How to invoke classes in Java?

In Java, classes can be invoked in the following ways:

1. Create an object of a class and invoke its methods.
2. Create a new instance of ClassName and call its methodName.
3. Invoke a static method of a class.
4. Invoke the methodName in the ClassName.
5. Accessing a class’s static variable:
6. Access the variable from the ClassName.
7. Invoking a class’s methods or accessing a class’s fields through reflection mechanism.
8. Instantiate a class by its name, create an object of that class, obtain a method by its name, and then invoke that method on the object.

It is important to note that in order to call a class’s non-static method or access non-static fields, you must first create an object of the class. As for static methods and variables, they can be directly accessed using the class name.