[daily record] - bug encountered in BigDecimal division operation

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  Recently in the project test environment , Meet such a problem ; Check the log , The error information is as follows ：

Exception in thread "main" java.lang.ArithmeticException: Non-terminating decimal expansion; no exact representable decimal result.
at java.math.BigDecimal.divide(BigDecimal.java:1693)

Find... By positioning ： Is used in code BigDecimal Of divide Method . 

The inspection found that ： This is because in the BigDecimal There is no error to divide the report , So we need to go to divide The function passes in parameter settings to keep several decimal places .

Problem reduction

Here is a test code to demonstrate the scenario without division .

BigDecimal a = new BigDecimal(1);
BigDecimal b = new BigDecimal(3);
BigDecimal result = a.divide(b);
System.out.println("result = " + result);

 

Treatment method

We treat it divide Method , Set the number of decimal places passed in by the parameter , And the specific rounding mode .

BigDecimal result = a.divide(b,2,BigDecimal.ROUND_HALF_UP); //  Keep two decimal places 、 rounding 

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