Question

I’m trying to read the data from a file that I’ve saved. This code is a part for reading the data “Value”. But the compiler says there is an error at the last part ‘return Value;’. It says ‘Value cannot be resolved as a variable’. What should I do?

public static double[] getValue(){
    FileInputStream fis = null;
    ObjectInputStream ois = null;
    List<Double> newList = new ArrayList<Double>();
    try {
        fis = new FileInputStream("user_data.txt");
        ois = new ObjectInputStream(fis);

       double[] Value = (double[]) ois.readObject();

    } catch (Exception ex) {

        try {
            fis.close();
            ois.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    return Value;
}

Answer 1

Your problem is that you declare Value inside try, so it’s not visible outside. Try this instead:

public static double[] getValue(){
    FileInputStream fis = null;
    ObjectInputStream ois = null;
    List<Double> newList = new ArrayList<Double>();
    double[] Value;

    try {
        fis = new FileInputStream("user_data.txt");
        ois = new ObjectInputStream(fis);

        Value = (double[]) ois.readObject();

    } catch (Exception ex) {

        try {
            fis.close();
            ois.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    return Value;
}