Java.io.BufferedWriter class methods in Java

Bufferreader class writes text to character-output stream, buffering characters.Thus, providing efficient writing of single array, character and strings. A buffer size needs to be specified, if not it takes Default value.
An output is immediately set to the underlying character or byte stream by the Writer.

Class Declaration

public class BufferedWriter
   extends Writer

Constructors

• BufferedWriter(Writer out): Creates a buffered character-output stream that uses a default-sized output buffer.
• BufferedWriter(Writer out, int size): Creates a new buffered character-output stream that uses an output buffer of the given size.

Methods:

• write() : java.io.BufferedWriter.write(int arg) writes a single character that is specified by an integer argument.
  Syntax :

  public void write(int arg)
  Parameters : 
  arg : integer that specifies the character to write          
  Return :
  Doesn't return any value.
  

  Implementation :

  
  

  
  
  

  //Java program illustrating use of write(int arg) method    import java.io.*;  public class NewClass {     public static void main(String[] args)     {         //initializing FileWriter         FileWriter geek_file;          try         {             geek_file = new FileWriter("ABC.txt");                            // Initialing BufferedWriter             BufferedWriter geekwrite = new BufferedWriter(geek_file);             System.out.println("Buffered Writer start writing :)");                            // Use of write() method to write the value in 'ABC' file             // Printing E             geekwrite.write(69);                             // Printing 1             geekwrite.write(49);                 // Closing BufferWriter to end operation             geekwrite.close();             System.out.println("Written successfully");         }         catch (IOException excpt)         {             excpt.printStackTrace();         }        } }

  Note : In the given output, you can’t see it’s action on file. Run this code on any compiler in your device. It creates a new file ‘ABC’ and write “E 1 ” in it.

  Output : 
  Buffered Writer start writing :)
  Written successfully
  

• write() : java.io.BufferedWriter.write(String arg, int offset, int length) writes String in the file according to its arguments as mentioned in the Java Code.
  Syntax :

  public void write(String arg, int offset, int length)
  Parameters : 
  arg : String to be written
  offset : From where to start reading the string
  length : No. of characters of the string to write          
  Return :
  Doesn't return any value.
  

  Implementation :

  
  

  
  
  

  //Java program illustrating use of write(String arg, int offset, int length) method    import java.io.*; public class NewClass {     public static void main(String[] args)     {         //Initializing a FileWriter         FileWriter geek_file;         try         {             geek_file = new FileWriter("ABC.txt");                        // Initializing a BufferedWriter             BufferedWriter geekwrite = new BufferedWriter(geek_file);             System.out.println("Buffered Writer start writing :)");             String arg = "Hello Geeks";             int offset = 6;             geekwrite.write(arg,offset,arg.length()-offset);                // Closing Buffer             geekwrite.close();             System.out.println("Written successfully");         }         catch (IOException except)         {             except.printStackTrace();         }           } }

  Note : In the given output, you can’t see it’s action on file. Run this code on any compiler in your device. It creates a new file ‘ABC’ and write “Geeks” in it.Here,

  arg = Hello Geeks
  offset = 6
  length = arg.length So, when we minus offset : 6, it will write 'Geeks' only in the file.

  Output:

  Buffered Writer start writing :)
  Written successfully                                                   
  

• newLine() : java.io.BufferedWriter.newLine() breaks/separates line.
  Syntax :
  
  
  
  

  public void newLine()       
  Return :
  Doesn't return any value.
  

  Implementation :

  
  

  
  
  

  //Java program explaining use of newLine() method    import java.io.*;  public class NewClass {     public static void main(String[] args)     {         //initializing FileWriter         FileWriter geek_file;          try         {             geek_file = new FileWriter("ABC.txt");                            // Initialing BufferedWriter             BufferedWriter geekwrite = new BufferedWriter(geek_file);             System.out.println("Buffered Writer start writing :)");                            // Use of write() method to write the value in 'ABC' file             // Printing "GEEKS"             geekwrite.write("GEEKS");                             // For next line             geekwrite.newLine();                             // Printing "FOR"             geekwrite.write("FOR");                              // For next line             geekwrite.newLine();                            // Printing "GEEKS"             geekwrite.write("FOR");                 // Closing BufferWriter to end operation             geekwrite.close();             System.out.println("Written successfully");         }         catch (IOException excpt)         {             excpt.printStackTrace();         }        } }

  Note :In the given output, you can’t see it’s action on file. Run this code on any compiler in your device. It creates a new file ‘ABC’ and write write
  | GEEKS |
  | FOR |
  | GEEKS | Here, newLine() method breaks line after GEEKS and FOR is written in next line
  Output :

  Buffered Writer start writing :)
  Written successfully
  

• flush() : java.io.BufferedWriter.flush() flushes character from write buffer.
  Syntax :

  public void flush()    
  Return :
  Doesn't return any value.
  

• close() : java.io.BufferedWriter.close() flushes character from write buffer and then close it.
  Syntax :

  public void close()    
  Return :
  Doesn't return any value.
  

  Implementation of flush(), close() method :

  
  

  
  
  

  //Java program illustrating use of flush(), close() method    import java.io.*; //BufferedWriter, FileWriter, IOException public class NewClass {     public static void main(String[] args)     {         FileWriter geek_file; //initializing FileWriter         try         {             geek_file = new FileWriter("ABC.txt");             // Initialing BufferedWriter             BufferedWriter geekwrite = new BufferedWriter(geek_file);             System.out.println("Buffered Writer start writing :)");             // Use of write() method to write the value in 'ABC' file                geekwrite.write(69); // Printing E             geekwrite.newLine(); // For next line             geekwrite.write(49); // Printing 1                // flush() method : flushing the stream             geekwrite.flush();             // close() method : closing BufferWriter to end operation             geekwrite.close();             System.out.println("Written successfully");         }         catch (IOException excpt)         {             excpt.printStackTrace();         }        } }

  Note : You can’t see it’s action on file. Run this code on any compiler in your device.It creates a new file ‘ABC’ and write
  | E |
  | 1 |
  in it.Here, flush() method flushes the stream and close() method closes the writer.

  Output : 
  Buffered Writer start writing :)
  Written successfully
  

  This article is contributed by Mohit Gupta 🙂. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

  Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.

Attention reader! Don’t stop learning now. Get hold of all the important Java Foundation and Collections concepts with the Fundamentals of Java and Java Collections Course at a student-friendly price and become industry ready. To complete your preparation from learning a language to DS Algo and many more,  please refer Complete Interview Preparation Course.