How to multiply a BigDecimal by an integer in Java

Question

How do you multiply a BigDecimal by an integer in Java  I tried this but its not correct   import java math BigDecimal  import java math MathContext   public class Payment       int itemCost      int totalCost   0       public BigDecimal calculateCost int itemQuantity BigDecimal itemPrice           itemCost   itemPrice multiply itemQuantity           totalCost   totalCost   itemCost      return totalCost

User · Answer

First off  BigDecimal multiply   returns a BigDecimal and you re trying to store that in an int   Second  it takes another BigDecimal as the argument  not an int   If you just use the BigDecimal for all variables involved in these calculations  it should work fine

User · Answer

You have a lot of type-mismatches in your code such as trying to put an int value where BigDecimal is required  The corrected version of your code   public class Payment       BigDecimal itemCost    BigDecimal ZERO      BigDecimal totalCost   BigDecimal ZERO       public BigDecimal calculateCost int itemQuantity  BigDecimal itemPrice                itemCost    itemPrice multiply new BigDecimal itemQuantity            totalCost   totalCost add itemCost           return totalCost

User · Answer

If I were you  I would set the scale of the BigDecimal so that I dont end up on lengthy numbers   The integer 2 in the BigDecimal initialization below sets the scale    Since you have lots of mismatch of data type  I have changed it accordingly to adjust        class Payment            BigDecimal itemCost new BigDecimal BigInteger ZERO   2         BigDecimal totalCost new BigDecimal BigInteger ZERO   2         public BigDecimal calculateCost int itemQuantity BigDecimal itemPrice                       BigDecimal   itemCost   itemPrice multiply new BigDecimal itemQuantity                  return totalCost add itemCost                   BigDecimals are Object   not primitives  so make sure you initialize itemCost and totalCost   otherwise it can give you nullpointer while you try to add on totalCost or itemCost

[java] How to multiply a BigDecimal by an integer in Java

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