Compile errors: deleting and renaming file in java?

Question

I have used the functions oldFile.delete() and newfile.rename("oldFile.txt") both are file object but this is not working, delete function and rename function gives an error, the source code is below:

      package urlFiltering;

      import java.io.*;
      import java.net.InetAddress;

      public class mainForm{


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

    String hostName="www.stackoverflow.com";

        InetAddress inetAddress=InetAddress.getByName(hostName);
                   String host=inetAddress.toString();
     FileReader inputFile = new FileReader("StoredIp.txt");
     File tempFile= new File("tempFile.txt");
            BufferedReader bufferReader = new BufferedReader(inputFile);
            String line;
            while ((line = bufferReader.readLine()) != null)   {
                    if(host.equals(line))
                            continue;
                      else
                            {
                                if (!tempFile.exists()) {
                                    tempFile.createNewFile();
                                }
                                FileWriter fw = new FileWriter(tempFile,true);
                                BufferedWriter bw = new BufferedWriter(fw);
                                bw.write(line);
                                bw.newLine();
                                bw.close();
                            }                                 
                    }

                bufferReader.close();  
                inputFile.delete();//error
                tempFile.renameTo("StoredIp.txt"); //error

       }
    }

Answer 1

Your inputFile is a FileReader , which doesn't have a delete() method. You can create a File object to represent that file, and give that File as input to the FileReader constructor. Then you can also invoke the delete() method on the File object at the end, instead of on the FileReader . The renameTo() gives you an error because the method expects a File and not a String . Do renameTo(new File("StoredIp.txt")) for it instead. In other words, this:

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.net.InetAddress;

public class mainForm {

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

    String hostName = "www.stackoverflow.com";

    InetAddress inetAddress = InetAddress.getByName(hostName);
    String host = inetAddress.toString();
    File inputF = new File("StoredIp.txt");
    FileReader inputFile = new FileReader(inputF);
    File tempFile = new File("tempFile.txt");
    BufferedReader bufferReader = new BufferedReader(inputFile);
    String line;
    while ((line = bufferReader.readLine()) != null) {
        if (host.equals(line))
            continue;
        else {
            if (!tempFile.exists()) {
                tempFile.createNewFile();
            }
            FileWriter fw = new FileWriter(tempFile, true);
            BufferedWriter bw = new BufferedWriter(fw);
            bw.write(line);
            bw.newLine();
            bw.close();
        }
    }

    bufferReader.close();
    inputF.delete();// no more error
    tempFile.renameTo(new File("StoredIp.txt")); // no more error

}
}