Java tutorial
import java.io.FilterReader; import java.io.Reader; import java.io.StringReader; public class Main { public static void main(String[] args) throws Exception { int i = 0; Reader r = new StringReader("ABCDEFG"); // create new filter reader FilterReader fr = new FilterReader(r) { }; // read till the end of the stream while ((i = fr.read()) != -1) { char c = (char) i; System.out.println(c); } } }