To round to 2 decimal places in Java, do this: Math.round (number * 100.0) / 100.0. Here's how you do it: double number = 123.456789 ; double rounded = Math.round (number * 100.0) / 100.0 ; System.out.println (rounded); // 123.46
Full Answer
How to make Java round up?
Return
- If the argument is positive or negative number, this method will return the nearest value.
- If the argument is not a number (NaN), this method will return Zero.
- If the argument is positive Infinity or any value less than or equal to the value of Integer.MIN_VALUE, this method will return Integer.MIN_VALUE.
What is round method in Java?
Java math round() is an inbuilt method that is used to calculate the nearest int(or long) value of a float(or double) variable. The round() method comes handy across a large variety of programs wherever such a conversion is needed. The rounded-off value is calculated by adding 0.5 to the passed value and then taking the floor of the result.
What is round in Java?
round() method in Java is used to round a number to its closest integer. This is done by adding 1 / 2 1/2 1/2 to the number, taking the floor of the result, and casting the result to an integer data type.
How to limit decimal places in Java?
In this guide, I will show you how to:
- Round a number with toFixed () method and its caveats.
- Round a number using Math.round () function.
- Create a generic rounding function.
How do you round a double to two decimal places in Java?
There are a few ways to round float or double to 2 decimal places in Java....Java – How to round double / float value to 2 decimal placesDecimalFormat("0.00")DecimalFormat("0.00") vs DecimalFormat("#.##")BigDecimal.String.format("%.2f", input)Math.round.References.
How do you round up a double in Java?
ceil() to Round Up Any Number to int. Math. ceil() takes a double value, which it rounds up.
What is .2f in Java?
printf("%. 2f", val); In short, the %. 2f syntax tells Java to return your variable ( val ) with 2 decimal places ( . 2 ) in decimal representation of a floating-point number ( f ) from the start of the format specifier ( % ).
How do you print double to two decimal places?
we now see that the format specifier "%. 2f" tells the printf method to print a floating point value (the double, x, in this case) with 2 decimal places.
How do you set decimal places in Java?
Using the format() method The first argument specifies the format. "%. 2f" denotes 2 decimal places, "%. 3f" denotes 3 decimal places, and so on.
How do you remove the decimal of a double in Java?
Convert Double to String, Removing Decimal PlacesIntroduction. In this tutorial, we'll take a look at the different ways to convert a double value to a String, removing its decimal places. ... Truncation Using Casting. ... Rounding Using String. ... Using NumberFormat. ... Using DecimalFormat. ... Using BigDecimal. ... Conclusion.
Does .2f round?
2f' means round to two decimal places. This format function returns the formatted string.
How do you round decimals in Java?
round() is used round of the decimal numbers to the nearest value. This method is used to return the closest long to the argument, with ties rounding to positive infinity.
How do you round in Java?
round() method in Java is used to round a number to its closest integer. This is done by adding 1 / 2 1/2 1/2 to the number, taking the floor of the result, and casting the result to an integer data type.
How many decimal places can a double hold Java?
16The number of decimal places in a double is 16.
Using System.out.printf
If you want to print double to 2 decimal places, this is best way to print double to 2 decimals on console. Here is an example:
Using Formatter
You can use java.util.Formatter ‘s format () method to format double to 2 decimal places. This is similar to System.out.printf method. Here is an example:
Using BigDecimal
You can convert double to BigDecimal and use BigDecimal ‘s setScale () method to format double to 2 decimal places You can use RoundingMode to specify rounding behavior. Here is an example:
Using DecimalFormat
DecimalFormat can be used by providing formatting Pattern to format double to 2 decimal places. You can use RoundingMode to specify rounding behavior. Here is an example:
Using NumberFormat
You can also use NumberFormat ‘s setMaximumFractionDigits () to put constraint on number by decimal places and use its format () method to format double to 2 decimal places. Here is an example:
Using Apache common library
You can use Precision ‘s round () method to format double to 2 decimal places. Precision class belongs to Apache common’s common-math3 library. Add the following dependency to pom.xml.
Round of a double to Two Decimal Places Using BigDecimal
In this way, we can first convert double to BigDecimal and then use the setScale () method to round the converted BigDecimal to two decimal places. Let us understand the below example.
Round of a double to Two Decimal Places Using DecimalFormat
We can also round a double value to two decimal places using DecimalFormat. Let us discuss in the following example.
Round of a double to Two Decimal Places Using Apache Common Math
A special kind of math library in Java is used to round a double to two decimal places, which is Apache Common. Let us discuss its utilization in the following example.
How to round doubles in java by utilizing BigDecimal?
We can round the translated BigDecimal to two decimal places by first converting double to BigDecimal and then using the setScale () function. So, in order to know how does this this method work, you should follow the codes below:
How to round doubles in java by making use of DecimalFormat
If you want to round double in Java, DecimalFormat is also the ideal choice. Also, want to know how to use it? So, let’s refer to the following code:
Using Apache Common Math
Coming to the final method of How to round doubles in java that is extremely effective to help you round doubles in Java with ease. Then, it is taking advantage of Apache Common Math. For more details, Apache Common is a specific type of Java math library that is used to round a double to two decimal places.
In conclusion
In short, as you probably, rounding doubles in java to two decimal places isn’t quite difficult. Then, only following one of four methods above, your requirement will be met with ease.
Using BigDecimal
You can convert double or float to BigDecimal and use setScale () method to round double/float to 2 decimal places. Here is the example:
Using Apache common Math
You can also use Apache common ‘s math library to round double or float to 2 decimal places. Add the following dependency to pom.xml.
1. Overview
In this short tutorial, we'll learn how to round a number to n decimal places in Java.
Number of Digits in an Integer in Java
Learn different ways of getting the number of digits in an Integer in Java.
Check If a String Is Numeric in Java
Explore different ways to determine whether a String is numeric or not.
2. Decimal Numbers in Java
Java provides two primitive types that we can use for storing decimal numbers: float and double. Double is the default type:
3. Formatting a Decimal Number
If we just want to print a decimal number with n digits after the decimal point, we can simply format the output String:
5. Rounding Doubles With DoubleRounder
DoubleRounder is a utility in the decimal4j library. It provides a fast and garbage-free method for rounding doubles from 0 to 18 decimal points.
7. Conclusion
In this article, we covered different techniques for rounding numbers to n decimal places.
