[Java] How do you declare an object’s reference variable?

Objects are accessed via objects' reference variables,which contain references to the objects. The syntax to declare a reference variable for an object is

ClassName objectRefVar;

 A class is a reference type, which means that a variable of the class type can reference an unstance of the class. The variable myCircle can reference a Circle object. The next statement creates an object and assigns its reference to myCircle:

   myCircle = new Circle();

You can write a single statement that combines the declaration of an object reference variable,the creation of an object, and the assigning of an object reference to the variable with the following syntax:

    ClassName objectRefVar = new ClassName();

Here is an example:

    Circle myCircle = new Circle();

The variable myCircle holds a reference to a Circle object.

Remarks
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Reference:
Introduction to Java programming, Y. Daniel Liang, 10th edition (P.333)