FileWriter

FileWriter class is a subclass of Writer abstract class and it is used to write a character, character array or a String to a file.

FileWriter Constructor:

FileWriter(File file)
This constructor creates a FileWriter object to write characters to a file referenced by a File object. Example-: `File file = new File("D:\\Textbook.txt"); FileWriter fr = new FileWriter(file);`

Methods for writing using FileWriter

Some methods that we generally use while working with FileWriter are shown in the table below :

Methods	Description
flush()	This method flushes any buffered data to be written out of this character output stream.
write(int c)	This method writes one character at a time to this character output stream.
write(char[])	This method writes a whole character array at a time to this character output stream.
write(String str)	This method writes a String to this character output stream.
close()	This method closes this output stream and also frees any resources connected with this output stream.

Writing a character array and a String to a file using FileWriter class.

Writing to a file TextBook.txt using its path D:\\TextBook.txt.

import java.io.*;
class A
{
public static void main(String... ar)
{
char[] arr= {'H', 'e', 'l' , 'l' , 'o', '-'};
String str="How are you today?";

try
{
File file= new File("D:\\TextBook.txt");
FileWriter fw= new FileWriter(file); // This will create the file and we don't need to call createNewFile();

for(char ch : arr) //For-each loop to write each character to a file
fw.write(ch);

fw.write(str); //Writing a String to a file

fw.flush();
fw.close();
}
catch(IOException e)
{
System.out.println(e);
}

}
}

Output is -:

After the execution of this program, a file "TextBook.txt" is created in the D: drive, with contents -:
Hello-How are you today?

Program Analysis

We are writing a char array and a String to a file referenced by a File object, using FileWriter class.
FileReader's read(int c) method writes one character at a time to a file.
FileReader's read(String str) method writes a whole String at once, to a file.
Finally, the open character stream is closed by close() method to free up any connected resource.

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