PrintWriter printf(String, Object) method in Java with Examples
The printf(String, Object) method of PrintWriter 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 PrintWriter 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 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 printf(String, Object) method:
Program 1:
import java.io.*;
class GFG {
public static void main(String[] args)
{
try {
double arg = 47.65734 ;
String format = "GeeksForGeeks %.8f" ;
PrintWriter writer
= new PrintWriter(System.out);
writer.printf(format, arg);
writer.flush();
}
catch (Exception e) {
System.out.println(e);
}
}
}
|
Output:
GeeksForGeeks 47.65734000
Program 2:
import java.io.*;
class GFG {
public static void main(String[] args)
{
try {
String arg1 = "GFG" ;
String arg2 = "GeeksforGeeks" ;
String format = "A Computer Science "
+ "Portal %1$s, %1$s and %2$s" ;
PrintWriter writer
= new PrintWriter(System.out);
writer.printf(format, arg1, arg2);
writer.flush();
}
catch (Exception e) {
System.out.println(e);
}
}
}
|
Output:
A Computer Science Portal GFG, GFG and GeeksforGeeks
Last Updated :
31 Jan, 2019
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