
- Java Tutorial
- Java - Home
- Java - Overview
- Java - Environment Setup
- Java - Basic Syntax
- Java - Object & Classes
- Java - Constructors
- Java - Basic Datatypes
- Java - Variable Types
- Java - Modifier Types
- Java - Basic Operators
- Java - Loop Control
- Java - Decision Making
- Java - Numbers
- Java - Characters
- Java - Strings
- Java - Arrays
- Java - Date & Time
- Java - Regular Expressions
- Java - Methods
- Java - Files and I/O
- Java - Exceptions
- Java - Inner classes
- Java Object Oriented
- Java - Inheritance
- Java - Overriding
- Java - Polymorphism
- Java - Abstraction
- Java - Encapsulation
- Java - Interfaces
- Java - Packages
- Java Advanced
- Java - Data Structures
- Java - Collections
- Java - Generics
- Java - Serialization
- Java - Networking
- Java - Sending Email
- Java - Multithreading
- Java - Applet Basics
- Java - Documentation
- Java Useful Resources
- Java - Questions and Answers
- Java - Quick Guide
- Java - Useful Resources
- Java - Discussion
- Java - Examples
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Java - FileWriter Class
This class inherits from the OutputStreamWriter class. The class is used for writing streams of characters.
This class has several constructors to create required objects. Following is a list.
Sr.No. | Constructor & Description |
---|---|
1 | FileWriter(File file) This constructor creates a FileWriter object given a File object. |
2 | FileWriter(File file, boolean append) This constructor creates a FileWriter object given a File object with a boolean indicating whether or not to append the data written. |
3 | FileWriter(FileDescriptor fd) This constructor creates a FileWriter object associated with the given file descriptor. |
4 | FileWriter(String fileName) This constructor creates a FileWriter object, given a file name. |
5 | FileWriter(String fileName, boolean append) This constructor creates a FileWriter object given a file name with a boolean indicating whether or not to append the data written. |
Once you have FileWriter object in hand, then there is a list of helper methods, which can be used to manipulate the files.
Sr.No. | Method & Description |
---|---|
1 | public void write(int c) throws IOException Writes a single character. |
2 | public void write(char [] c, int offset, int len) Writes a portion of an array of characters starting from offset and with a length of len. |
3 | public void write(String s, int offset, int len) Write a portion of a String starting from offset and with a length of len. |
Example
Following is an example to demonstrate class −
import java.io.*; public class FileRead { public static void main(String args[])throws IOException { File file = new File("Hello1.txt"); // creates the file file.createNewFile(); // creates a FileWriter Object FileWriter writer = new FileWriter(file); // Writes the content to the file writer.write("This\n is\n an\n example\n"); writer.flush(); writer.close(); // Creates a FileReader Object FileReader fr = new FileReader(file); char [] a = new char[50]; fr.read(a); // reads the content to the array for(char c : a) System.out.print(c); // prints the characters one by one fr.close(); } }
This will produce the following result −
Output
This is an example