publicstaticdoubledivide(doublea,doubleb){returna/b;} 1. 2. 3. 6. 添加四舍五入方法 除了基本的算术运算,我们还可以添加一个四舍五入方法,用于对浮点数进行精确的四舍五入操作。 publicstaticdoubleround(doublevalue,intdecimalPlaces){BigDecimalbd=newBigDecimal(Double.toString(value));bd=bd.setScale(d...
>objClass=obj.getClass();for(Fieldfield:objClass.getDeclaredFields()){if(field.isAnnotationPresent(TwoDecimalPlaces.class)){// 处理字段field.setAccessible(true);try{doublevalue=field.getDouble(obj);doubleroundedValue=Math.round(value*100.0)/100.0;field.set(obj,roundedValue);}catch(IllegalAccessExc...
如果你想保持更精确，不要转换为float，如果可能的话也避免使用double。您可以通过将doubleValue直接转换...
How can I use NumberFormat to format a double value for a given Locale (default locale is sufficient) and for a given number of decimal places? For example, I have these values: double d1 = 123456.78; double d2 = 567890; And I want to print them in the following way,...
new Double("12.00") will create a Double with a value of 12d, and doubleValue() will simply return primitive double value 12d. Furthermore, using .## means that the value will be rounded off to 2 decimal places, but if you have a value with less than 2 decimal places, it will not...
How to set double precision to 2 decimal places? A double in Java is a 64-bit number, and the 64-bit precision of a double never changes within a Java program. However, to format the output of a double to two decimal places, simplyuse theprintfmethodand%.2fas the specifier. ...
doubler=5.1234;System.out.println(r);// r is 5.1234intdecimalPlaces=2;BigDecimalbd=newBigDecimal(r);// setScale is immutablebd=bd.setScale(decimalPlaces,BigDecimal.ROUND_HALF_UP);r=bd.doubleValue();System.out.println(r);// r is 5.12 ...
double占据八个字节(byte),也就是64位(bit) FloatLimits.java演示Java两种浮点类型的表示范围和占据内存字节数 package net.ittimeline.java.core.foundational.syntax.variable.type.primitive; /** * Java两种浮点类型的表示范围和占据内存字节数 * * @author tony 18601767221@163.com * @version 2023/7/10 9...
doubler=5.1234;System.out.println(r);// r is 5.1234intdecimalPlaces=2;BigDecimalbd=newBigDecimal(r);// setScale is immutablebd=bd.setScale(decimalPlaces,BigDecimal.ROUND_HALF_UP);r=bd.doubleValue();System.out.println(r);// r is 5.12 ...
System.out.println("Double Number: "+ num); BigDecimal bd =newBigDecimal(num).setScale(2, RoundingMode.HALF_UP); doublenewNum = bd.doubleValue(); System.out.println("Up to two decimal places: "+ newNum); } } Output: Double Number: 12.4565652239 Up to two decimal places: 12.46 ...