public static String formatToTwoDecimalPlaces(double number) { return String.format("%.2f", number); } public static void main(String[] args) { double number = 123.456789; String formattedNumber = formatToTwoDecimalPlaces(number); System.out.println(formattedNumber); // 输出 123.46 } } 这种...
importjava.util.regex.Matcher;importjava.util.regex.Pattern;publicclassDecimalFormatter{publicstaticvoidmain(String[]args){Stringinput="123.456";// 输入的测试数字StringformattedNumber=formatToTwoDecimalPlaces(input);// 调用格式化方法System.out.println(formattedNumber);// 输出格式化结果}publicstaticStringfor...
importjava.text.DecimalFormat;publicclassDecimalUtils{publicstaticdoubleroundToTwoDecimalPlaces(doublenumber){DecimalFormatdf=newDecimalFormat("#.00");returnDouble.parseDouble(df.format(number));}} 1. 2. 3. 4. 5. 6. 7. 8. 上面的代码定义了一个DecimalUtils类,其中的roundToTwoDecimalPlaces()方法接...
floatnumber=123.456f;DecimalFormatdf=newDecimalFormat("###.##");System.out.println(df.format(number));//123.46 5. Conclusion This Java tutorial taught us to round off a given floating point number to 2 decimal points using different techniques. We learned to use the Decimal class (recommended...
System.out.println(decimal.toString());//输出:9E-14System.out.println(decimal.toPlainString());//输出: 0.00000000000009System.out.println(decimalFormatNumberOfDecimalPlaces2.format(decimal));//输出:0.00Map<String, Object> map =newjava.util.HashMap<>(); ...
NumberFormat nf3 = NumberFormat.getNumberInstance(deLoc); DecimalFormat df3 = (DecimalFormat)nf3; df3.applyPattern(pattern); System.out.println(df3.format(n)); } In the program, we print a value in three different locales. The grouping and the decimal separators chosen according to the given...
3. Formatting a Decimal Number If we just want to print a decimal number withndigits after the decimal point, we can simply format the output String: System.out.printf("Value with 3 digits after decimal point %.3f %n", PI); // OUTPUTS: Value with 3 digits after decimal point 3.142 ...
numberToBeRounded); For example, you can replace the line containing case 0 with this: case 0: answerTxt.setText ( String.format ("%.2f", (firstNumber * secondNumber) / 2 ) ); break; The %.2f format specifier will display a floating point number rounded to two decimal places. See ...
2. Basic Number Formatting WithString#format 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: ...
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: ...