Objects in Java

                         Objects in Java

In general sense an Object is any physical or conceptual thing that we find around us. If we look around we will see many examples of real-world objects: your classmate, your table, your television etc.

The above three objects mentioned share similar characteristics. 

They all have identity, state and behavior.

 For example your dog has state (name, color, breed) and behavior (barking, fetching and wagging tail).

Identity is the name given to an object, like name given to a dog.

So when you create a class and create an object of that class the object will be having access to the members or fields of that class and we access the members of that class by using the object.

Imagine the Object of  a class as an agent of that class. Whenever you need to access the members of that class you need to do it through the agent (in our case the Object) we created for that class.

Consider a sample program below.

Carefully note that I have creates two different classes; SampleClass and SampleObject.

I have declared the values of a,b and c in the class SampleClass.

Now suppose I need to access these members from other class so I will create a class names SampleObject.

The next thing I do is creating the object of that class whose members I need to access. In our case it is SampleClass and the members that I need to access are a,b,c.

Syntax for

creation of Objects using the “new“ keyword.

Here we shall learn how to create an object of a particular class.

The general syntax is given below.

 

By using the above syntax mentioned we can create the object for class SampleClass as below.

          SampleClass  obj = new SampleClass();

The above statement will define an object named “obj” and by using this object we access the members of class SampleClass.

In nest post we shall discuss the role of "new" keyword and some examples of object creation.

Bye! Keep visiting.