Menu
Can an interface hold any instance variables? In my instructor's specs, it says no instance variables are allowed in interface. But I've researched and some say that it can only contain final instance variable. If it can hold a final instance variable, so what role can that variable play at all in an interface?
990
No interface cannot have instance variable.
2.1.In an interface, we're allowed to use: constants variables. abstract methods. static methods.
The interface contains the static final variables. The variables defined in an interface can not be modified by the class that implements the interface, but it may use as it defined in the interface. 🔔 The variable in an interface is public, static, and final by default.
No, you cannot instantiate an interface. Generally, it contains abstract methods (except default and static methods introduced in Java8), which are incomplete. Still if you try to instantiate an interface, a compile time error will be generated saying “MyInterface is abstract; cannot be instantiated”.
variables declared in interface are by default public, static and final. Since it is static you cannot call it instance variable.
116
Variables which declared in interface are by default public, static and final.
These are static so you cannot call it as instance variable.
4
By default interface variables will always be public static final whether you mention these modifiers or not while defining variables. So, you can never have an instance variable in an interface.
2
Variables declared in an interface are by default public, static and final by default. So you can use interfaces to define constants.
You can read more about this Here
1
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
