = new BigDecimal(54321.99); String stringValue = String.valueOf(bigDecimalValue); System.out.println(stringValue); > >
 
54321.9899999999979627318680286407470703125
 
Format BigDecimal value using DecimalFormat class
 
With the third solution, we can use the java.text.DecimalFormat class to format a BigDecimal object to a String.
 
import java.math.BigDecimal; import java.text.DecimalFormat; public class BigDecimalToStringExample3  public static void main(String. args)  BigDecimal bigDecimalValue = new BigDecimal(9999999.123); DecimalFormat decimalFormat = new DecimalFormat(); decimalFormat.setMinimumFractionDigits(2); decimalFormat.setMaximumFractionDigits(10); decimalFormat.setGroupingUsed(false); String stringValue = decimalFormat.format(bigDecimalValue); System.out.println(stringValue); > >
 
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