Addition for BigDecimal

Question

I want to do some simple sums with some currency values expressed in BigDecimal type    BigDecimal test   new BigDecimal 0   System out println test   test add new BigDecimal 30    System out println test   test add new BigDecimal 45    System out println test     Obviously I do not understand well the BigDecimal arithmetics  see output behind   Test 0 0 0   Can anyone help me out

User · Accepted Answer

The BigDecimal is immutable so you need to do this   BigDecimal result   test add new BigDecimal 30    System out println result

User · Answer

It looks like from the Java docs here that add returns a new BigDecimal   BigDecimal test   new BigDecimal 0   System out println test   test   test add new BigDecimal 30    System out println test   test   test add new BigDecimal 45    System out println test

User · Answer

You can also do it like this   BigDecimal A   new BigDecimal  10000000000    BigDecimal B   new BigDecimal  20000000000    BigDecimal C   new BigDecimal  30000000000    BigDecimal resultSum    A  add B  add C   System out println  A B C      resultSum     Prints      A B C  60000000000

User · Answer

It s actually rather easy  Just do this   BigDecimal test   new BigDecimal 0   System out println test   test   test add new BigDecimal 30    System out println test   test   test add new BigDecimal 45    System out println test     See also  BigDecimal add java math BigDecimal

User · Answer

BigDecimal test   new BigDecimal 0   System out println test   test   test add new BigDecimal 30    System out println test   test   test add new BigDecimal 45    System out println test

User · Answer

you can do in this way   as BigDecimal is immutable so cant set values except in constructor  BigDecimal test   BigDecimal ZERO  BigDecimal result   test add new BigDecimal 30    System out println result    result would be 30

User · Answer

BigDecimal demo   new BigDecimal 15     It is immutable beacuse it internally store you input i e  15  as  final private final BigInteger intVal  and same concept use at the time of string creation every input finally store in  private final char value    So there is no implmented bug

User · Answer

Just another example to add BigDecimals  Key point is that they are immutable and they can be initialized only in the constructor  Here is the code   import java util    import java math     public class Main       public static void main String   args            Scanner sc          boolean first right number   false          BigDecimal initBigDecimal   BigDecimal ZERO          BigDecimal add1   BigDecimal ZERO          BigDecimal add2   BigDecimal ZERO           while   first right number                        System out print  Enter a first single numeric value                  sc   new Scanner System in               if  sc hasNextBigDecimal                                   first right number   true                  add1   sc nextBigDecimal                                     boolean second right number   false          while   second right number                        System out print  Enter a second single numeric value                  sc   new Scanner System in               if  sc hasNextBigDecimal                                   second right number   true                  add2   sc nextBigDecimal                                    BigDecimal result   initBigDecimal add add1  add add2           System out println  Sum of the 2 numbers is      result toString

User · Answer

BigInteger is immutable  you need to do this     BigInteger sum   test add new BigInteger 30        System out println sum

User · Answer

BigDecimal no   new BigDecimal 10     you can add like this also no   no add new BigDecimal 10    System out println no       20

User · Answer

Using Java8 lambdas   List lt BigDecimal gt  items   Arrays asList a  b  c           items stream   filter Objects  nonNull  reduce BigDecimal ZERO  BigDecimal  add     This covers cases where the some or all of the objects in the list is null

[java] Addition for BigDecimal

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