Java: [Global method access] enum with a single instance vs on-demand object construction vs static

java,static,enums,object-reference,object-construction

I found an answer here to why creating a globally accessible pattern is bad instead of passing around references. Excerpt: They are generally used as a global instance, why is that so bad? Because you hide the dependencies of your application in your code, instead of exposing them through the...

Swift: Protocol Based Type Construction

swift,protocols,object-construction

If you want the exact same behavior of next I would suggest to do this: class Constructor { // store closures var callbacks: [[String] -> ()] = [] func construct<T:Model>(type:T.Type, callback: T -> ()) { callback(type(values: ["value1", "value2"])) } func queueRequest<T:Model>(request: Request<T>) { // some code from the next function...

Does the JVM internally instantiate an object for an abstract class?

java,abstract-class,object-construction

Is it true that you can't instantiate abstract class? Yes. Is JVM internally create object of abstract class ? No, but it's a common misunderstanding (and that wouldn't be an unreasonable way for it to be done; prototypical languages like JavaScript do it that way). The JVM creates one...