File handling

[Dayanand]

writer code:-

package reader_Writer;

import java.io.FileWriter;
import java.io.IOException;

public class My2
{

public static void main(String[] args) throws IOException
{

FileWriter writer = null;
try
{

writer = new FileWriter("books.txt");
writer.write("java\n");
writer.write("hibernate\n");
writer.write("spring\n");
writer.write("android");

}
catch (IOException e)
{

e.printStackTrace();

}
finally
{

if (writer != null)
{
writer.flush();
writer.close();
writer=null;
}

}

}

}

is it necessary the below statement to be present in the above program.?
writer=null;
what is the use of writer=null;


ReaderCode:-
package reader_Writer;

import java.io.File;
import java.io.FileReader;

public class My2Extend
{

public static void main(String[] args)
{

FileReader reader = null;
try
{

reader = new FileReader("books.txt");
int size = (int) new File("books.txt").length();
char all[] = new char[size];
reader.read(all);
String s1 = new String(all);
System.out.println(s1);

}
catch (Exception e)
{

e.printStackTrace();

}
finally
{

try
{

if (reader != null)
{

reader.close();
reader = null;

}

}
catch (Exception e2)
{

e2.printStackTrace();

}

}

}

}
what is the use of reader = null; in the above reader code.?

[Eranga]

No need of doing that. close() does all.

[Dayanand]

No need of doing that. close() does all.

is there any real time example for again intializing writer=null; in writer code and reader = null; in reader`s code

[Eranga]

You mean that you want to read the file repeatedly ?