How to check if BigDecimal variable 0 in java

Question

I have the following code in Java   BigDecimal price     assigned elsewhere  if  price compareTo new BigDecimal  0 00       0        return true      What is the best way to write the if condition

User · Answer

You would want to use equals   since they are objects  and utilize the built in ZERO instance  if  selectPrice equals BigDecimal ZERO    Note that  equals   takes scale into account  so unless selectPrice is the same scale  0  as  ZERO then this will return false  To take scale out of the equation as it were  if  selectPrice compareTo BigDecimal ZERO     0   I should note that for certain mathematical situations  0 00    0  which is why I imagine  equals   takes the scale into account  0 00 gives precision to the hundredths place  whereas 0 is not that precise  Depending on the situation you may want to stick with  equals

User · Answer

There is a constant that you can check against   someBigDecimal compareTo BigDecimal ZERO     0

User · Answer

Alternatively  I think it is worth mentioning that the behavior of equals and compareTo methods in the class BigDecimal are not consistent with each other  This basically means that  BigDecimal someValue   new BigDecimal  quot 0 00 quot    System out println someValue compareTo BigDecimal ZERO     0      true System out println someValue equals BigDecimal ZERO       false  Therefore  you have to be very careful with the scale in your someValue variable  otherwise you would get unexpected result

User · Answer

Use compareTo BigDecimal ZERO  instead of equals     if  price compareTo BigDecimal ZERO     0     see below   Comparing with the BigDecimal constant BigDecimal ZERO avoids having to construct a new BigDecimal 0  every execution   FYI  BigDecimal also has constants BigDecimal ONE and BigDecimal TEN for your convenience     Note   The reason you can t use BigDecimal equals   is that it takes scale into consideration   new BigDecimal  0   equals BigDecimal ZERO     true new BigDecimal  0 00   equals BigDecimal ZERO     false    so it s unsuitable for a purely numeric comparison  However  BigDecimal compareTo   doesn t consider scale when comparing   new BigDecimal  0   compareTo BigDecimal ZERO     0    true new BigDecimal  0 00   compareTo BigDecimal ZERO     0    true

User · Answer

A simple and better way for your exemple is  BigDecimal price   if BigDecimal ZERO compareTo price     0             Returns TRUE

User · Answer

There is a static constant that represents 0   BigDecimal ZERO equals selectPrice    You should do this instead of   selectPrice equals BigDecimal ZERO    in order to avoid the case where selectPrice is null

User · Answer

Alternatively  signum   can be used   if  price signum      0        return true

User · Answer

BigDecimal ZERO setScale 2  equals new BigDecimal  0 00

User · Answer

I usually use the following   if  selectPrice compareTo BigDecimal ZERO     0

User · Answer

GriffeyDog is definitely correct   Code   BigDecimal myBigDecimal   new BigDecimal  00000000 000000    System out println  bestPriceBigDecimal     myBigDecimal   System out println  BigDecimal valueOf 0 000000      BigDecimal valueOf 0 000000    System out println   equals     myBigDecimal equals BigDecimal ZERO    System out println  compare      0    myBigDecimal compareTo BigDecimal ZERO       Results   myBigDecimal 0 000000 BigDecimal valueOf 0 000000  0 0  equals false compare true   While I understand the advantages of the BigDecimal compare  I would not consider it an intuitive construct  like the      lt       lt       operators are   When you are holding a million things  ok  seven things  in your head  then anything  you can reduce your cognitive load is a good thing  So I built some useful convenience functions   public static boolean equalsZero BigDecimal x        return  0    x compareTo BigDecimal ZERO      public static boolean equals BigDecimal x  BigDecimal y        return  0    x compareTo y      public static boolean lessThan BigDecimal x  BigDecimal y        return  -1    x compareTo y      public static boolean lessThanOrEquals BigDecimal x  BigDecimal y        return  x compareTo y   lt   0     public static boolean greaterThan BigDecimal x  BigDecimal y        return  1    x compareTo y      public static boolean greaterThanOrEquals BigDecimal x  BigDecimal y        return  x compareTo y   gt   0       Here is how to use them       System out println  Starting main Utils        BigDecimal bigDecimal0   new BigDecimal 00000 00       BigDecimal bigDecimal2   new BigDecimal 2       BigDecimal bigDecimal4   new BigDecimal 4         BigDecimal bigDecimal20   new BigDecimal 2 000       System out println  Positive cases         System out println  bigDecimal0     bigDecimal0        zero is     Utils equalsZero bigDecimal0        System out println  bigDecimal2     bigDecimal2      lt   bigDecimal4     bigDecimal4     is     Utils lessThan bigDecimal2  bigDecimal4        System out println  bigDecimal2     bigDecimal2        bigDecimal20     bigDecimal20     is     Utils equals bigDecimal2  bigDecimal20        System out println  bigDecimal2     bigDecimal2      lt   bigDecimal20     bigDecimal20     is     Utils equals bigDecimal2  bigDecimal20        System out println  bigDecimal2     bigDecimal2      lt   bigDecimal4     bigDecimal4     is     Utils lessThanOrEquals bigDecimal2  bigDecimal4        System out println  bigDecimal4     bigDecimal4      gt   bigDecimal2     bigDecimal2     is     Utils greaterThan bigDecimal4  bigDecimal2        System out println  bigDecimal4     bigDecimal4      gt   bigDecimal2     bigDecimal2     is     Utils greaterThanOrEquals bigDecimal4  bigDecimal2        System out println  bigDecimal2     bigDecimal2      gt   bigDecimal20     bigDecimal20     is     Utils greaterThanOrEquals bigDecimal2  bigDecimal20        System out println  Negative cases         System out println  bigDecimal2     bigDecimal2        zero is     Utils equalsZero bigDecimal2        System out println  bigDecimal2     bigDecimal2        bigDecimal4     bigDecimal4     is     Utils equals bigDecimal2  bigDecimal4        System out println  bigDecimal4     bigDecimal4      lt   bigDecimal2     bigDecimal2     is     Utils lessThan bigDecimal4  bigDecimal2        System out println  bigDecimal4     bigDecimal4      lt   bigDecimal2     bigDecimal2     is     Utils lessThanOrEquals bigDecimal4  bigDecimal2        System out println  bigDecimal2     bigDecimal2      gt   bigDecimal4     bigDecimal4     is     Utils greaterThan bigDecimal2  bigDecimal4        System out println  bigDecimal2     bigDecimal2      gt   bigDecimal4     bigDecimal4     is     Utils greaterThanOrEquals bigDecimal2  bigDecimal4      The results look like this   Positive cases  bigDecimal0 0    zero is true bigDecimal2 2  lt   bigDecimal4 4 is true bigDecimal2 2    bigDecimal20 2 is true bigDecimal2 2  lt   bigDecimal20 2 is true bigDecimal2 2  lt   bigDecimal4 4 is true bigDecimal4 4  gt   bigDecimal2 2 is true bigDecimal4 4  gt   bigDecimal2 2 is true bigDecimal2 2  gt   bigDecimal20 2 is true Negative cases  bigDecimal2 2    zero is false bigDecimal2 2    bigDecimal4 4 is false bigDecimal4 4  lt   bigDecimal2 2 is false bigDecimal4 4  lt   bigDecimal2 2 is false bigDecimal2 2  gt   bigDecimal4 4 is false bigDecimal2 2  gt   bigDecimal4 4 is false

User · Answer

Just want to share here some helpful extensions for kotlin  fun BigDecimal isZero     compareTo BigDecimal ZERO     0 fun BigDecimal isOne     compareTo BigDecimal ONE     0 fun BigDecimal isTen     compareTo BigDecimal TEN     0

[java] How to check if BigDecimal variable == 0 in java?

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