Задачи | 2 уровень | 4 лекция

StringWriter sw = new StringWriter();
PrintWriter sr = new PrintWriter(sw) {
    @Override
    public String toString() {
        return out.toString();
    }
};

public static String decode(StringReader reader, int key) throws IOException {

    public static String getStackTrace(Throwable throwable) {
        PrintStream oldErr = System.err;
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        PrintStream newErr = new PrintStream(byteArrayOutputStream);

        System.setErr(newErr);
        throwable.printStackTrace();
        System.setErr(oldErr);

        return byteArrayOutputStream.toString();
    }