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

Review Questions

10.4 Which of the following are wrapper classes?

Select the three correct answers.

  1. java.lang.Void

  2. java.lang.Int

  3. java.lang.Boolean

  4. java.lang.Long

  5. java.lang.String

10.5 Which of the following classes do not extend the java.lang.Number class?

Select the two correct answers.

  1. java.lang.Float

  2. java.lang.Byte

  3. java.lang.Character

  4. java.lang.Boolean

  5. java.lang.Short

10.6 Which of these classes define immutable objects?

Select the three correct answers.

  1. Character

  2. Byte

  3. Thread

  4. Short

  5. Object

10.7 Which of these classes have a one-parameter constructor taking a string?

Select the two correct answers.

  1. Void

  2. Integer

  3. Boolean

  4. Character

  5. Object

10.8 Which of the wrapper classes ...

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