how do you round a double to 2 decimal places in java

1. DecimalFormat (“0.00”) We can use DecimalFormat ("0.00") to ensure the number is round to 2 decimal places. DecimalExample.java
2. String.format (“%.2f”) We also can use String formater %2f to round the double to 2 decimal places. However, we can’t configure the rounding mode in String.format, always rounding half-up.
3. BigDecimal. BigDecimalExample.java ...
4. References. Founder of Mkyong.com, love Java and open source stuff. Follow him on Twitter. If you like my tutorials, consider make a donation to these charities.

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.

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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.

What decimal format to use to round a double?

We can use DecimalFormat("0.00") or BigDecimal to round float / double to 2 decimal places.

What is the default rounding mode in decimal format?

We can use DecimalFormat("0.00")to ensure the number always round to 2 decimal places. For DecimalFormat, the default rounding mode is RoundingMode.HALF_EVEN, and we can use setRoundingMode(RoundingMode) to set a specified rounding mode.

Is Math Round overloaded?

I had the same issue, Math.round method is overloaded and you are getting the long back make sure you pick the method that returns an int.

Can you convert a doubleto a big decimal object?

We also can convert the doubleto a BigDecimalobject and set the scale and rounding mode.

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.

How to round a double to two decimal places?

Round of a double to Two Decimal Places Using Math.round (double*100.0)/100.0

What is the math round method in Java?

The Math.round () method is used in Java to round a given number to its nearest integer. Since in this article, we will learn rounding of a double to 2 decimal places, the application of Math.round () will include (double*100.0)/100.0.

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:

What is BigDecimal BD?

BigDecimal bd = new BigDecimal (val1).setScale (2, RoundingMode.HALF_UP);

What is 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. So, let’s have a look at how it’s used in the following scenario.

Can you round double in Java?

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 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.

What type of decimal is used in Java?

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: double PI = 3.1415; However, we should never use either type for precise values, such as currencies. For that, and also for rounding, we can use the BigDecimal class.

What is double rounding?

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.

When constructing a big decimal, must we always use the constructor?

This prevents issues with representing inexact values.

Can you round a variable without changing the value?

We can simply format the output without changing the value, or we can round the variable by using a helper method. We also discussed a few libraries that deal with this problem.

Is half up rounding the same as helper?

By default, it is using the same HALF_UP rounding method as our helper method; therefore, the results should be the same.