PrintStream printf(String, Object) method in Java with Examples

Last Updated : 31 Jan, 2019

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

Syntax:

public PrintStream printf(String format, Object…args)

Parameters: This method accepts two mandatory parameter:

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 PrintStream 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 printf(String, Object) method:

Program 1:

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

Output:

GeeksForGeeks 47.65734000

Program 2:

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

Output:

A Computer Science Portal  GFG, GFG and GeeksforGeeks

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Kirti_Mangal

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PrintStream printf(String, Object) method in Java with Examples

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