Going from German to Javanese (Basa Jawa) has a composite linguistic distance of 84% (heuristic estimate). Below is the dimension-by-dimension breakdown.
Shared vocabulary, cognates, and loanwords.
Morphology, syntax, word order, cases.
Shared sounds and phoneme inventory.
Latin → Latin/Javanese
Indo-European ↔ Austronesian
The 5 languages with the lowest linguistic distance from German:
A quick 3-question check between German and Javanese. No signup.