Maps : In Java Maps can I assign a function to the value in the <K,V> pair? [duplicate]

Question

I have a set of string which I will be using as the Keys and for a particular string I want a function to be called. So is it possible to assign a function to the value in the pair?

exampleMap.get("SOME_STRING"); // should call a function abc();

Answer 1

Encapsulate your function in a Java interface:

public interface Task {
    void doSomething();
}

and then pouplate the map with instances of this interface:

map.put("someString", new Task() {
    @Override
    public void doSomething() {
        System.out.println("foo");
    }
});
map.put("someOtherString", new Task() {
    @Override
    public void doSomething() {
        System.out.println("bar");
    }
});

Then to call the function (task) associated with a given string s:

map.get(s).doSomething();

Answer 2

No, java does not support any method objects yet. You could use reflection or try to replace your strings with enum constants and call the method on them.