Question

Which of the following are valid functional interface ? Select one or more: @FunctionalInterface interface Test { public void calculate(int a,int b,char oper); public default void display(){ System.out.println("default method"); } } @FunctionalInterface interface Test { int a=10; public void display(); } @FunctionalInterface interface Test { public void display(); } @FunctionalInterface interface Test { public void display(); public char getInput(); }​

Answer 1

Answer:

Valids are

@FunctionalInterface

interface Test

{

public void calculate(int a,int b,char oper);

public default void display(){

System.out.println("default method");

}

}

and

@FunctionalInterface

interface Test

{

public void display();

}

Explanation: