Java - splitting work to multiple threads

Question

I am posed with the following problem: I need to split work across multiple threads for perfomance reasons, but I am not sure what approach to take.

Firstly, the tas

Answer 1

I shall add a proposal that is in my eyes more elegant than creating a whole new class for your parametrized Callable. My solution is a method that returns a Callable instance:

Callable expensive(final String param) {
  return new Callable() { public String call() { 
    return expensiveMethod(param);
  }};
}

This even makes client code more palatable:

final Future f1 = executor.submit(expensive("param1"));