PrintStream printf(String, Object) method in Java with Examples
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 = "w3wiki %.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:
w3wiki 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 = "w3wiki" ; 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 w3wiki
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