如何在Java中将有理数转换为具有特定小数位数的字符串？

import java.math.BigDecimal;

BigDecimal rationalNumber = new BigDecimal("3.14159");

int decimalPlaces = 2; // 设置小数位数为2
BigDecimal result = rationalNumber.setScale(decimalPlaces, BigDecimal.ROUND_HALF_UP);

String resultString = result.toString();

import java.math.BigDecimal;

public class RationalNumberConversion {
    public static void main(String[] args) {
        BigDecimal rationalNumber = new BigDecimal("3.14159");
        int decimalPlaces = 2; // 设置小数位数为2
        BigDecimal result = rationalNumber.setScale(decimalPlaces, BigDecimal.ROUND_HALF_UP);
        String resultString = result.toString();
        System.out.println(resultString);
    }
}