( "Converted BigDecimal to Double: " + doubleObj) Ĭonverted BigDecimal to Double: 3456.78912Ĭonverting BigDecimal to Double with 2 Decimal placesĪfter converting BigDecimal to Double, you can easily restrict the Double to 2 decimal places by using BigDecimal class setScale() method as shown below in the example. How to format decimal output to 2 numbers after the decimal point-1. For most Java versions, you can use DecimalFormat: - DecimalFormat formatter new DecimalFormat('0.00'). Converting BigDecimal to Double using doubleValue() 2 after decimal denotes, number of decimal places after. Creating BigDecimal object using ConstructorīigDecimal bd = new BigDecimal( "3456.78912") You can easily convert BigDecimal to Double in Java using BigDecimal class doubleValue() method as shown below in the example. To do this, you can use the parseFloat function: const string '123.45' const number parseFloat(string) console.log(number) console.log(typeof number) 123. Using BigDecimal class doubleValue() method To parse a string as a float to two decimal places, we first must convert the string into a number. Read Also: Convert BigInteger to BigDecimal in Java Double.parseDouble We can convert a String to a double using the Double.parseDouble method: assertEquals ( 1.23, Double.parseDouble ( '1.23' ), 0.000001 ) 3. We can achieve our goal using BigDecimal class doubleValue() method. Overview In this tutorial, we'll cover many ways of converting a String into a double in Java. * Java program to format float or double to String in Java.In this post, I will be sharing how to convert BigDecimal to Double in Java with examples. Next, create the instance of DecimalFormat class as new DecimalFormat ('0. Most of the time you can use a local instance of DecimalFormat, but if performance is critical for your application then you either need to explicitly synchronize access of this object or use a ThreadLocal variable, which is more efficient, and avoids cost of acquiring and releasing locks. First, convert the string into double using Double.parseDouble () method. You can now decide what to use depending upon whether you need trailing zeros or not. This is a very subtle but useful difference, its easy to forget but pays well when you remember it. println(strDouble) // print 2.00 DecimalFormat df = new DecimalFormat( "#.#") For example if you format 2.00034 up-to two decimal places String's format() method will print "2.00", while format() method of DecimalFormat class will print "2", as shown below : By the way, even DecimalFormat rounds the number if next decimal point is more than 5.īy the way, there is subtle difference between formatting floating point numbers using String.format() and DecimalFormat.format(), former will always print trailing zeros even if there is no fractional part. The string "#.#" indicate that we are formatting up-to 2 decimal points, "#.#" indicates formatting number up-to 3 decimal places. Then, this is the reason why Java is reliable and widely used by a lot of programmers in the world. Here is a quick example of formatting double and float numbers using DecimalFormat class.ĭecimalFormat df = new DecimalFormat( "#.#") In reality, Java is considered one of the fastest and worth-using computing platforms in the global market. This string specifies up-to how many decimal places you want to format the input. While creating instance of DecimalFormat class, you can pass it a formatting string, which is bit different then what you pass to these format method, but I guess its more readable. Alternatively, if you just want to print formatted floating point numbers into console, you can use System.printf() method, which effectively combine above two lines into single one.īut the best method for task is using DecmialFormat class, which is actually designed to format any number in Java be it integer, float or double. println(strDouble) // print 2.00Īs I said before, this is not the only way to format floating point numbers in Java, you can use right from the top Formatter class, which provides format() method similar to String's format() method. For example if you want to format 1.99999 up-to 2 decimal places then it will return 2.0 rather than 1.99, as shown below. Note: Just like String, BigDecimal objects are immutable. Java provides the following three ways to display double in 2 decimal places: Using DecimalFormat ('0.00') Using String.format () Method ('.2f') Using BigDecimal Let's discuss the above ways one by one. By the way there is a catch here, format() method will also arbitrarily round the number. Output: Converted BigDecimal to Double: 3456.78912 Converting BigDecimal to Double with 2 Decimal places After converting BigDecimal to Double, you can easily restrict the Double to 2 decimal places by using BigDecimal class setScale () method as shown below in the example.
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