Adding non printable chars to a string in Java?

Question

I need to add some non printable chars to a string in java so it can be sent down a tcp pipe. the chars mean something to the protocol I am using (record separator and end o

Answer 1

public final class ProtocolConstants {
    public final char RECORD_SEPARATOR = 0x1e;
    public final char END_OF_TEXT = 0x03;

    private ProtocolConstants() {}
}

something like that?