Java.io.PrintWriter class in Java | Set 2

Last Updated : 24 Jan, 2017

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

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

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()

  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)

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)

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)

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)

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 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)

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)

        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)

        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)

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)

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

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

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

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

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(); 
      } 
   } 
} 

HelloWorld

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