How to create list filled with methods in Java and iterate over it (using methods)

Question

I want to be able to create list (collection, array) filled with my own methods and in each step of iteration call the method. What's the best solution for this?

I want something like this:

List a = new List();
a.add(myCustomMethod1());
a.add(myCustomMethod2());

Object o = new Object();

for (Method m : a){
    m(o);
}

Answer 1

In Java, you can do this with reflection by making a list of Method objects. However, an easier way is to define an interface for objects that have a method that takes an Object argument:

public interface MethodRunner {
    public void run(Object arg);
}

List<MethodRunner> a = new ArrayList<>();
a.add(new MethodRunner() {
    @Override
    public void run(Object arg) {
        myCustomMethod1(arg);
    }
});
a.add(new MethodRunner() {
    @Override
    public void run(Object arg) {
        myCustomMethod2(arg);
    }
});

Object o = new Object();

for (MethodRunner mr : a) {
    mr.run(o);
}