Java is a language, and big data is more like a methodology or a collection. Engaged in the big data industry, you need to master more skills, and java must be mastered. Therefore, if you want to learn big data, you must first learn the basic knowledge of Java. Net Big Data, a massive open online course, seems to have a java foundation to learn. Someone in the group bought it and said that the teacher was very detailed and clear. The learning difficulty is gradually improving. I don't feel too tired to study, but whether I can find a job depends on many factors.