Format String In Java

In this article, we will learn about the format string in java method with the help of examples.

Table of Contents

Format String in Java

The format string in java method returns the formatted string by given format and arguments.

The format string method of java language is like sprintf() function in c language and printf() method of java language.

Internal implementation

public static String format(String format, Object… args) {

return new Formatter().format(format, args).toString();

}

Format String in Java Syntax

There are two type of string format() method:

Parameters

format : format of the string.

args : arguments for the format string. It may be zero or more.

Returns

formatted string

Throws

NullPointerException : if format is null.

IllegalFormatException : if format is illegal or incompatible.

Here, we are providing a format specifiers supported by the Java String.

Format Specifier	Data Type	Output
%a	floating point	Returns Hex output of floating point number.
%b	Any type	“true” if non-null, “false” if null
%c	character	Unicode character
%d	integer	Decimal Integer
%e	floating point	decimal number in scientific notation
%f	floating point	decimal number
%g	floating point	decimal number, possibly in scientific notation depending on precision & value.
%h	any type	Hex String of value from hashCode() method.
%n	none	Platform-specific line separator.
%o	integer	Octal number
%s	any type	String value
%t	Date/Time	%t is prefix for Date/Time conversions.
%x	integer	Hex String