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ahahahah :D sorry man, I'm not good in english :)

but what do you mean by this?:

you better read the doc for the class your not sure of
java.io.File Files (Java Platform SE 7 )

To make it short, File class is not capable of reading and writing from and to files.
I think it...

I think they are called Object Reference Variable, the variable that points to the object created as a way of accessing them.
FileWriter, PrintWriter and other classes in java are Objects, and the...

public FileDisplay(String Name_file) throws IOException
{
filename=Name_file;

//Open the output file
new FileWriter(filename);

//Open the input file
new File("Results.txt");...