The lessons so far have discussed creating classes, which are templates for creating objects. In the same lesson, the process of creating and using the objects themselves will be described.
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In the Java language, a variable can never store an object. Instead, Java has references that point to the location of an object in memory.
The syntax for creating a variable of type object reference is as follows:
<Class name> <variable name>;
It is worth noting that we immediately indicate the class whose objects will be referenced.
Example: a variable named "b" pointing to the Book class:
Book b;
In the same way, you can create class fields (you can add an access modifier there). You can create arrays of references and return them from methods. Example:
public class Libary {
public Book[] books;
public Book findBookWithName(String name) {
//code that finds the right book
}
};
Conclusion: in many ways, you can work with references in the same way as with variables of other elementary types (int, long, double...).