Javascript Enum Tostring

Michael Zippo 04.11.2021

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A Java enumeration is a data type that stores a list of constants. You can create an ENUM object using the enum keyword. Enum constants appear in the form of a separate list by commas in a set of braces.

An enum, which is the abbreviation for enumeration, is a data type that has a fixed set of possible values.

Enumerations are useful if you are working with a value that should only contain a specific value contained in a list of values. For example, an ENUM would be used if you want to store a list of the sizes of coffee sold in a store.

This tutorial will cover the basics of enumeration in Java. We will refer to some examples of an ENUM class in a Java program to help you get started.

Java Enum Syntax

A Java ENUM represents a list of constants. A variable assigned by an enumeration can have only one value that appears in the enumeration. Enumerations help developers store data that they know will not change.

Suppose you decide that a Java variables store employee compensation degrees can only have one of five values. Or, decide that a variable that store employee contracts can only store part-time, full-time, or zero hours. In these cases, you need to use an ENUM to store the data.

enumerations are declared using "ENUM" kind. The syntax of "ENUM " word - key:

Let’s analyze this syntax:

ENUM indicates our program that we want to declare an enumeration .
name is the name of our ENUM.
VALUE1, VALUE2, VALUE3 are the set of constant values ‚Äã‚Äãthat our stores enum. These values ‚Äã‚Äãare usually written in upper case.

Why use Enum in Java?

Using ENUM allows you to express an algorithm in a way that is more readable both for you and for the computer.

Writing an ENUM tells the computer that a variable cannot have a specific number of values. It also tells you, the programmer, that this is the case, which will make your code easier to understand. If you see a variable that uses an ENUM, you know that the variable can only have one of a limited number of values ‚Äã‚Äã

In addition, the enumerations allow you to use constants more efficiently. in fact, ENUM was introduced to replace the int constants in Java, which spanned multiple lines and were difficult to read. Here is an example of an old int constant in Java:

Our code takes five lines to declare these constants. But by using an ENUM, we can reduce our code to three lines. In the following example, we declare a list of enum constants:

 AirplaneClasses class {Economy, FIRST_CLASS}

This code is simpler and easier to read.

Declaring Java Enum

We are creating an application that waiters can use to send coffee to baristas in a coffee shop.

When a barista enters a value for the size of the drink, we want there to be only three possible options. These options are: small, regular, and LARGE. We could use an ENUM to limit the possible sizes of a drink to these options:

In this example, we have declared an ENUM called Sizes which has three possible values. Now that we have declared an ENUM, we can refer to its values ‚Äã‚Äãin our code.

Java Enum Example

We write a program that prints the size of the coffee a customer has ordered from the console. This value will be read by the bartender preparing the customer’s drink

We could use the following code to print the size of the coffee a customer ordered on the console:

First, we declare an ENUM called Sizes. Power have three values: SMALL, REGULAR or LARGE. Next, we declared a class called PrintSize. This class accepts the customer’s drink size and prints the glass size to the console.

In our main program, we declare an object called order173, ‚" which uses the PrintSize class. We went through our code Java parameter Sizes.SMALL. This tells our program to assign the value SMALL to the coffeeSize variable in the PrintSize class.

Next, we use order173.placeOrder () to run the code in the switch case statement in the PrintSize class. This evaluates the variable value "coffeeSize" against three cases. A message is printed on the console based on the size of the coffee a customer has ordered.

We indicated that the customer ordered a small coffee. Our code impressions "This coffee should be weak." ¬ª on the console.

If you are looking to learn more about Java switch case statements, you can read them in our tutorial on the switch statement Java < / a>.

compareTo ()

compareTo () compares constants in a lexicographic ENUM and returns the difference between their ordinal values. Here is an example of compareTo () used with an ENUM value from our previous example:

Our code returns the difference between the SMALL and GRAND tags according to their value In this case , our code returns:

toString ()

toString () converts the name of an ENUM to a string Here is an example of toString () used to convert the ENUM LARGE value to a string:.

name ()

the name () method returns the name used to define a constant in an enum class. Here is an example of the name of the method () used to return the defined name of the regular coffee size:

Values ‚Äã‚Äã()

The values of the process yields (a) Java array that stores all the constants in an enum. Here’s an example of the values ‚Äã‚Äã() method in action:

valueOf ()

valueOf () accepts a string and returns the constant ENUM, which has the same name. So if we wanted to retrieve the constant enum with the name REGULAR, we could do it using this code:

Conclusion

A ENUM, short for enumeration, is a Java data type that has a fixed set of values.

Enumerations are useful if you are working with variables that should only be able to store one in a selected range of values.

After practicing what you have read in this tutorial, you will be an expert at using enumerations in Java. To learn more about coding in Java, see our complete guide How to code Java .

We hope this article has helped you to resolve the problem. Apart from Javascript Enum Tostring, check other __main__ Python module-related topics.