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PrintStream format(String, Object) method in Java with Examples
  • Last Updated : 31 Jan, 2019
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The format(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 format(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 format(String, Object) method:

Program 1:




// Java program to demonstrate
// PrintStream format(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 format() method
            stream.format(format, arg);
  
            stream.flush();
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}
Output:
GeeksForGeeks 47.65734000

Program 2:




// Java program to demonstrate
// PrintStream format(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 format() method
            stream.format(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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