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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