OCA: Oracle Certified Associate Java SE 8 Programmer I Study Guide: Exam 1Z0-808

Appendix AAnswers to Review Questions

Chapter 1: Java Building Blocks

1. A, B, E. Option A is valid because you can use the dollar sign in identifiers. Option B is valid because you can use an underscore in identifiers. Option C is not a valid identifier because true is a Java reserved word. Option D is not valid because the dot (.) is not allowed in identifiers. Option E is valid because Java is case sensitive, so Public is not a reserved word and therefore a valid identifier. Option F is not valid because the first character is not a letter, $, or _.
2. D. Boolean fields initialize to false and references initialize to null, so empty is false and brand is null. Brand = null is output.
3. B, D, E. Option A (line 4) compiles because short is an integral ...