
Explanation of Solution
Reference variable:
Whenever an object is assigned to a variable or passing an object to a method as an argument, it does not mean copies of the object are used. Instead, we use the references to those objects which mean reference is the address that is used to indicate where the object’s variables and methods are stored.
Example:
//Class definition
public class Student {
// field or data member or instance variable
int id;
String name;
//Main definition
public static void main(String args[...
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