Question

Is it posible to store functions in an array in java?
Like for example..

public void getMyname(){

// do something here;

}

public void getLastname(){

//do something here;
}

Array arr = {getLastName,getMyname};

Like that? if so is it right?

Answer 1

You can’t store methods in arrays in Java, because methods aren’t first-class objects in Java. It’s a reason some people prefer to use other languages like Python, Scheme, etc.

The work-around is to create an interface which contains one method, then create four classes implementing that interface – the MoveRight, MoveLeft, etc… classes. Then you can store instances of those classes in your array and call them all the same way.

public enum Level1 implements Explorable{
    ROOM1 {
        public void explore() {
            // fight monster
        }
    }, ROOM2 {
        public void explore() {
            // solve riddle
        }
    }, ROOM3 {
        public void explore() {
            // rescue maiden
        }
    };

}

public interface Explorable{
    public abstract void explore();    
}

public static void move(Explorable[] adjacentNodes, int index)
{
    adjacentNodes[index].explore();
}