publicclassDecimalTruncator{publicstaticvoidmain(String[]args){// 步骤2:定义输入doubleinput=123.456789;// 这里可以修改成任意需要截取的小数// 步骤3:截取小数doubletruncatedValue=truncateToThreeDecimalPlaces(input);// 步骤4:输出结果System.out.println("截取后的小数为: "+truncatedValue);}// 方法:截取...
步骤2:保留小数 为了保留3位小数,我们可以使用DecimalFormat类,它可以非常方便地对数字进行格式化。下面是一个实现该功能的方法: importjava.text.DecimalFormat;// 导入DecimalFormat类用于格式化数字publicstaticfloatroundToThreeDecimalPlaces(floatvalue){DecimalFormatdecimalFormat=newDecimalFormat("#.###");// 创建一个...
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. df.applyPattern("#.00"); We specify a new pattern withapplyPattern....
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: doublenum=...
To rounddoubles tondecimal places, we can write ahelper method: private static double round(double value, int places) { if (places < 0) throw new IllegalArgumentException(); BigDecimal bd = new BigDecimal(Double.toString(value)); bd = bd.setScale(places, RoundingMode.HALF_UP); ...
importjava.math.BigDecimal;importjava.math.RoundingMode;publicclassBigDecimalOperationsExtendedWithDecimalPlacesExample{publicstaticvoidmain(String[]args){BigDecimal num1=newBigDecimal("10.5");BigDecimal num2=newBigDecimal("5.3");// 加法 BigDecimal sum = num1.add(num2); // 使用 setScale 方法将加法结果...
1.1.3 Java注释的作用 对程序中的代码进行解释说明 在开发项目时可以先将自己的思路和实现步骤通过注释整理出来,再用代码去实现 在调试项目时可以注释部分可能错误的代码再对程序进行调试 1.2 Java注释的使用 新建包 选中java-core模块的src目录,然后右键New Package ...
Returns a BigDecimal which is equivalent to this one with the decimal point moved n places to the right. Multiply(BigDecimal, MathContext) Returns a BigDecimal whose value is (this × multiplicand), with rounding according to the context settings. Multiply(BigDecimal) Returns a BigDecimal...
When a language has both an alpha-2 code and an alpha-3 code, the alpha-2 code must be used. You can find a full list of valid language codes in the IANA Language Subtag Registry (search for "Type: language"). The language field is case insensitive, but Locale always canonicalizes ...
Returns a BigDecimal which is equivalent to this one with the decimal point moved n places to the right. Multiply(BigDecimal, MathContext) Returns a BigDecimal whose value is (this × multiplicand), with rounding according to the context settings. Multiply(BigDecimal) Returns a BigDecimal...