Java.io.PrintWriter class in Java | Set 2

Last Updated : 23 Jul, 2025

Java.io.PrintWriter class in Java | Set 1 More methods:

PrintWriter printf(Locale l, String format, Object... args) : A convenience method to write a formatted string to this writer using the specified format string and arguments.

Syntax :public PrintWriter printf(Locale l,
        String format,
        Object... args)
Parameters:
l - The locale to apply during formatting. If l is null then no localization is applied.
format - A format string as described in Format string syntax
args - Arguments referenced by the format specifiers in the format string.
Returns: This writer
Throws:
IllegalFormatException
NullPointerException

Java

import java.io.*;
import java.util.Locale;
//Java program to demonstrate printf method
public class PrintWriterDemo {
    public static void main(String[] args) {
        String s = "for";

        // create PrintWriter object
        PrintWriter pr= new PrintWriter(System.out);

        // printf this string
        pr.printf(Locale.CANADA, "Geeks%sGeeks", s);

        // flush the stream
        pr.flush();

    }
}

Output:
GeeksforGeeks

PrintWriter printf(String format, Object... args) : A convenient method to write a formatted string to this writer using the specified format string and arguments.

Syntax :public PrintWriter printf(String format,
        Object... args)
Parameters:
format - A format string as described in Format string syntax
args - Arguments referenced by the format specifiers in the format string.
Returns: This writer
Throws:
IllegalFormatException
NullPointerException

Java

import java.io.*;
//Java program to demonstrate printf(String format, Object... args) method
public class PrintWriterDemo {
    public static void main(String[] args) {
        String s = "for";

        // create PrintWriter object
        PrintWriter pr= new PrintWriter(System.out);

        // printf this string
        pr.printf("Geeks%sGeeks", s);

        // flush the stream
        pr.flush();

    }
}

Output:
GeeksforGeeks

void println(): Terminates the current line by writing the line separator string.

Syntax :public void println()

Java

  import java.io.*;
//Java program to demonstrate println() method
public class PrintWriterDemo {
    public static void main(String[] args) {
        String s = "GeeksforGeeks";

        // create PrintWriter object
        PrintWriter pr= new PrintWriter(System.out);

        // printf this string
        pr.printf("%s", s);

        // flush the stream
        pr.flush();

    }
}

Output:
GeeksforGeeks

void println(boolean x): Prints a boolean and then terminate the line.

Syntax :public void println(boolean x)

Java

import java.io.*;
//Java program to demonstrate println(boolean) method
public class PrintWriterDemo {
    public static void main(String[] args) {

        // create PrintWriter object
        PrintWriter pr= new PrintWriter(System.out);

        // print a boolean and change line
        pr.println(true);
        pr.print("New Line");

        // flush the stream
        pr.flush();

    }
}

Output:
true
New Line

void println(char x): Prints a character and then terminate the line.

Syntax :public void println(char x)

Java

 import java.io.*;
//Java program to demonstrate println(char x) method
public class PrintWriterDemo {

    public static void main(String[] args) {
        char c = 'a';

        // create PrintWriter object
        PrintWriter pr= new PrintWriter(System.out);

        // print a char and change line
        pr.println(c);
        pr.println('b');

        // flush the stream
        pr.flush();

    }
}

Output:
a
b

void println(char[] x): Prints an array of characters and then terminate the line.

Syntax :public void println(char[] x)

Java

import java.io.*;
//Java program to demonstrate println(char[] x) method
public class PrintWriterDemo {
    public static void main(String[] args) {
        char[] c = {'a', 'b', 'c'};

        // create PrintWriter object
        PrintWriter pr= new PrintWriter(System.out);

        // print an array and change line
        pr.println(c);

        // flush the stream
        pr.flush();


    }
}

Output:
abc

void println(double x): Prints a double and then terminate the line.

Syntax :public void println(double x)

Java

import java.io.*;
//Java program to demonstrate println(double x) method
public class PrintWriterDemo {
    public static void main(String[] args) {
        double c = 176.348;

        // create PrintWriter object
        PrintWriter pr= new PrintWriter(System.out);

        // print a double and change line
        pr.println(c);

        // flush the stream
        pr.flush();

    }
}

Output:

176.348

void println(float x): Prints a float and then terminate the line.

Syntax :public void println(float x)

Java

//Java program to demonstrate println(float x) method
 import java.io.*;
public class PrintWriterDemo {

    public static void main(String[] args) {
        float c = 5.76348f;

        // create PrintWriter object
        PrintWriter pr= new PrintWriter(System.out);

        // print a float and change line
        pr.println(c);

        // flush the stream
        pr.flush();


    }
}

Output:

5.76348

void println(int x): Prints an integer and then terminate the line.

Syntax :public void println(boolean x)

Java

import java.io.*;
//Java program to demonstrate println(int x) method
public class PrintWriterDemo {

    public static void main(String[] args) {
        int c = 15;

        // create PrintWriter object
        PrintWriter pr= new PrintWriter(System.out);

        // print an integer and change line
        pr.println(c);

        // flush the stream
        pr.flush();


    }
}

Output:

void println(long x): Prints a long integer and then terminate the line.

Syntax :public void println(long x)

Java

        import java.io.*;
//Java program to demonstrate println(long x) method
public class PrintWriterDemo {

    public static void main(String[] args) {
        long c = 1252344125l;
        try {
            // create PrintWriter object
            PrintWriter pr= new PrintWriter(System.out);

            // print a long and change line
            pr.println(c);

            // flush the stream
            pr.flush();

        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}

Output:

1252344125

void println(Object x) :Prints an Object and then terminate the line.

Syntax :public void println(Object x)

Java

        import java.io.*;
//Java program to demonstrate println(Object x) method
public class PrintWriterDemo {

    public static void main(String[] args) {
        Object c = 10;

        // create PrintWriter object
        PrintWriter pr= new PrintWriter(System.out);

        // print an object and change line
        pr.println(c);

        // flush the stream
        pr.flush();

    }
}

Output:

void println(String x) : Prints a String and then terminate the line.

Syntax :public void println(boolean x)

Java

 import java.io.*;
//Java program to demonstrate println(String x) method
public class PrintWriterDemo {

    public static void main(String[] args) {
        String c = "GeeksforGeeks";

        // create PrintWriter object
        PrintWriter pr= new PrintWriter(System.out);

        // print a string and change line
        pr.println(c);

        // flush the stream
        pr.flush();

    }
}

Output:

GeeksforGeeks

protected void setError() : Sets the error state of the stream to true.

Syntax :public void println(String x)

Java

import java.io.*;
//Java program to demonstrate setError() method
public class PrintWriterDemo extends PrintWriter {

    public PrintWriterDemo(OutputStream out) {
        super(out);
    }

    public static void main(String[] args) {
        char c[] = {70, 71, 72, 73, 74, 75, 76};

        // create PrintWriter object
        PrintWriterDemo pr= new PrintWriterDemo(System.out);

        // write char 1-3
        pr.write(c, 1, 3);

        // flush the stream
        pr.flush();

        // set an internal error
        pr.setError();
    }
}

Output:

GHI

void write(char [] buf, int off, int len) : Writes len char from the specified char array starting at offset off to this stream.

Syntax :public void write(char [] buf,
        int off,
        int len)
Overrides:
write in class FilterOutputStream
Parameters:
buf - A char array
off - Offset from which to start taking char 
len - Number of char to write

Java

import java.io.*;
//Java program to demonstrate write() method
public class PrintWriterDemo {

    public static void main(String[] args) {
        char c[] = {70, 71, 72, 73, 74, 75, 76};
        // create PrintWriter object
        PrintWriter pr= new PrintWriter(System.out);

        // write char 1-3
        pr.write(c, 1, 3);

        // flush the stream
        pr.flush();

    }
}

Output:

GHI

void write(int b) : Writes the specified char to this stream.

Syntax :public void write(int b)
Overrides:
write in class Writer
Parameters:
 b - The char to be written

Java

 import java.io.*;
//Java program to demonstrate write(int b) method
public class PrintWriterDemo {

    public static void main(String[] args) {
        int c = 70;

        // create PrintWriter object
        PrintWriter pr= new PrintWriter(System.out);

        // write char c which is character F in ASCII
        pr.write(c);

        // flush the stream
        pr.flush();

    }
}

Output:

void write(String s) : Writes a string.

Syntax :public void write(String s)
Parameters:
s - String to be written

Java

import java.io.*;
public class PrintWriterDemo {

   public static void main(String[] args) {
      String s = "Hello";
      try {

         // create a new writer
         PrintWriter pw = new PrintWriter(System.out);

         // write strings
         pw.write(s);
         pw.write(" World");

         // flush the writer
         pw.flush();

      } catch (Exception ex) {
         ex.printStackTrace();
      }
   }
}

Hello World

void write(String s, int off, int len) : Writes a portion of a string.

Syntax :public void write(String s,
         int off,
         int len)
Parameters:
s - A String
off - Offset from which to start writing characters
len - Number of characters to write

Java

import java.io.*;

public class PrintWriterDemo {

   public static void main(String[] args) {
      String s = "Hello World";
      try {

         // create a new writer
         PrintWriter pw = new PrintWriter(System.out);

         // write substrings
         pw.write(s, 0, 5);
         pw.write(s, 6, 5);

         // flush the writer
         pw.flush();

      } catch (Exception ex) {
         ex.printStackTrace();
      }
   }
}