... demonstrate how reference variables can be created, used, and destroyed. Releasing Reference Variables After you assign a reference to a new object, the reference variable will continue to reference ... with object variables. ) 6 Module 8: Using Reference- Type Variables Invalid References If you have invalid references You cannot access members or variables Invalid references at ... 4 Module 8: Using Reference- Type Variables Declaring and Releasing Reference Variables Declaring reference variables coordinate c1; c1 = new coordinate();...