public static void main(String[] args) { double number = 123.456789; int decimalPlaces = 2; String formattedString = String.format("%.2f", number); System.out.println(formattedString); } } 在上述代码中,%.2f是一个格式说明符,其中.后的2表示小数点后要显示的位数。所以"%.2f"将数字number格...
String.Format("{0:#.#}", 0.0); // "" 1. 2. 3. 4. 用空格对齐数字 右对齐:在”,“后不变。其次是数量的空格,例如类型逗号“0,10:0.0”(可以使用String.Format方法,在double.ToString方法不是)。左对齐:在”,“后,用"-" [C#] String.Format("{0,10:0.0}", 123.4567); // " 123.5" Str...
public static double TwoDecimalPlaces(double number) { BigDecimal b = new BigDecimal(Double.toString(number)); return b.setScale(2,BigDecimal.ROUND_HALF_UP).doubleValue(); } 1. 2. 3. 4. 5. 最后,我还是跟API说的一样,将double转换为String之后在构造BigDecimal函数,这样就应该没错了吧。(由于错...
Java中取两位小数 请参考下面函数: publicstaticString round2DecimalPlaces(doubled){ java.text.DecimalFormat df=newjava.text.DecimalFormat("#0.00");returndf.format(d); } 输出: Ticket price=108.00Ticket price=54.00Ticket price=34.20Ticket price=35.64...
使用String.format () 方法,它可以按照指定的格式化字符串来输出数值,比如 “%.1f” 表示保留一位小数。例如: doublenum=3.14159;Stringresult=String.format ("%.1f", num);// result = "3.1" 复制 使用DecimalFormat 类,它可以按照指定的模式来格式化数值,比如 “#.#” 表示保留一位小数。例如: ...
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. ...
虽然String.format()方法主要用于格式化字符串,但它也可以用于四舍五入浮点数到指定的小数位数。该方法不直接改变数字,而是将其格式化为包含指定小数位数的字符串。 java double num = 3.14159; String roundedNumStr = String.format("%.2f", num); double roundedNum = Double.parseDouble(roundedNumStr); //...
TheString#formatmethod is very useful for formatting numbers. The method takes two arguments. The first argument describes the pattern of how many decimals places we want to see, and the second argument is the given value: doublevalue=4.2352989244d; assertThat(String.format("%.2f", value))....
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)/...
importjava.text.DecimalFormat;publicclassDecimalUtil{publicstaticdoubleformatTwoDecimalPlaces(doublenumber){doublemultipliedNumber=number*100;doubleflooredNumber=Math.floor(multipliedNumber);doublefinalResult=flooredNumber/100;returnfinalResult;}publicstaticvoidmain(String[]args){doublenumber=3.1415926;doubleresult=...