I get asked questions like this all the time. Basically the question boils down to “when a fact about a declared member can be deduced by the compiler should the explicit declaration of that fact be (1) required, (2) optional, or (3) forbidden?” There’s no one easy answer. Each one has to be taken on … Read more
If IncomingHandler class is not static, it will have a reference to your Service object. Handler objects for the same thread all share a common Looper object, which they post messages to and read from. As messages contain target Handler, as long as there are messages with target handler in the message queue, the handler … Read more
Java has static nested classes but it sounds like you’re looking for a top-level static class. Java has no way of making a top-level class static but you can simulate a static class like this: Declare your class final – Prevents extension of the class since extending a static class makes no sense Make the … Read more
From the Java Tutorial: Nested classes are divided into two categories: static and non-static. Nested classes that are declared static are simply called static nested classes. Non-static nested classes are called inner classes. Static nested classes are accessed using the enclosing class name: OuterClass.StaticNestedClass For example, to create an object for the static nested class, … Read more