Just guess what will happen if invalid format is passed. Java String format() - When IllegalFormatException will be thrown:Įxample Program to see how IllegalFormatException will be thrown and what is the scenario.įor the format method crucial is format that we declare whether it is %s, %S, %f or any valid format. Observe the output always has 10 digits even though input is not having 10 digits in it.įormatted Number value 1: Number 0000012345įormatted Number value 2: Number 0000000999įormatted Number value 3: Number 0007777777 ("Formatted Number value 3: " + value3) Output: String value2 = String.format("Number %010d", 999) This also can be achieved using format method.
#Java formatter how to
In this program, We will see how to make always a number to 10 digits if number is having 9 digits or below. Java String format() : Example program to make a number to 10 digits always: See the uppercase text in the output.įormatted String value: Welcome to the famous JAVA-W3SCHOOLS Blog
#Java formatter code
The above code produces the below output. String value = String.format("Welcome to the famous %S Blog", blogName) Converting to uppercase is done using '%S'. Java String format() : Converting a String to Uppercase Example program to convert a lowercase String to Uppercase using format Method. Output: The above program produces the below output.įormatted String value: Welcome to the famous Java-W3schools blog with worth $15000.990234 String value = String.format("Welcome to the famous %S with worth $%5f", blogName, worth) We can pass String, Float values at once to the format method. Java String format() Method Example with multiple arguments:Įxample Program to format the string with multiple string arguments. String formatted value: String methods on website Java-W3schools blogįloat formatted string value: String methods on website 12.3450009 The above program produces the below output. ("Float formatted string value: " + format2)
String format2 = String.format("String methods on website %f9 ", 12.345f) String format1 = String.format("String methods on website %s ", blogName) The locale always used is the one returned by Locale.getDefault(Locale.Category) with FORMAT category specified. Java String format() Method Example Program to format the string in different specified formats such as String, Numeric, Additional spaces. For specification of all possible formatting errors, see the Details section of the formatter class specification. Java String format() Throws: IllegalFormatException - If a format string contains an illegal syntax, a format specifier that is incompatible with the given arguments, insufficient arguments given the format string, or other illegal conditions. Java String format() Returns: A formatted string Limited formatting customization for arbitrary user types is provided through the Formattable interface. Common Java types such as byte, BigDecimal, and Calendar are supported. This class provides support for layout justification and alignment, common formats for numeric, string, and date/time data, and locale-specific output. If l is null then no localization is applied.įormatter: Formatter is an interpreter for printf-style format strings. L - The locale to apply during formatting.
The behaviour of a null argument depends on the conversion. The maximum number of arguments is limited by the maximum dimension of a Java array as defined by The Java™ Virtual Machine Specification. The number of arguments is variable and may be zero. If there are more arguments than format specifiers, the extra arguments are ignored. args)Īrgs - Arguments referenced by the format specifiers in the format string. Public static String format(Locale l, String format, Object. Takes passed locale instead of default locale value
Public static String format(String format, Object. Java String format() method Syntax: // Takes default locale
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