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
java_files_io.htm
