![]() In this sample code, the variable dice is the integer 20, representing the maximum possible die roll (a 20-sided die cannot roll more than 20). Knowing that you play a lot of Dungeons and Dragons, you decide to create a 20-sided die. Suppose you're writing a simple Java dice-roller application because you want to produce a pseudo-random number for a game.įirst, you might create your dice class to represent a physical die. For the sake of demonstration, though, ignore the hidden constructor that Java provides (because a default constructor adds no extra features), and take a look at life without an explicit constructor. ![]() All classes in Java have a constructor because even if you haven't created one, Java does it for you when the code is compiled. If you're writing Java code, you're already using constructors, even though you may not know it. That's a lot of technical terms crammed into a few sentences, but it becomes clearer when you see it in action, so make sure you have Java installed and get ready for a demo. ![]() If a constructor exists, Java runs the code in the constructor while creating the instance. When your Java application creates an instance of a class you have written, it checks for a constructor. Put succinctly: a constructor is an action performed upon the creation of a new object in Java. One of the most common questions about Java relates to constructors: What are they and what are they used for? Of course, Java is also a pretty complex language with subtleties and conventions all its own. ![]() While there are many great cross-platform frameworks, few are as unified and direct as Java. Java is (disputably) the undisputed heavyweight in open source, cross-platform programming. ![]()
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