英文:
after decimal why twoo zeros not consider in double
问题
private static DecimalFormat df = new DecimalFormat("0.00");public static void main(String[] args) {double input = 300.00;System.out.println("double : " + input);Double d = Double.valueOf(df.format(input));System.out.println("##1::" + d);System.out.println("##2 ::" + df.format(input));System.out.println("##3 ::" + Double.valueOf(df.format(input)));}}
Output:
double : 300.0##1::300.0##2 ::300.00##3 ::300.0
英文:
private static DecimalFormat df = new DecimalFormat("0.00");public static void main(String[] args) {double input = 300.00;System.out.println("double : " + input);Double d=Double.valueOf(df.format(input));System.out.println("##1::"+d);System.out.println("##2 ::"+df.format(input));System.out.println("##3 ::"+Double.valueOf(df.format(input)));}}
Output:
double : 300.0##1::300.0##2 ::300.00##3 ::300.0
Expected output: 300.00
答案1
得分: 2
你可以使用BigDecimal来进行精度控制和四舍五入的操作。尝试以下代码：
import java.math.BigDecimal;import java.math.RoundingMode;public class Test {public static void main(String[] args) {BigDecimal input = BigDecimal.valueOf(300);System.out.println("double 2 digit: " + Test.round(input, 2));System.out.println("double 5 digit: " + Test.round(input, 5));}public static BigDecimal round(BigDecimal bd, int scale) {return bd.setScale(scale, RoundingMode.HALF_UP);}}
输出如下：
double 2 digit: 300.00double 5 digit: 300.00000
英文:
You can use BigDecimal for scale and round double. Try this :
import java.math.BigDecimal;import java.math.RoundingMode;public class Test {public static void main(String[] args) {BigDecimal input = BigDecimal.valueOf(300);System.out.println("double 2 digit: " + Test.round(input, 2));System.out.println("double 5 digit: " + Test.round(input, 5));}public static BigDecimal round(BigDecimal bd, int scale) {return bd.setScale(scale, RoundingMode.HALF_UP);}}
Output like this :
double 2 digit: 300.00double 5 digit: 300.00000
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