Reader i Writer

 import java.io.*;
import java.io.File;

public class Main {
    public static void main(String[] args) throws IOException {
        InputStreamReader reader=new InputStreamReader(System.in);
        //reader koj zima nekoj input stream
        OutputStreamWriter writer=new OutputStreamWriter(System.out);
        //writer koj go zima output i go cita

        char pom='1';
        while (pom!= '0')
        {
            //se dodeka pomosnata ne e ednakva na nula da gi citame informaciite
            pom= (char) reader.read();
            //read vraka integer vrednost na bajtite
            writer.write(pom);
        }
        reader.close();
        writer.close();
    }
}