Interface variables are static and final by default in Java, Why?
An interface defines a protocol of behavior and not how we should be implemented.
A class that implements an interface adheres to the protocol defined by that interface.
- Interface variables are static because java interfaces cannot be instantiated on their own. 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. In other words, interfaces can declare only constants, not instance variables.
// Any number of final, static variables
datatype variableName = value;
// Any number of abstract method declarations
returntype methodName(list of parameters or no parameters);
Published on 23-May-2019 18:42:25