The very first thing is that there is a big difference between Java Certification & Java Courses, So first decide are you a beginner or are you a java developer, If you are a java developer then you can start with the first one, First and second one is similar but third one is for professional. if you are a full-time developer then only you can go with the Oracle Certified Professional Java Programmer. Here I am sharing with you the details of both two:
OCAJP helps in building a foundational understanding of Java and expanding the knowledge of general programming.
Gaining the OCAJP certification is the first step to verify that a professional has the essential high-level skills for becoming an expert Java developer. 2. Oracle Certified Professional Java Programmer (OCPJP)
Oracle Certified Professional Java Programmer or OCPJP is a professional-level certification. It validates the candidate’s knowledge and expertise of Java code development in Java SE 8. This certification is best for those having professional experience with Java.
It is the second of the two exams, first being the OCAJP, required to demonstrate having the necessary high-level skills for becoming an expert Java developer.
Get to know about it more and detailed about the examination and examination from here.