Java equivalent of function mapping in Python

Question

In python, if I have a few functions that I would like to call based on an input, i can do this:

lookup = {\'function1\':function1, \'function2\':function2, \'fu         


        

Answer 1

Java doesn't have first-class methods, so the command pattern is your friend...

disclamer: code not tested!

public interface Command 
{
    void invoke();
}

Map commands = new HashMap();
commands.put("function1", new Command() 
{
    public void invoke() { System.out.println("hello world"); }
});

commands.get("function1").invoke();