public: for the accessibility across all the classes, just like the methods present in the interface
static: as interface cannot have an object, the interfaceName.variableName can be used to reference it or directly the variableName in the class implementing it.
final: to make them constants. If 2 classes implement the same interface and you give both of them the right to change the value, conflict will occur in the current value of the var, which is why only one time initialization is permitted.
Also all these modifiers are implicit for an interface, you dont really need to specify any of them.
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