public static void main(String[m.shuozhou.ctsxian.com] args) { double number = 123.456789; System.out.printf("Formatted to two decimal places: %.2f%n", number); } } 运行结果: Formatted to two decimal places: 123.46 说明: %.2f 表示格式化为浮点数并保留两位小数。 方法2:使用 String.forma...
publicclassMathRoundExample{publicstaticdoubleroundToTwoDecimalPlaces(doublenumber){returnMath.round(number*100)/100.0;}publicstaticvoidmain(String[]args){doublenumber=3.14159;System.out.println("保留两位小数四舍五入后的结果:"+roundToTwoDecimalPlaces(number));}} 1. 2. 3. 4. 5. 6. 7. 8. 9....
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...
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. df.applyPattern("#.00"); We specify a new pattern withapplyPattern. This pattern adds zeros to decimal place...
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<>(); ...
System.out.println("Without fraction part: num = "+ ft.format(num));// this will print it upto 2 decimal placesft =newDecimalFormat("#.##"); System.out.println("Formatted to Give precision: num = "+ ft.format(num));// automatically appends zero to the rightmost part// of decimal...
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: ...
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...
2. 输出 函数: System.out.print(); System.out.println(); System.out.format(); System.out.printf(); 例4 杭电1170Balloon Comes! Give you an operator (+,-,*, / –denoting addition, subtraction, multiplication, division respectively) and two positive integers, your task is to output ...
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) { ...