How can I check if an element exists in a Set of items?

Question

In an if statement in Java how can I check whether an object exists in a set of items. E.g. In this scenario i need to validate that the fruit will be an apple, ora

Answer 1

Is Arrays.binarySearch what you are looking for?

String [] fruits = new String[]{"APPLE", "ORANGES", "GRAPES"};
Arrays.sort(fruits); // binarySearch requires that the array is sorted

if (Arrays.binarySearch(fruits), fruitname) >= 0) {
  // found!
}

And of course the trusted Apache Commons ArrayUtils:

if (ArrayUtils.contains(new String[]{"APPLE", "ORANGES", "GRAPES"}, fruitname){
  // found
}

I knew there would be something in Apache Commons :)