Similar to anonymous inner classes, such nested classes are actually closures. Non-static nested classes are a different beast. There is no semantic difference between a static nested class and every other class. 3f ', stats. You use static nested classes if you just want to keep your classes together if they belong topically together or if the nested class is exclusively used in the enclosing class. I am still very new to Java, so what I want to end up with is just to take an ArrayList as a parameter, and return it within the main method using: StatCalc stats new StatCalc (someArrayList) ('Mean of someArrayList is. However, the actual question is: What is the purpose of declaring a nested class static or not? If calc is a variable of type StatCalc, then the following instance methods are.
Statcalc java code#
I don't think the real difference became clear in the above answers. If you want a local inner class which implements multiple interfaces or which implements interfaces while extending some class other than Object or which specifies its own constructor, you're stuck creating a regular named local inner class. Consider the following classes: class OuterClass block placed outside any method).īe clear that an anonymous inner class is simply a less flexible way of creating a local inner class with one instance. Objects that are instances of an inner class exist within an instance of the outer class. Static nested classes are accessed using the enclosing class name: OuterClass.StaticNestedClassįor example, to create an object for the static nested class, use this syntax: OuterClass.StaticNestedClass nestedObject = new OuterClass.StaticNestedClass() Non-static nested classes are called inner classes. Nested classes that are declared static are simply called static nested classes. Nested classes are divided into two categories: static and non-static.
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