where to clone down java files to code example

Example: copy file with byte java

import java.io.FileInputStream;
import java.io.FileOutputStream;

public class Main {
    public static void main(String[] args) {
        FileInputStream in =null;
        FileOutputStream out=null;
        try {
            in=new FileInputStream(args[0]);
            out=new FileOutputStream(args[1]);

            int c;
            while ((c=in.read())!=-1){
                out.write(c);
            }
        }
        catch (Exception e){
            System.out.println("Error Copping File");
        }
    }
}