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Java %(mod) with float and double

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authera last edited by

How can the balance of the two separations be obtained float or double primitives? If I use a standard function %(mod) She's been working incorrectly from time to time (because of the specifics of the floating point, the mantis is missing), but I need accurate results. Is there such a function in the java bag?
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Saumya last edited by
If you do, d % 0.1 == 0.00000000001 - it's not the operator's fault. %a comparison operator. You can never compare numbers with a floating point to strict equality!
That's how it works.
```
if (d % 0.1 < eps || d % 0.1 > 0.1 - eps) ...
```
Here. eps - it's the absolute precision you need. For example, 0.00001
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You can read content-length from Response Header to get this information:response.getHeader("content-length"); This information corresponds to the size of the compressed response (if applicable) by means of Gzip 1. Then a response with size of 25 KB may have, uncompressed, more than 120 KB.1: You can check if you have gzip enabled by reading the reponse header content-encoding.
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There are several methods to launch a battery of processes in the background and wait for them to end.One of the solutions could be to analyze the content of the HashMap that receive the data to find out when they have reached the number of expected items, but career conditions could occur that would prevent the latter from updating the database, or that the latter would make multiple updates.Another very simple solution could be to make use of https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicInteger.html .This class allows you to manage an integer that can be modified easily by controlling properly https://es.wikipedia.org/wiki/Computaci%C3%B3n_concurrente .To start, you could define a class-level property for it:public class database { /* ... */ public ArrayList<combinacion> array = new ArrayList<>(); AtomicInteger procesos = new AtomicInteger(); After that it is enough to increase its content in one each time we make a request and decrease it in one each time we finish a task.The important part is to decrease the content and for that we are provided a method that allows us to modify and obtain the current value.We could modify the code in the following way to manage the number of processes that are pending completion of your work:public static void count1(String num, int n, RetrollamadaContInterface retrollamada) { /* Incrementamos en uno las tareas que quedarán en segundo plano */ Log.v("CONCURRENCIA", "(+) Procesos: " + procesos.incrementAndGet()); db.collection("combinaciones") .whereEqualTo(num, n) .get() .addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() { @Override public void onComplete(@NonNull Task<QuerySnapshot> task) { Map<String, Object> comb = new HashMap<>(); if (task.isSuccessful()) { int cont = 0; for (QueryDocumentSnapshot document : task.getResult()) { contador = document.getData(); cont++;//devolver esta variable } retrollamada.onContObtenido(cont); } else { Log.w(TAG, "Error getting documents.", task.getException()); } /* Decrementamos el número de procesos en segundo plano */ int numero = procesos.decrementAndGet(); Log.v("CONCURRENCIA", "(-) Procesos: " + numero); /* Si era el último, actualizamos la base de datos */ if (numero == 0) { actualizaBd(); } } }); } In this way every beginning of the query, BEFORE the query adds one to the content of the query procesos and each finalization of the consultation will be subtracting one to the content procesos, after having called the rear call, so that when said counter arrives 0 it is considered that there is no pending process, which is the time to update the database.As we have delegated the writing in the database to the completion of the processes in the background, we should call only to actualizarCombiAJugar() within the method readData().PD: Note that I decrease the value of procesos whether or not the consultation has been completed (task.isSuccessful()).You should manage the case that one of them fails to repeat it or cancel the database update. A simple way to cancel the database update in this case could be to assign a negative value to procesos with procesos.set(-1).This way I would never get to 0 and, therefore, he would never call himself actualizaBd() when the rest of the consultations are completed.

Java %(mod) with float and double

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