What does an interface contain? – McqOptions

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1.	What does an interface contain?
A.	Method definition
B.	Method declaration
C.	Method declaration and definition
D.	Method name
E.
Answer» C. Method declaration and definition

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What does an interface contain?
interface calculate{ void cal(int item);}class display implements calculate{ int x; public void cal(int item) { x = item * item; }}class Main{ public static void main(String args[]) { display arr = new display(); arr.x = 0; arr.cal(2); System.out.print(arr.x); }}8.All methods must be implemented of an interface.