関連ワード:  java check if bigdecimal is zero    how to check if bigdecimal is zero    java check if bigdecimal is null    java check if bigdecimal is null or empty    how to check if bigdecimal is null    how to check if bigdecimal is null or empty    java check if bigdecimal is null or zero    java check if bigdecimal is greater than zero    java check if bigdecimal is less than zero    java check if bigdecimal equals zero