Question

I’m new to java and I’m trying to write this code but somehow it sees it as an error when using my variables. which has been declared ofc.

import java.io.*;

public class FileRead {
     public void readCountries(String file){
         try{
             ObjectInputStream inputStream = new ObjectInputStream(new FileInputStream("countries"));
             Object obj = null;
             while ((obj = inputStream.readObject()) != null) {
                 if (obj instanceof Country) {
                     System.out.println(((Country)obj).toString());
                 }
             }
         } catch (EOFException ex) { //This exception will be caught when EOF is reached
                System.out.println("End of file reached.");
            } catch (ClassNotFoundException ex) {
                ex.printStackTrace();
            } catch (FileNotFoundException ex) {
                ex.printStackTrace();
            } catch (IOException ex) {
                ex.printStackTrace();
            } finally {
                //Close the ObjectInputStream
                try {
                    if (inputStream != null) { //////////ERROR: inputStream cannot be resolved to a variable
                        inputStream.close(); //////////// Same here
                    }
                } catch (IOException ex) {
                    ex.printStackTrace();
                }
            }
        }
}

Answer 1

Move your inputStream declaration outside try block. If you define inside try, it is not visible outside the try block.

    ObjectInputStream inputStream = null;
    try{
     inputStream = new ObjectInputStream(new  FileInputStream("countries"));
     ........
 }