Java程序保存小数
假设值是0.10705921712947473，而您只想保存前3个十进制数字。首先让我们声明值-
double val = 320.0 / 2989.0; BigDecimal big = new BigDecimal(val);
现在，使用setScale()并将参数设置为3以保存3个小数位-
big = big.setScale(3, RoundingMode.HALF_DOWN);
示例
import java.math.BigDecimal;
import java.math.RoundingMode;
public class Demo {
public static void main(String[] args) {
double val = 320.0 / 2989.0;
BigDecimal big = new BigDecimal(val);
System.out.println(String.format("Value = %s", val));
// scale
big = big.setScale(3, RoundingMode.HALF_DOWN);
double val2 = big.doubleValue();
System.out.println(String.format("Scaled result = %s", val2));
}
}输出结果
Value = 0.10705921712947473 Scaled result = 0.107