Can enum have constructor in Java?

Can enum have constructor in Java?

enum can contain constructor and it is executed separately for each enum constant at the time of enum class loading. We can’t create enum objects explicitly and hence we can’t invoke enum constructor directly.

Can we create constructor in enum?

Enum in Java contains fixed constant values. So, there is no reason in having a public or protected constructor as you cannot create an enum instance. Also, note that the internally enum is converted to class. As we can’t create enum objects explicitly, hence we can’t call the enum constructor directly.

How do you call an enum constructor?

However, we can use enum constants to call the constructor. In the Main class, we assigned SMALL to an enum variable size . The constant SMALL then calls the constructor Size with string as an argument. Finally, we called getSize() using size .

Why is enum constructor private?

You cannot actually have a public enum constructor. You need this constructor to be private, because enums define a finite set of values (for example EN_US, EN_UK, FR_FR, FR_BE). If the constructor was public people could potentially create more values (for example invalid/undeclared values such as XX_KK, etc).

Is enum constructor private?

The enum constructor must be private . You cannot use public or protected constructors for a Java enum . If you do not specify an access modifier the enum constructor it will be implicitly private .

Can we inherit enum in Java?

Inheritance Is Not Allowed for Enums. Now, let’s find out why we got our compiler error. When we compile an enum, the Java compiler does some magic to it: It turns the enum into a subclass of the abstract class java.

What is the use of enum constructor?

The enum constructor sets the int field. When the constant enum values are defined, an int value is passed to the enum constructor. The enum constructor must be private . You cannot use public or protected constructors for a Java enum .

What is type-safe enum?

The enums are type-safe means that an enum has its own namespace, we can’t assign any other value other than specified in enum constants. Additionally, an enum is a reference type, which means that it behaves more like a class or an interface.