![]() ![]() * Java program to format float or double to String in Java. 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. 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. Here is a quick example of formatting double and float numbers using DecimalFormat class.ĭecimalFormat df = new DecimalFormat( "#.#") 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. This function will take a string and attempt to convert it into a double, returning null if the conversion fails.By the way there is a catch here, format() method will also arbitrarily round the number. The Double class has a companion object which contains a method toDoubleOrNull(). Kotlin’s String class has a method toString() which returns the string representation of the object. Here is an example of how to convert a string to a double with two decimal places:ĭouble d = Double.parseDouble(str) //d will equal 1234.56 Second, if the string cannot be parsed as a Double, an exception will be thrown. First, if the string has more than two decimal places, the extra decimal places will be truncated. When you need to convert a string to a double, there are a few things you need to keep in mind. Java Convert String to Double With 2 Decimal Places How to Check If String Can Be Converted to Double Java?.How to Convert String to Double Without Losing Precision Java?.How to Convert String With Comma to Double in Java?.What is the Method in Converting String to Double?.Java Convert String to Double With 2 Decimal Places.doubleValue () // Unboxes and assigns primitive value 3.14″) // Returns an object with value 3.For instance, we can use this method as follows:.This approach returns a Double object instead of a primitive double value, but it can be unboxed back into a primitive double if needed (using the doubleValue() method).14″, we can use this method as follows:Īnother way to convert a string to a double is by using the static valueOf() method of the Double class.Simply pass in the string that you want to convert and it will return a double data type.This is the most direct way to convert a string to a double value java convert double to string decimal up to 6 places in java java round double to 2 decimals how to set 2 decimal places in java how to use decimal format java java float get 2 decimals decimals java convert double to in in java Java convert double to int java printf double 2 decimal places Display double in decimal places java. The following are the steps to convert String to Double in Java:.Converting String to primitive short using Short. println (“String converted to byte : ” +bnum ) ![]() Converting String to primitive byte using Byte. Converting String to primitive float using Float.parseFloat() method Converting String to primitive int using Integer.parseInt() method In addition, this class provides several methods for converting a double to a String and vice versa, as well as other constants and methods useful when dealing with a double. An object of type Double contains a single field whose type is double. The Double class wraps a value of the primitive type double in an object. ![]()
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