Java FilterWriter Class

by Online Tutorials Library July 14, 2022

Java FilterWriter

Java FilterWriter class is an abstract class which is used to write filtered character streams.

The sub class of the FilterWriter should override some of its methods and it may provide additional methods and fields also.

Fields

Modifier	Type	Field	Description
protected	Writer	out	The underlying character-output stream.

Constructors

Modifier	Constructor	Description
protected	FilterWriter(Writer out)	It creates InputStream class Object

Methods

Modifier and Type	Method	Description
void	close()	It closes the stream, flushing it first.
void	flush()	It flushes the stream.
void	write(char[] cbuf, int off, int len)	It writes a portion of an array of characters.
void	write(int c)	It writes a single character.
void	write(String str, int off, int len)	It writes a portion of a string.

FilterWriter Example

 import java.io.*; class CustomFilterWriter extends FilterWriter { CustomFilterWriter(Writer out) { super(out); } public void write(String str) throws IOException { super.write(str.toLowerCase()); } } public class FilterWriterExample { public static void main(String[] args) { try { FileWriter fw = new FileWriter(“Record.txt”);  CustomFilterWriter filterWriter = new CustomFilterWriter(fw); filterWriter.write(“I LOVE MY COUNTRY”); filterWriter.close(); FileReader fr = new FileReader(“record.txt”); BufferedReader bufferedReader = new BufferedReader(fr); int k; while ((k = bufferedReader.read()) != -1) { System.out.print((char) k); } bufferedReader.close(); } catch (IOException e) { e.printStackTrace(); } } } 

Output:

i love my country

While running the current program if the current working directory does not contain the file, a new file is created and CustomFileWriter will write the text “I LOVE MY COUNTRY” in lowercase to the file.

Next TopicJava FilterReader class

Java FilterWriter Class

Java FilterWriter

Fields

Constructors

Methods

FilterWriter Example

Java Static Import

Java BoxLayout

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