Working with files using FileInputStream and FileOutputStream

Working with files with FileInputStreamand FileOutputStream. I’m reading Schildt’s book and got to the point of working with files. The example says that you need to run the program from the command line and enter file names. But I'm learning in IntelliJ. How to work with files by specifying the path to them? Here's an example:

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class CopyFile {
    public static void main(String[] args) {
        int i;

        FileInputStream fin;
        FileOutputStream fout;

        if (args.length != 2) {
            System.out.println("Usage: CopyFile From To.");
            return;
        }

        try {
            fin = new FileInputStream(args[0]);
        } catch (FileNotFoundException exc) {
            System.out.println("Input file not found.");
            return;
        }

        try {
            fout = new FileOutputStream(args[1]);
        } catch (FileNotFoundException exc) {
            System.out.println("Error opening output file.");
            try {
                fin.close();
            } catch (IOException exc2) {
                System.out.println("Error closing input file.");
            }
            return;
        }

        try {
            do {
                i = fin.read();
                if (i != -1) fout.write(i);
            } while (i != -1);
        } catch (IOException exc) {
            System.out.println("Fi;e error.");
        }

        try {
            fin.close();
        } catch (IOException exc) {
            System.out.println("Error closing input file.");
        }

        try {
            fout.close();
        } catch (IOException exc) {
            System.out.println("Error closing output file.");
        }
    }
}