File Streams

Reference: Features of java.io.File

FileReader, FileWriter, FileInputStream, FileOutputStream.

import java.io.*;

public class Copy {
    public static void main(String[] args) throws IOException {
    File inputFile = new File("infile.txt");
    File outputFile = new File("outfile.txt");

        FileReader in = new FileReader(inputFile);
        FileWriter out = new FileWriter(outputFile);
        int c;
        while ((c = in.read()) != -1)
           out.write(c);
        in.close();
        out.close();
    }
}