BigDecimal使用

import java.math.BigDecimal;
import java.util.Objects;

public class DecimalTest {
    public static void main(String[] args) {
        BigDecimal dealPrice = new BigDecimal(1);
        BigDecimal dealBuildingArea = new BigDecimal(3);
        if (!Objects.isNull(dealPrice) && !Objects.isNull(dealBuildingArea)) {
            BigDecimal dealUnitPrice =
                    divideMethod(dealPrice, dealBuildingArea).setScale(2, BigDecimal.ROUND_HALF_UP);
            System.out.println(dealUnitPrice);
        }
    }

    private static BigDecimal divideMethod(BigDecimal obj1, BigDecimal obj2){
        if(null==obj1 || null==obj2 || obj2.compareTo(BigDecimal.ZERO)==0){
            return BigDecimal.ZERO;
        }
        return obj1.divide(obj2,2,BigDecimal.ROUND_HALF_UP);
    }
}

以上代码能正常执行且达到预期目的。

如果return obj1.divide(obj2,2,BigDecimal.ROUND_HALF_UP);这一行代码，去掉2,BigDecimal.ROUND_HALF_UP则会报错如下：

Exception in thread "main" java.lang.ArithmeticException: Non-terminating decimal expansion; no exact representable decimal result.
    at java.math.BigDecimal.divide(BigDecimal.java:1690)
    at DecimalTest.divideMethod(DecimalTest.java:19)
    at DecimalTest.main(DecimalTest.java:10)