Learn Kotlin for Android Development: The Next Generation Language for Modern Android Apps Programming

Appendix

Solutions to the Exercises

The following are the solutions to the exercises given in the chapters.

Chapter 2

Exercise 1: Only (2) is correct. Version (1) uses round brackets for the body, but curly brackets are needed. Version (3) is technically correct but does not use camelcase notation for the class name, and Version (4) tries to use a space in the class name.

Exercise 2: Only (4) is correct. Version (1) uses an undefined “ variable ” keyword. Version (2) uses an undefined “ property ” keyword. Version (3) does not yield to the propertyName:PropertyType property notation. Version (5) does not specify a mutability keyword ( var or val ).

Exercise 3: A val corresponds to an immutable (unchangeable) variable. Setting it to 0.0 means ...