将单个元素传递给接受集合的方法

Question

There is a method that accepts a collection. I need to pass a single element to that method. What is the best way to do this? Which implementation of collection should I use?

Answer 1

java.util.Collections.singleton()

Answer 2

As per my understanding, you have a method like this:

public void someMethod(Collection c)

and you need to pass a single element to it(say MyObject).

There are two options here:

1. Create a List, add MyObject to it and then pass the List to method.

2. If possible, use polymorphism! - Create a new method with MyObject as parameter:

   public void someMethod(MyObject obj);