What should be my qualifications/skills/experiences before I introduce myself as a certain programmer/developer?

I learn programming by myself. If anyone asked me what languages do I know or what programmer am I, I get confused. Because I don't think knowing the basic syntax of a language doesn't make me a programmer in that language. I should have enough experience right?

Please tell me what should I know of a language before I tell others that I know that language. What experience should I have?

Eg: What kind of experience should I have and what should I know before I introduce myself as a Java Programmer?