Variables: There can be three types of variables in java. 1. Instance Variables : These are Non-Static Fields. Individual states of objects are stored in Instance variables. These are declared without the static keyword. For number of objects created from a class all objects use same copy of instance variable. Example: import java.io.*; class Student{ // this instance variable is visible for any child class. public String name; // percentage variable is visible in Student class only. private double percentage; // The name variable is assigned in the constructor. public Student (String StudName){ name = StudName; } // The percentage variable is assigned a value. public void setPe...