What is the point of finding info from the class?

Currently, at school, I learn about how to get information about an object. This has to do with polymorphism. You can rotate all objects in a polymorphic table, unless it's a circle.
Class c = Class.forName("Circle");
System.out.println(c.getName());
System.out.println(c.getSimpleName());
System.out.println(c.getCanonicalName());
System.out.println(c.isInterface());
System.out.println(c.getSuperclass());
This will give you information about a class. With the help of class class can create a ClassNotFound exception and is generally more difficult to code. Wouldn't be better to just a method of id() with inside information. Using the method proposed by the manual, you need to create a class for each shape reference. What happens if you have a lot of forms, then it is a waste of memory to create all these objects? If you created an id() method in the base class that should be replaced by the subclasses, then simply call a method. Otherwise, you will need to create a class object for another object.

Isn't it more easy and less complicated then the code above? This will not cause a runtime error.
System.out.println(circle.id());
Why use a class better than simply create object and id() method in all classes?

Sometimes, you want to create a code that loads the classes during execution.

The compiler does not know about the class. If you need information on the class in a generic way.

This is not possible with your example because the compiler needs to know your class so that it can compile.

Tags: Java

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