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W3schools - Enum

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enums

enum(enumerations) is a special class that represents a group of constants

To create enum use the “enum” keyword, and weparate the constants with a comma,

they should be in uppercase letters

public class Main{	// can have enum inside a class
	enum Level{
	LOW,
	MEDIUM,
	HIGH
}
	public static void main(String[] args){
		Level myVar = Level.MEDIUM;	// Can access enum constants with the dot syntax
		System.out.print(myVar);	// output MEDIUM

		switch(myVar){	// are often used in “switch“ to check for corresponding values
		case LOW:
			System.out.println(“Low level”);
			break;
		case MEDIUM:
			System.out.println(“Medium level”);	// output Medium level
			break;
		default:
			System.out.println(“High level”);
			break;
		for(Level myVar : Level.values()){
		// enum has a values() method, which returns an array of all enum constants
			System.out.println(myVar);
		}
	}
}

Difference between Enums and Classes

enum can, just like a class, have attributes and methods

only difference is that enum constants are public static, and final

so, use enum when you have values that aren’t going to change