Java: Java Programming For Beginners a simple Start To Java Programming (Written By a software Engineer)

Reference Data Types
Reference  variables  are  made  utilizing  characterized  constructors  of  the  classes.
They  are  utilized  to  get  to  objects.  These  variables  are  proclaimed  to  be  of  a
particular data type that can’t be changed. A few examples of such data types are
Employee and Dog.
Class objects, and different kind of variables go under reference data type.
Default estimation of any reference variable is invalid.

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A reference variable can be utilized to allude to any object of the announced sort.
Example: myanimal = new Animals(“rabbit”);