public class FormatDecimalExample { public static void main(String[] args) { double number = 123.456789; BigDecimal bd = new BigDecimal(number).setScale(2, RoundingMode.HALF_UP); System.out.println("Formatted with BigDecimal: " + bd); } } 运行结果: Formatted with BigDecimal: 123.46 说明: s...
importjava.text.DecimalFormat;publicclassDecimalWithTwoPlaces{publicstaticvoidmain(String[]args){doublenumber=1234567.8;// 包括小数位的格式DecimalFormatdecimalFormat=newDecimalFormat("#,##0.00");StringformattedNumber=decimalFormat.format(number);System.out.println("格式化后的数字(带两位小数): "+formattedNumbe...
We’ll start with a new instance ofBigDecimalwith our original decimal value. Then,by setting the scale, we’ll provide the number of decimal places we want, and how we want to round our number. Using this method allows us to easily format adoublevalue: doubleD=4.2352989244d; assertThat(w...
BigDecimalUtil+BigDecimal number+String toString()+String formatToTwoDecimalPlaces()+String formatWithPattern(String pattern) 4.2 类实现 以下是BigDecimalUtil类的实现示例: importjava.math.BigDecimal;importjava.text.DecimalFormat;publicclassBigDecimalUtil{privateBigDecimalnumber;publicBigDecimalUtil(StringnumStr){t...
The program formats a double value in two formats. var df = new DecimalFormat("#.##"); We create a new instance of theDecimalFormat. We pass it a non-localized pattern string. The pattern defines a format for a decimal value with a dot followed by two decimal places. ...
System.out.println("formatting Numeric part : num = "+ ft.format(num));// formatting money in dollarsdoubleincome =23456.789; ft =newDecimalFormat("$###,###.##"); System.out.println("your Formatted Dream Income : "+ ft.format(income)); ...
Learn toround off numeric values (floats and doubles) to 2 decimal places in Java. Note that we can use the given solutions to round off to any number of places according to requirements. Quick Reference doublenumber=4.56789; // 1. Using Math.round()doublerounded=Math.round(number*100.0)/...
DecimalFormatallows us to explicitly set rounding behavior, giving more control of the output than theString.format()used above. 4. RoundingDoubles WithBigDecimal To rounddoubles tondecimal places, we can write ahelper method: private static double round(double value, int places) { ...
读一个浮点数:double t = sc.nextDouble(); 相当于 scanf(“%lf”, &t); 或 cin >> t; 读一整行: String s = sc.nextLine(); 相当于 gets(s); 或 cin.getline(…); 判断是否有下一个输入可以用sc.hasNext()或sc.hasNextInt()或sc.hasNextDouble()或sc.hasNextLine() 例1:读入整数 代码...
The following program shows some of the formatting that you can do withformat. The output is shown within double quotes in the embedded comment: import java.util.Calendar; import java.util.Locale; public class TestFormat { public static void main(String[] args) { ...