2020-02-16 19:55 In reading the Sun Certified Java Essentials link from the Programmer Certification forum, I wondered if there was a case where you would want to instantiate a static nested class instead of just referencing it. For example, I have created an instance of the nested class below as well as a reference variable.
Static classes are basically a way of grouping classes together in Java. Java doesn't allow you to create toplevel static classes; only nested (inner) static classes. Let's take a look at an example. Here's a class called CarParts that declares a static inner class called Wheel. CarParts. java: java instantiating static class
Learn about Java static fields, static methods, static blocks and static inner classes. If nested class doesnt require any access to its enclosing class instance members, then its better to declare it as static because this way,
How to instantiate an object in java? you don't need to explicitly instantiate anything as when you run the compiled code JAVA automatically creates an instance of your class and looks for main() define it as a class. In your case, the method is not static is so you cannot directly access it from the Static method Main. Make it static java instantiating static class
The answer is YES, we can have static class in java. In java, we have static instance variables as well as static methods and also static block. Classes can also be made static in Java. Most likely you just want to make your inner class static. Nonstatic members of a class (variables, methods, inner classes) are per instance of the class. Therefore, when accessing nonstatic members from a static context (such as a static method like you need to specify an instance of the enclosing class. His solution allows you to instantiate inner classes from within a static method, such as a main() of the same class. Otherwise, you can't instantiate an inner class within a static method. It does not compile. java instantiating static class As per my understanding based on static class, we cannot instantiate object of static class. Your understanding of the meaning of static class is incorrect. Basically a static class in Java is a nested class which doesn't have an implicit reference to an instance of the containing class. A static nested class is a class within a class, in which the outer class can access static members of the nested class. In order to create an instance of the nested class, you need to reference Sep 19, 2018 1. Only nested classes can be static in JAVA. 2. A static class is created inside a class. 3. So, all the static classes are nested classes. 4. Static classes can access only static members, static variables and static methods from outer class. 5. Non static variables and instance methods can not be accessible inside a static class. Java static nested class. A static class i. e. created inside a class is called static nested class in java. It cannot access nonstatic data members and methods. It can be accessed by outer class name. It can access static data members of outer class including private. Static nested class cannot access nonstatic (instance) data member or method.
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