Android How to Program, 3/e

D.13 Wrap-Up

In this appendix, you learned more about method declarations. You also learned the difference between non-static and static methods and how to call static methods by preceding the method name with the name of the class in which it appears and the dot (.) separator. You learned how to use operators + and += to perform string concatenations. We discussed how the method-call stack and activation records keep track of the methods that have been called and where each method must return to when it completes its task. We also discussed Java’s promotion rules for converting implicitly between primitive types and how to perform explicit conversions with cast operators. Next, you learned about some of the commonly used packages in the Java ...