Therefore, in order for us to run this Employee class there should be a main method and objects should be created. It’s common to use reference variables to refer to a more specific type. It's not a hard-and-fast rule.

* you can identify type of any object by three ways i..e by using instanceof, * getClass() and isInstance() method of java.lang.Class. //creating instance of sub class and storing into type of superclass//determining type of object in Java using instanceof keyword"Checking type of object in Java using instanceof ==>"//determining type of object in Java using getClass() method"Checking type of object in Java using  getClass() ==>"//determining type of object in Java using isInstance() method//isInstance() is similar to instanceof operator and returns true even"Checking type of object in Java using  isInstance() ==>" also consider sub type object as of Super Type. His background includes design and implementation of business solutions on client/server, Web, and enterprise platforms. A class can have more than one constructor.As mentioned previously, a class provides the blueprints for objects.

Now, save this source file with the name Employee.java.The Employee class has four instance variables - name, age, designation and salary. * * @author Javarevisited */ public class … The main rule of constructors is that they should have the same name as the class. Import statement is a way of giving the proper location for the compiler to find that particular class.For example, the following line would ask the compiler to load all the classes available in directory java_installation/java/io −For our case study, we will be creating two classes.

Note that all arrays are considered to implement the interface Cloneable and that the return type of the clone method of an array type T[] is T[] where T is any reference or primitive type. It is not possible to declare different import and/or package statements to different classes in the source file.Classes have several access levels and there are different types of classes; abstract classes, final classes, etc.
Therefore the Object class methods are available to all Java classes.

Only method returns strict type identification result and does not consider sub class object as of Super class. Blog about Java, Programming, Spring, Hibernate, Interview Questions, Books and Online Course Recommendations from Udemy, Pluralsight, Coursera, etc You're testing simpleRule, which you define as a business rule. As much as possible, this should be replaced by something more object-oriented. A class can have more than one constructor.As mentioned previously, a class provides the blueprints for objects.

As a language that has the Object-Oriented feature, Java supports the following fundamental concepts − Let us now look deep into what are objects. Java is an Object-Oriented Language. Stephen has a degree in Computer Science and Physics from Florida State University.Webucator provides instructor-led training to students throughout the US and Canada. Object class is present in java.lang package. If a Class does not extend any other class then it is direct child class of Object and if extends other class then it is an indirectly derived. If we do not explicitly write a constructor for a class, the Java compiler builds a default constructor for that class.Each time a new object is created, at least one constructor will be invoked. Java is an Object-Oriented Language. You have a typo that makes your output all wrong. Java is an Object-Oriented Language. Now, save this source file with the name Employee.java.The Employee class has four instance variables - name, age, designation and salary.