1. 创建一个DoubleUtils类 publicclassDoubleUtils{} 1. 2. 3. 2. 编写方法,实现对double类型数字的位数限制 publicstaticdoubleformatDouble(doublenum,intdecimalPlaces){BigDecimalbd=newBigDecimal(num);bd=bd.setScale(decimalPlaces,RoundingMode.HALF_UP);// 四舍五入,保留指定位数的小数returnbd.doubleValue(...
Sample Input456.967.790.512.8556.967.790.512.8importjava.util.Scanner;publicclassMain{publicstaticvoidmain(String[]args){Scanner sc=newScanner(System.in);while(sc.hasNext()){int n=sc.nextInt();for(int i=0;i<n;i++){double a=sc.nextDouble();。。。}}} 例3:读入字符串【杭电2017 字符串统...
格式2:Scanner sc = new Scanner (System.in); 在读入数据量大的情况下,格式1的速度会快些。 读一个整数:int n =sc.nextInt();相当于scanf("%d", &n);或cin >> n; 读一个字符串:String s =sc.next();相当于scanf("%s", s);或cin >> s; 读一个浮点数:double t =sc.nextDouble();相当...
Rounding bigdecimal to 2 decimal places Check BigDecimal contains Zero or not Convert BigInteger to/from ByteArray #How to Convert BigDecimal to Double in Java TheBigDecimalclass in Java provides a method named doubleValue for convertingBigDecimalto adoublevalue. Depending on the magnitude of the Big...
importjava.text.DecimalFormat;publicclassDecimalFormatExample{publicstaticvoidmain(String[]args){doublenumber=123.456789;DecimalFormatdf=newDecimalFormat("#0.000");StringformattedNumber=df.format(number);System.out.println("Formatted number with three decimal places: "+formattedNumber);}} ...
We specify a new pattern withapplyPattern. This pattern adds zeros to decimal places, if they are empty. Grouping digits The,format character is used for grouping of digits. Main.java import java.text.DecimalFormat; void main() { double n = 2_125_405.30; ...
This example round the bigdecimal value to the nearest integer value. It can be done in two ways, One way is usingsetScale, second-way using theroundmethod. For example, if the given value is 789123.123456789, the output is 789123. ...
BigDecimal(double val) Translates a double into a BigDecimal which is the exact decimal representation of the double's binary floating-point value. BigDecimal(double val, MathContext mc) Translates a double into a BigDecimal, with rounding according to the context settings. BigDecimal...
10.3 Ten characters in width, right justified, with three places after decimal point. The following program shows some of the formatting that you can do with format. The output is shown within double quotes in the embedded comment: import java.util.Calendar; import java.util.Locale; public cla...
Translates a double into a BigDecimal, with rounding according to the context settings. BigDecimal(Double) Translates a double into a BigDecimal which is the exact decimal representation of the double's binary floating-point value. BigDecimal(Int32, MathContext) Translates an int into a BigDecima...