September 2016
Intermediate to advanced
704 pages
18h 29m
English
Content preview from OCA Java SE 8 Programmer I Certification GuideBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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2.2. Identifiers
Identifiers are names of packages, classes, interfaces, methods, and variables. Though identifying a valid identifier is not explicitly included in the exam objectives, there’s a good chance that you’ll encounter a question similar to the following that will require you to identify valid and invalid identifiers:
Question: Which of the following lines of code will compile successfully?
- byte exam_total = 7;
- int exam-Total = 1090;
The correct answer is (a). Option (b) is incorrect because hyphens aren’t allowed in the name of a Java identifier. Underscores are allowed.
2.2.1. Valid and invalid identifiers
Table 2.7 contains a list of rules that will enable you to correctly define valid (and invalid) identifiers, along with some ...
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