Java program to create enum class

Java Examples Comprehensive

In this example, we will learn how to create an enum class in Java.

To understand this example, you should understand the followingJava ProgrammingTopic:

• Java Enum

Example1: Create Java enum class program

enum Size{
　　//enumeration constants
　　SMALL, MEDIUM, LARGE, EXTRALARGE;
　　public String getSize() {
　　//reference object　
　　switch(this) {
　　　　case SMALL:
　　　　　　return "small";
　　　　case MEDIUM:
　　　　　　return "medium";
　　　　case LARGE:
　　　　　　return "large";
　　　　case EXTRALARGE:
　　　　　　return "extra large";
　　　　default:
　　　　　　return null;
　　　　　}
　　}
　　public static void main(String[] args) {
　　　　　//calling method getSize()
　　　　　//Using object SMALL
　　　　　System.out.println("The size of the pizza I got is ");　+　Size.SMALL.getSize());
　　　　　//calling method getSize()
　　　　　//Using object LARGE
　　　　　System.out.println("The size of the pizza I want is ");　+　Size.LARGE.getSize());
　　}
}

Output Result

The size of the pizza I got is small
The size of the pizza I want is large

In the above example, we created an enumeration class named Size. This class contains four constants SMALL, MEDIUM, LARGE, and EXTRALARGE.

In this case, the compiler automatically converts all constants of the enumeration to its instances. Therefore, we can use constants as objects to call this method.

Size.SMALL.getSize()

In this call, the this keyword is now associated with the SMALL object. Therefore, the small value is returned.

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