Why are interface variables static and final by default?

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In this example, We have shared Why are interface variables static and final by default? Interface variables are static because Java interfaces cannot be instantiated in their own right; the value of the variable must be assigned in a static context in which no instance exists. The final modifier ensures the value assigned to the interface variable is a true constant that cannot be re-assigned by program code.

The reason behind the interface fields automatically becoming final (constant) is to prevent different implementations accidentally changing the value of interface variable which can inadvertently affect the behavior of the other implementations. Imagine the scenario below where an interface property did not explicitly become final by Java:

Now, just think what would happen if another class that implements Actionable alters the state of the interface variable:


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