The instance initialiser is just syntactic sugar in this case, right? I don’t see why you need an extra anonymous class just to initialize. And it won’t work if the class being created is final. You can create an immutable map using a static initialiser too: public class Test { private static final Map<Integer, String> … Read more
All Versions In case you happen to need just a single entry: There is Collections.singletonMap(“key”, “value”). For Java Version 9 or higher: Yes, this is possible now. In Java 9 a couple of factory methods have been added that simplify the creation of maps : // this works for up to 10 elements: Map<String, String> … Read more
You want the typeof operator. Specifically: if (typeof variable !== ‘undefined’) { // the variable is defined }
It would be simpler if you were to just declare it as a List – does it have to be an ArrayList? List<String> places = Arrays.asList(“Buenos Aires”, “Córdoba”, “La Plata”); Or if you have only one element: List<String> places = Collections.singletonList(“Buenos Aires”); This would mean that places is immutable (trying to change it will cause … Read more