Java method reference

Question

I've some class with these methods:

public class TestClass
{

    public void method1()
    {
        // this method will be used for consuming MyClass1
    }

    public void method2()
    {
        // this method will be used for consuming MyClass2
    }
}

and classes:

public class MyClass1
{
}

public class MyClass2
{
}

and I want HashMap<Class<?>, "question"> where I would store (key: class, value: method) pairs like this ( class "type" is associated with method )

hashmp.add(Myclass1.class, "question");

and I want to know how to add method references to HashMap (replace "question").

p.s. I've come from C# where I simply write Dictionary<Type, Action> :)

Answer 1

Now that Java 8 is out I thought I'd update this question with how to do this in Java 8.

package com.sandbox;

import java.util.HashMap;
import java.util.Map;

public class Sandbox {
    public static void main(String[] args) {
        Map<Class, Runnable> dict = new HashMap<>();

        MyClass1 myClass1 = new MyClass1();
        dict.put(MyClass1.class, myClass1::sideEffects);

        MyClass2 myClass2 = new MyClass2();
        dict.put(MyClass2.class, myClass2::sideEffects);

        for (Map.Entry<Class, Runnable> classRunnableEntry : dict.entrySet()) {
            System.out.println("Running a method from " + classRunnableEntry.getKey().getName());
            classRunnableEntry.getValue().run();
        }
    }

    public static class MyClass1 {
        public void sideEffects() {
            System.out.println("MyClass1");
        }
    }

    public static class MyClass2 {
        public void sideEffects() {
            System.out.println("MyClass2");
        }
    }

}