O'Reilly logo

Programmer's Guide to Java™ Certification, A: A Comprehensive Primer, Second Edition by Rolf W. Rasmussen, Khalid A. Mughal

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Section 4: Language Fundamentals

  • Identify classes that correctly implement an interface where that interface is either java.lang.Runnable or a fully specified interface in the question.

  • State the effect of using a variable or array element of any kind when no explicit assignment has been made to it.

Relevant Sections

Read Sections 2.3 “Variable Declarations” and 2.4 “Initial Values for Variables.” For interface implementation, see Section 6.4 “Interfaces.” For implementation of java.lang.Runnable, see Section 9.3 “Thread Creation.”

Study Notes

Interfaces can be defined within several contexts, and the contexts influence the meaning of the declaration and the modifiers applicable. The modifiers used also influence the restrictions that apply for ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required