For learning Javanese language it is necessary to know alphabets in Javanese. You have to know alphabets in Javanese to learn writing in Javanese language. Javanese alphabets are the building blocks of Javanese language. There are 27 characters in Javanese alphabets. Javanese alphabets are made up of Javanese vowels and Javanese consonants. The Javanese alphabets contain 6 vowels and 21 consonants. Javanese vs German gives a comparison between Javanese and German alphabets.
Javanese script is also known as Javanese writing system or Javanese orthography. The set of visible signs used to represent units of Javanese language in a systematic way is called Javanese Script. The Javanese language uses Arabic, Javanese, Latin i.e. Javanese alphabets are derived from Arabic, Javanese, Latin script. The script decides the writing direction of the any language, hence the writing direction of Javanese is Left-To-Right, Horizontal. Learn Javanese Greetings where you will find some interesting phrases.
Is Javanese hard to learn? The answer to this question is that it depends on one's native language. One should start learning Javanese language with Javanese alphabets and Javanese phonology.
Time taken to learn any language that is mentioned here is the approximate time required to learn specific language for the person who is proficient in English. You can also go through all Indian Languages and find if Javanese is one of the language of India.