PrintWriter format(Locale, String, Object) method in Java with Examples

Last Updated : 31 Jan, 2019

The format(Locale, String, Object) method of PrintWriter Class in Java is used to print a formatted string in the stream using the given Locale. The string is formatted using specified format and arguments passed as the parameter.

Syntax:

public PrintWriter format(Locale locale, String format, Object…args)

Parameters: This method accepts two mandatory parameter:

locale which is the locale value to be applied on the this method
format which is the format according to which the String is to be formatted.
args which is the number of arguments for the formatted string. It can be optional, i.e. no arguments or any number of arguments according to the format.

Return Value: This method returns this PrintWriter instance.

Exception: This method throws following exceptions:

NullPointerException This is thrown if the format is null.
IllegalFormatException This is thrown if the format specified is illegal or there are insufficient arguments.

Below methods illustrates the working of format(Locale, String, Object) method:

Program 1:

// Java program to demonstrate
// PrintWriter format(String, Object) method
  
import java.io.*;
import java.util.*;
  
class GFG {
    public static void main(String[] args)
    {
  
        try {
  
            // Get the parameters
            Locale locale = Locale.getDefault();
  
            double arg = 47.65734;
  
            String format = "GeeksForGeeks %.8f";
  
            // Create a PrintWriter instance
            PrintWriter writer
                = new PrintWriter(System.out);
  
            // print the formatted string
            // to this writer using format() method
            writer.format(format, arg);
  
            writer.flush();
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

Output:

GeeksForGeeks 47.65734000

Program 2:

// Java program to demonstrate
// PrintWriter format(String, Object) method
  
import java.io.*;
import java.util.*;
  
class GFG {
    public static void main(String[] args)
    {
  
        try {
  
            // Get the parameters
            Locale locale = Locale.getDefault();
  
            String arg1 = "GFG";
            String arg2 = "GeeksforGeeks";
  
            String format = "A Computer Science "
                            + "Portal  %1$s, %1$s and %2$s";
  
            // Create a PrintWriter instance
            PrintWriter writer
                = new PrintWriter(System.out);
  
            // print the formatted string
            // to this writer using format() method
            writer.format(format, arg1, arg2);
  
            writer.flush();
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

Output:

A Computer Science Portal  GFG, GFG and GeeksforGeeks

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PrintWriter format(Locale, String, Object) method in Java with Examples