Java.io.PrintWriter class in Java | Set 2

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:

  
  
  

  15
  

• 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:

  10

• 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:

  F

• 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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