If the object returned is not null, we can set the name in the User1 class by calling the setter method of the class and passing a custom string as a parameter to it. ![]() Now we check if the instance of the User1 class returned by the method is null or not by using the = operator in the if-else condition. In the main method, we create an object of the User2 class named user and call the getUser1Object() on it, which returns the instance of the class User1. The User2 class has one method, getUser1Object, which returns the instance of class User1. In this case, you would have multiple children classes of: public interface FooBarFunction extends Function.Reflection allows programmatic access to information about the fields, methods and constructors of loaded classes, and the use of reflected fields, methods, and constructors to operate on their underlying counterparts, within security restrictions. For that and other more complex cases, take a peek into Springs ReflectionUtils class. Java Reflection provides classes and interfaces for obtaining reflective information about classes and objects. Alas, it seems private fields can not be read in this fashion. The class User1 has one instance variable name and the Getter and Setter methods to update and retrieve the instance variable name. Of course, avoiding reflection altogether is by far the best approach, but when it is required, this is a nice way not to have to deal with the ugly reflection code directly. Java Check if Object Is Null Using the = OperatorĪs an example, we have created two classes - User1 and User2. ![]() This tutorial will go through the methods to check if an object is null in Java with some briefly explained examples.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |