Java – how to share a constant variable for all classes in the package?

I want a constant variable to be common to all classes in the package Is there any way I can do this instead of using only one of them to define the interface and make each class implement it?

Solution

In Java, all constants must reside in a type (class or interface) However, you do not have to implement interfaces to use constants declared internally

You can try to add something like this to your bag:

interface Constants {

    static final String CONSTANT = "CONTANT";

}

Then use it like this:

String myVar = Constants.CONSTANT;

In this way, you still have your interface, but no class implements it