Enumerations serve the purpose of representing a group of named constants in a programming language. Enums are used when we know all possible values at compile-time, such as choices on a menu, rounding modes, command-line flags, etc. It is not necessary that the set of constants in an enum type stay fixed for all time. In Java, enums are represented using enum data type. Java enums are more powerful than C/C++ enums. In Java, we can also add variables, methods, and constructors to it. The main objective of enum is to define our own data types(Enumerated Data Types).
Note: Instance variables are non-static variables and are declared in a class outside any method, constructor, or block.
Now coming to our problem description as it is to illustrate how to use enum Constructor, Instance Variable & Method in Java. So, for this solution, we will see the below example initializes enum using a constructor & totalPrice() method & displays values of enums.
Example
Java
// Java program to Illustrate Usage of Enum// Constructor, Instance Variable & Method// Importing required classesimport java.io.*;import java.util.*;// Enumenum fruits { // Attributes associated to enum Apple(120), Kiwi(60), Banana(20), Orange(80); // internal data private int price; // Constructor fruits(int pr) { price = pr; } // Method int totalPrice() { return price; }}// Main classclass GFG { // main driver method public static void main(String[] args) { // Print statement System.out.println("Total price of fruits : "); // Iterating using enhanced for each loop for (fruits f : fruits.values()) // Print anddispaly the cost and perkg cost of // fruits System.out.println(f + " costs " + f.totalPrice() + " rupees per kg."); }} |
Total price of fruits : Apple costs 120 rupees per kg. Kiwi costs 60 rupees per kg. Banana costs 20 rupees per kg. Orange costs 80 rupees per kg.
