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....
可以使用DecimalFormat类来实现将数值转换为指定小数位数的功能。 publicclassDecimalConverter{publicstaticdoubleconvert(doublenumber){DecimalFormatdf=newDecimalFormat("#0.00");// 创建DecimalFormat对象,指定小数位数为2StringformattedNumber=df.format(number);// 使用DecimalFormat格式化数值returnDouble.parseDouble(formatted...
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 ...
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<>(); map.put("a", decimal);ObjectMapperobjectM...
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)/...
DecimalFormat df = new DecimalFormat(); df.setMaximumFractionDigits(2); System.out.println(df.format(decimalNumber));
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; ...
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: ...
</blockquote> Each of these methods has two variants; one with an explicit locale and one without; the latter uses the default Locale.Category#FORMAT FORMAT locale: <blockquote>text/java 複製 NumberFormat.getInstance(myLocale) NumberFormat.getCurrencyInstance(myLocale) NumberFormat.getPercentInstance(...
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