Why are interface variables in Java static and final by default?

An interface defines a protocol of behavior and not how we should be implemented. A class that implements an interface follows the protocol defined by the interface.

• Interface variables are static because Java interfaces cannot be instantiated individually. The value of the variable must be assigned in a static context where no instance exists.
• The final modifier ensures that the value assigned to the interface variable is a true constant cannot be re-assigned. In other words, interfaces can declare only constants, not instance variables.

Template :

interface interfaceName{
   // Any number of final, static variables
   datatype variableName = value;
   // Any number of abstract method declarations
   returntype methodName(list of parameters or no parameters);
}

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