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 [email protected] See your article appearing on the GeeksforGeeks main page and help other Geeks.

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