Java string format locale

What is the String.format() method in Java?

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The Java String.format() method returns the formatted string by a given locale, format, and argument.

If the locale is not specified in the String.format() method, it uses the default locale by calling the Locale.getDefault() method.

Types of String.Format()

There are two types of String.format() methods:

1. public static String format(Locale loc, String form, Object… args) 2. public static String format(String form, Object… args) 

Parameters

• loc : locale value to be applied on the format() method.
• form : format of the output string.
• args : specifies the number of arguments for the format string. It may be zero or more.

There is a format specifier used in the format() method that identifies the format of the return value.

Format specifiers

Code

The following code displays the output of the String.format() with a locale:

import java.util.Formatter;
import java.util.Locale;
class example  
public static void main(String[] args)  
// create a new formatter
 
StringBuffer buffer = new StringBuffer();
 
Formatter formatter = new Formatter(buffer, Locale.US);
 
// format a new string
 
String name = "Educative";
 
formatter.format(Locale.US,"My company's name is %s !"
 
, name);
 
// print the formatted string with specified locale
 
System.out.println("" + formatter + " "
 
+ formatter.locale());
 
>
>

The following code displays the output of the String.format() by concatenating two strings:

class example  
public static void main(String args[])
 
 
String str = "Educative";
 
// Concatenation of two strings
 
String s= String.format("My Company name is %s", str);
 
System.out.println(s);
 
>
 
>
 

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Java.lang.String.format() Method

The java.lang.String.format(Locale l, String format, Object. args) method returns a formatted string using the specified locale, format string, and arguments.

Declaration

Following is the declaration for java.lang.String.format() method

public static String format(Locale l, String format, Object. args)

Parameters

• l − This is the locale to apply during formatting. If l is null then no localization is applied.
• format − This is a format string.
• args − This is the argument referenced by the format specifiers in the format string. If there are more arguments than format specifiers, the extra arguments are ignored. The number of arguments is variable and may be zero.

Return Value

This method returns a formatted string.

Exception

• 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.
• NullPointerException − If the format is null.

Example

The following example shows the usage of java.lang.String.format() method.

package com.tutorialspoint; import java.lang.*; public class StringDemo < public static void main(String[] args) < double piVal = Math.PI; /* returns a formatted string using the specified format string, and arguments */ System.out.format("%f\n", piVal); /* returns a formatted string using the specified locale, format string and arguments */ System.out.format(Locale.US, "%10.2f", piVal); >>

Let us compile and run the above program, this will produce the following result −

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