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interface A<T> {
interface B {
// Results in non-static type variable T cannot
// be referenced from a static context
T foo();
}
}
Is there anyway round this? Why is T seen as static when referenced from A.B?
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There is one simple way of solving the non-static variable cannot be referenced from a static context error. In the above code, we have to address the non-static variable with the object name. In a simple way, we have to create an object of the class to refer to a non-static variable from a static context.
And if no class instance is created, the non-static variable is never initialized and there is no value to reference. For the same reasons, a non-static method cannot be referenced from a static context, either, as the compiler cannot tell which particular object the non-static member belongs to.
Of course, they can but the opposite is not true i.e. you cannot access a non-static member from a static context i.e. static method. The only way to access a non-static variable from a static method is by creating an object of the class the variable belongs.
You cannot assign the result of a non-static method to a static variable. Instead, you would need to convert the getIPZip method to be a static method of your MyProps class, then you could assign its result to yor IPZip variable like this.
All member fields of an interface are by default public, static and final.
Since inner interface is static by default, you can't refer to T from static fields or methods.
Because T is actually associated with an instance of a class, if it were associated with a static field or method which is associated with class then it wouldn't make any sense
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