Big idea: Encapsulation A form of abstraction Interface: Public data Public methods Javadoc comments Implementation: Private instance variables Private constants Private methods Bodies of public methods Solution Encapsulation is a concept of OOP (Object Oriented Programming). It is a method of wrapping the variables and methods together in a single unit. In the scenario of encapsulation, the variables of the class will be hidden from other classes (using private variables) and can only be accessed through the methods of current class. Encapsulation is achieved by (i) Declaring the variables of a class as Private (ii) Providing public functions/methods to modify the variable values Example: public class Encapsulation{ private int money; public int getMoney() { return money; } } In the above example, the variable \"money\" is private and cannot be accessed by other classes publicly. If they want to access the variable or get the value of the variable, a public function needs to be present. Only in such a case, they can access the variable..