How do I take input from user on run time and save it in a txt file on java? Simple read and write operations?

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Java

FileInputStream p = new FileInputStream(file1);
error on this line error java 18

What I have tried:

package readwrite;

import java.io.IOException;

//import java.util.Scanner;

public class maininput {

public static void main(String[] args) throws IOException {
// TODO Auto-generated method stub
//Scanner x = new Scanner(System.in);
//System.out.print("enter name");
//String a = x.nextLine();
//System.out.println(a);

readwrite r = new readwrite();
r.a();
}

}

"readwrite"

package readwrite;
import java.util.Scanner;
import java.io.*;

public class readwrite {

File file1 = new File("f:\\readwrite.xml");
public void a() throws IOException{

PrintWriter w = new PrintWriter(new FileWriter("f:\\readwrite.xml",true));
Scanner s = new Scanner(System.in);
String a = s.nextLine();
w.println(a);
w.close();
FileInputStream p = new FileInputStream(file1);

InputStreamReader i = new InputStreamReader (p);
BufferedReader b = new BufferedReader(i);
String read ="";
while(read!=null){
read = b.readLine();
if(read.equals(null)){
break;
}
else {
System.out.println(read);
}
}



}
}