(1Z0-808)-Java SE 8 Programmer I:

Exam Number: 1Z0-808
Exam Name: Java SE 8 Programmer I
Associated Certifications: Oracle Certified Java Programmer, Silver SE 8 (Oracle Certified Associate, Java SE 8 Programmer - Available only in Japan), Oracle Certified Associate, Java SE 8 Programmer
Exam Product Version: Java SE
Duration: 150
Number of Questions: 77
Passing Score 65%
Validated Against: This exam has been written for the Java SE 8 release.
format: Multiple Choice

You can see that it is multiple choice questions based exam where you need to score at least 65% to pass the exam. Since exam contains 77 questions, you need to at least get 51 questions correct to clear the exam