How to use comparison operators like on BigDecimal

Question

I have a domain class with unitPrice set as BigDecimal data type  Now I am trying to create a method to compare price but it seems like I can t have comparison operators in BigDecimal data type  Do I have to change data type or is there other way around

User · Answer

Use the compareTo method of BigDecimal       public int compareTo BigDecimal val  Compares this BigDecimal with the   specified BigDecimal    Returns  -1  0  or 1 as this BigDecimal is numerically less than  equal to  or greater than val

User · Answer

This thread has plenty of answers stating that the BigDecimal compareTo BigDecimal  method is the one to use to compare BigDecimal instances  I just wanted to add for anymore not experienced with using the BigDecimal compareTo BigDecimal  method to be careful with how you are creating your BigDecimal instances  So  for example      new BigDecimal 0 8  will create a BigDecimal instance with a value which is not exactly 0 8 and which has a scale of 50   new BigDecimal  0 8   will create a BigDecimal instance with a value which is exactly 0 8 and which has a scale of 1       and the two will be deemed to be unequal according to the BigDecimal compareTo BigDecimal  method because their values are unequal when the scale is not limited to a few decimal places   First of all  be careful to create your BigDecimal instances with the BigDecimal String val  constructor or the BigDecimal valueOf double val  method rather than the BigDecimal double val  constructor  Secondly  note that you can limit the scale of BigDecimal instances prior to comparing them by means of the BigDecimal setScale int newScale  RoundingMode roundingMode  method

User · Answer

Using com ibm etools marshall util BigDecimalRange util class of IBM one can compare if BigDecimal in range   boolean isCalculatedSumInRange   BigDecimalRange isInRange low  high  calculatedSum

User · Answer

Every object of the Class BigDecimal has a method compareTo you can use to compare it to another BigDecimal  The result of compareTo is then compared  gt  0     0 or  lt  0 depending on what you need  Read the documentation and you will find out   The operators      lt    gt  and so on can only be used on primitive data types like int  long  double or their wrapper classes like Integerand Double   From the documentation of compareTo      Compares this BigDecimal with the specified BigDecimal        Two BigDecimal   objects that are equal in value but have a different scale  like 2 0   and 2 00  are considered equal by this method  This method is provided   in preference to individual methods for each of the six boolean   comparison operators   lt                   lt     The suggested idiom for   performing these comparisons is   x compareTo y   lt op gt  0   where  lt op gt    is one of the six comparison operators       Returns    -1  0  or 1 as this BigDecimal is numerically less than  equal to  or greater than val

User · Answer

You can use method named compareTo  x compareTo y   It will return 0 if x and y are equal  1 if x is greater than y and -1 if x is smaller than y

User · Answer

Here is an example for all six boolean comparison operators   lt                   lt       BigDecimal big10   new BigDecimal 10   BigDecimal big20   new BigDecimal 20    System out println big10 compareTo big20   lt  -1       false System out println big10 compareTo big20   lt   -1      true System out println big10 compareTo big20     -1      true System out println big10 compareTo big20   gt   -1      true System out println big10 compareTo big20   gt  -1       false System out println big10 compareTo big20     -1      false  System out println big10 compareTo big20   lt  0        true System out println big10 compareTo big20   lt   0       true System out println big10 compareTo big20     0       false System out println big10 compareTo big20   gt   0       false System out println big10 compareTo big20   gt  0        false System out println big10 compareTo big20     0       true  System out println big10 compareTo big20   lt  1        true System out println big10 compareTo big20   lt   1       true System out println big10 compareTo big20     1       false System out println big10 compareTo big20   gt   1       false System out println big10 compareTo big20   gt  1        false System out println big10 compareTo big20     1       true

User · Answer

BigDecimal isn t a primitive  so you cannot use the  lt    gt  operators  However  since it s a Comparable  you can use the compareTo BigDecimal  to the same effect  E g    public class Domain       private BigDecimal unitPrice       public boolean isCheaperThan BigDecimal other            return unitPirce compareTo other unitPrice   lt  0                etc

User · Answer

To be short    firstBigDecimal compareTo secondBigDecimal   lt  0      lt   firstBigDecimal compareTo secondBigDecimal   gt  0      gt       firstBigDecimal compareTo secondBigDecimal     0           firstBigDecimal compareTo secondBigDecimal   gt   0      gt

[java] How to use comparison operators like >, =, < on BigDecimal

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