Basic File handling program in java with reader/writer

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import java.io.*;

class fileH2
{
public static void main(String args[])throws IOException
{
BufferedReader obj=new BufferedReader(new InputStreamReader(System.in));

System.out.println("Enter a number of elements");
int n=Integer.parseInt(obj.readLine());

FileWriter fw=new FileWriter("Stu2.dat",true);
BufferedWriter Bw=new BufferedWriter(fw);
PrintWriter pw=new PrintWriter(Bw);

for(int a=0;a<n;a++)
{

System.out.println("Enter serial number");
int c=Integer.parseInt(obj.readLine());
System.out.println("Enter Name");
String N=obj.readLine();
pw.println(c+" "+N);

}
Bw.close();
fw.close();
pw.close();

FileReader fr=new FileReader("Stu2.dat");
BufferedReader br=new BufferedReader(fr);

String abhas;
while((abhas=br.readLine())!=null)
{

System.out.println(abhas);
}

fr.close();
br.close();
}
}